Bike theft is a rampant problem, but a quality bike lock can deter or thwart even the most determined bike thief. With dismal statistics surrounding bike theft, having the best bike lock is imperative to keep your precious ride(s) safe.

　　Fortunately, there are many great bike locks on the market that fit a variety of security needs and budgets. Our team of testers carefully tested and evaluated each of the locks in this guide to find the best options for every rider and bike theft risk scenario.

　　From the innovative, wearable Hiplok Gold chain lock or the angle grinder-resistant OnGuard RockSolid to the super portable Ottolock Original Cinch Lock and everything in between, weve got recommendations to suit your bike security needs. If you need help deciding what you need, check out ourbuyers guideand price value sections to determine what will serve you best. Or, to see all the models we tested at a glance, our comparison chart will show you the breakdown.

　　Editors Note: We updated this guide on October 23, 2024, with the addition of seven new models, including the super secure OnGuard RockSolid U-Lock and Beast Chain Lock, the Ottolock Sidekick and Sidekick XL U-Locks, and the folding Hiplok Switch.

　　The Best Bike Locks of 2024 Best Overall Bike Lock Chain: HipLok Gold Best Overall Bike Lock U-Lock: OnGuard RockSolid Best Budget Bike Lock: OnGuard Bulldog Best Folding Bike Lock: Hiplok Switch Best Bike Lock for Low-Risk Situations: Ottolock Original Cinch Lock Good Value U-Lock and Cable Combo: Kryptonite New-U Kryptolock Standard U-Lock with Cable Best High-Security Chain Lock: OnGuard Beast 8016L Best Overall Bike Lock Hiplok Gold Specs Lock style Chain Lock type Key Security level High Sold Secure rating Gold Dimensions 33.5 in. chain length Thickness 10 mm Weight 2,359 g (5.2 lbs.)

　　Pros Super-secure 10 mm chain lock Highly visible reflective sheath Waist carry option makes it more easily portable Cons Shorter length limits locking options Fairly expensive Paul Mandell Chain locks are considered by many to be the premier option for securing your bike, but they have a few drawbacks — specifically, chains are heavy and unwieldy and can be a real pain to bring with you everywhere. The Hiplok Gold ($130 to $140) solves this problem with an innovative carry option that keeps its 5.2-pound weight centered and secure around your waist — or slung over your shoulder — as you ride.

　　Hiplok designed this lock with a seatbelt-like clasp that adjusts to waists between 30 and 44 inches. This eliminates the need to size your chain according to your belt size and keeps the weight down. Additionally, the chain is wrapped in a durable and highly reflective nylon chain cover, which increases your safety and visibility as you ride, adds a bit of comfort when worn, and adds a barrier between the chain and your bike.  

　　The length of the Hiplok chain and shackle is 33.5 inches (85 cm), which is enough to lock a frame and wheel to a stand or pole, but it may be difficult to make larger-diameter objects such as trees work. The links measure in at 10 mm thick while the shackle is slightly thicker at 12 mm. and while this lock is not impervious to vandals, hooligans, and/or rapscallions sporting nefarious intent, it will absolutely slow down any would-be bike thief trying to opportunistically make off with your whip.

　　The Hiplok Gold has a Gold-level Sold Secure rating (able to withstand a 5-minute attack with hand tools) and a lifetime warranty. Its not impervious to angle grinders, so we wouldnt leave your bike locked out of sight or overnight in a high-risk area, but this conveniently portable chain lock is great the majority of the time.

　　While some folks may prefer a different style of lock or something that weighs a little less, we were very impressed with the Hiplok Gold for its combination of safety and security in a compact and innovatively portable (albeit slightly heavy) package, which is why it’s our top-rated bike lock.

　　$130 at REI$140 at Amazon Best Overall U-Lock OnGuard RockSolid 8590 Specs Lock style U-Lock Lock type Key Security level Very high Sold Secure rating Diamond Dimensions 3.55 in. x 6.9 in. Thickness 15 mm Weight 1,406 g (3.1 lbs.)

　　Pros Super secure diamond rating Angle grinder resistant Rubber coating protects bike finish Comes with 5 keys! Light for security level Cons Expensive Not the smoothest key feel Paul Mandell The OnGuard RockSolid is one of the latest angle grinder-resistant U-locks on the market. OnGuard has been making quality locks for a long time, but this is by far the burliest and most secure theyve ever produced. It gets our nod for the best U-lock for its quality construction, diamond-level Sold Secure rating, lighter weight, and more approachable price — compared to other angle grinder-resistant locks.

　　The not-so-secret behind the RockSolids angle grinder resistance is the addition of a 2mm thick diamond ceramic coating on the outside of the 15 mm thick hardened steel shackle. Cutting blades on angle grinders basically just bounce off and grind themselves down to nothing when trying to cut through it and saws and prying tools dont stand a chance either.

　　The shackle removes completely from the locking base which means that OnGuard was able to employ its X4P Quattro Bolt Locking Mechanism. The shackle locks at four points, so even if someone manages to cut one side, they still wont be able to turn it — it would require two full cuts to compromise it. Additionally, the Z-Cylinder lock is bump-proof and pick, pull, and drill-resistant — youre not getting this thing off without the key.

　　Speaking of keys, the RockSolid comes with a whopping 5 keys, so you should be set for a while, even if you lose a couple. The keys cant be copied, however, but the barcode on the key tag can get you replacements from OnGuard. Overall, the keys work pretty well, but we found they arent quite as smooth or consistent in the cylinder as some other locks weve tried. Occasional lubrication helps a lot, and thats really our only complaint about the RockSolid.

　　A thick rubber coating on the shackle is kind to your bikes paint job, and the 3.5 x 6.9-inch shackle size makes it easy to lock around your frame, rear wheel, and standard-size bike rack tubes. Its also comparatively lighter than other angle-grinder-resistant locks at 3.1 pounds. Youll notice youre carrying it, but not quite as much. And, while $250 is definitely not cheap, its way less expensive than buying a new bike and is $50 less than similarly secure options like the Hiplok D1000.

　　$250 at Amazon Best Budget Bike Lock OnGuard Bulldog STD U-Lock Specs Lock style U-Lock Lock type Key Security level Medium Sold Secure rating Silver Dimensions 9 in. x 4.5 in. Thickness 11 mm Weight 1,134 g (2.5 lbs.)

　　Pros Good value Good theft insurance Comes with frame mount bracket Comes with 5 keys Cons Not the highest security Paul Mandell The OnGuard Bulldog ($35) is a solid, affordable option for folks looking for a reliable and trustworthy U-lock. It swings well above its weight class for the price. Weve been fans of OnGuards locks and the value the brand brings to the table for some time, and the Bulldog is a great example. 

　　At 9 x 4.5, the shackle is similar to the ABUS and Kryptonite U-locks featured in this guide, albeit slightly wider. While half an inch isnt a game changer, the extra space is a welcomed feature on this lock. The shackle is 11 mm thick, which should offer plenty of protection against bolt cutters and hack saws, but doesnt take long to cut through with an angle grinder. Like other locks on this list, Onguard uses a double lock shackle feature for enhanced security, and Onguard claims the cylinder is resistant to bumping and lock picking. 

　　For such an inexpensive lock, its nice to see that it carries a Silver-level Sold Secure rating. While thats best for medium security risk lock-ups, we appreciate that its been tested and rated, which cant be said of many others in this price range.

　　The Bulldog is a competitive weight at 2.5 pounds, so it isnt too obtrusive to toss in your messenger bag or backpack. For those of you who strap the lock to your bike, you likely wont notice it. Like both the Kryptonite and ABUS locks, the Bulldog comes with a frame mount to keep your lock with your bike.

　　Of the tested lock mounts, the Onguard scores best by offering the easiest and smoothest operating frame mount. Onguard also offers theft protection on registered locks — up to $1501 on most models of the BullDog. All Onguards locks come with five keys — one with an LED for finding a keyhole after dark and four more standard keys to stash as you see fit.

　　We were impressed with the simple, no-fuss function of the Bulldog, and doubly so for the included mount. At $35, this lock offers tremendous value and outshines other locks in its price class. If you are looking for a simple and secure lock that wont break the bank, the Onguard Bulldog might just be the lock for you.

　　$29 at Amazon Best Folding Bike Lock HipLok Switch Specs Lock style Folding Lock type Key Security level Low Sold Secure rating Bronze Dimensions 33.5 in. length Thickness 5 mm Weight 1,043 g (2.3 lbs.)

　　Pros Great for quick, low-security lock-ups Relatively light Wearable clip allows it to hook onto a belt, bag, or strap Versatile and user-friendly mounting system 85cm locking length makes it easier to lock to things Rattle-free bike mount Cons Bronze-rated security is less robust than other options Belt-clip was finicky on really thick belt Paul Mandell Similar to the ABUS Bordo described below, the Hiplok Switch ($90) is a conveniently portable folding bike lock for low to medium-security applications. Unlike the Bordo, however, the Switch has been tested by Sold Secure and carries a Bronze rating. One of our favorite things about it: it comes with three options to attach it to your bike or wear it clipped to your belt — and you can easily switch between the two. However, well be quick to point out that this lock is more about convenience than the highest level of security.

　　Unlike U-lock and chain locks, which can be bulky and heavy, folding locks like the Switch are much more compact and typically lighter in weight. Not only does it fold down into a compact, tidy package, but the Switch fits nicely into its holster, which mounts unobtrusively to the fixed bracket on your bike frames bottle cage mounts. The holster is easy to unclip from the bracket, and alternatively, you can carry it on your belt, a pack strap, or even the top of your pants. If youre not carrying your Switch lock on your bike, you can fit the Switch plate to a bottle cage and swap between them — you dont need to remove the bracket from the bike.

　　Like other folding locks, the Switch consists of several steel plates that unfold to form a larger loop. The six hardened steel plates are 5 mm thick and fold out to a 33.5-inch length. This makes it easy to fit the lock around your bike frame, rear wheel, and a fixed object — especially compared to U-locks with much smaller locking areas. The keyed lock is easy to use, and it comes with three keys. That said, youll need to remember to carry one and keep track of it.

　　With a Bronze Sold Secure rating, this isnt the burliest or most secure lock out there. Those steel plates are no match for an angle grinder, and given a little time, it seems like bolt cutters and a hack saw could get through it, too. The other weak point of folding locks is the pivot points, which can be susceptible to drilling or prying. That said, this lock doesnt claim to be the most secure, and it is intended for those medium-risk scenarios where a lock like the Switch will deter opportunistic thieves.

　　The Switchs real beauty is its versatile carry design. You can mount it on your bike, clip it to your pants, or switch between the two. This makes it particularly convenient and easy to bring along on any type of ride.

　　Read review: Finally, a Bike Lock Thats Easy to Carry: Hiplok Switch Review

　　$85 at AmazonCheck Price at Backcountry Best Bike Lock for Low Risk Situations Ottolock Original Cinch Lock Specs Lock style Strap Lock type Combo Security level Low Sold Secure rating Not rated Length 18 in., 30 in. (tested), 60in. Thickness 3 mm Weight 177 g (30)

　　Pros Very easily portable Quick and easy to use Comes in 3 lengths Useful for applications other than bikes Cons Not good for high security applications Paul Mandell Sometimes, you just need a lock to deter opportunistic grab-and-go bike thieves from running off with your bike, and thats where the Ottolock Original Cinch Lock ($59 to $89, depending on length) comes in. This portable and user-friendly lock is ideal for those low-risk situations where you cant keep your eyes on your bike the whole time but arent too worried about anyone with cutting tools coming for your ride. The best part, it weighs just 177 grams (30-inch size) and rolls up into a neat little package that youll barely even notice and can even fit into a jersey pocket.

　　If youre dropping by the coffee shop on the way to the office or stopping at a gas station mid-century ride to grab some sugary snacks, the Ottolock Cinch is small and light enough to bring along with you. The 30-inch length we tested rolls up to a size that fits in your hand, and you can stuff it into your jersey pocket, frame bag, or messenger bag and basically forget you even have it until you need to lock up.

　　The flexible strap design is super user-friendly, and our 30-inch version loops around your bike and a fixed object quickly and easily. It works very similarly to a really big zip tie. You just slide the end into the lock mechanism — while pushing the button — turn the combo dials, and youre good to go. Just reverse the steps to unlock it. The 3-digit combo is easy to set, and you dont need to carry around a key.

　　The low weight and portability come with one major caveat: this lock is only appropriate for low-risk situations. While the grab-and-go thief will be deterred, anyone with bolt cutters can compromise this lock in just a few seconds. The 8 mm wide band is 3 mm thick and houses three flexible stainless steel band layers inside an aramid fiber jacket. This will put up a fight against lighter cutting implements, but its security is definitely limited.

　　Regardless, the Cinch Lock is a great option when the threat of bike theft is low, but you still want the peace of mind that locking your bike provides. Its portability makes it especially useful for those on the move with limited lock carrying space. The Original Cinch Lock comes in three lengths — 18, 30, and 60 inches — so you can get the size that best suits your needs. Or, for a slightly tougher version, check out the HEXBAND Cinch Lock with six steel bands.

　　$65 at AmazonCheck Price at Backcountry A Good Value U-Lock + Cable Combo Kryptonite Kryptolok Standard U-Lock with Cable Specs Lock style Cable + U-Lock Lock type Key Security level Medium High Sold Secure rating U-Lock: Gold, Cable: Not rated Dimensions U-Lock: 9 in. x 4 in., Cable: 48 in. Thickness U-Lock: 12.7 mm, Cable: 10 mm Weight 2,359 g (5.2 lbs.)

　　Pros Strikes a great balance between portable and secure Good theft insurance Solid value for U-Lock and cable combo Cons Poorly designed frame mount Not the most secure Paul Mandell U-locks are popular among bike commuters in metro areas for a good reason — they strike a great balance between portability and security. You’ve probably seen someone utilizing the popular belt-carry, and there are even some cycling pants on the market that come with a loop to slip your U-lock in while you ride. The Kryptonite New-U ($71) is the latest iteration of the Kryptonite U-lock. We had the standard model, also known as the Kryptolock, in for this round of testing, and to nobody’s surprise, it scored high in both security and portability. 

　　The New-U has received a few upgrades to make it more secure, namely the new “double deadbolt” locking mechanism which Kyrptonite claims is more resistant to twisting attack. At a little under 3 pounds and measuring in at 9 x 4, the New-U is easy enough to throw in your bag, slip in your belt, or, as we did — strap it to your pannier rack. The New-U also comes with a frame mount to more easily tote your lock on your rig, but we found it to be a little more finicky and less secure than a ski strap on the rack.

　　One of the downsides to the U-lock is the lack of security for things like your front wheel (go ahead, ask us how we know). Fortunately, the New-U is available with a cable lock to secure your front wheel or loop through a bag or basket. We wouldnt consider cable locks secure because of how easy they are to cut through, but for a quick pop-in to the grocery store or brewery, we’re confident in its ability to at least deter would-be thieves. We especially appreciate the ability to lock up more components on our bikes and feel the value of this combined package is pretty hard to beat.

　　The New-U is on the larger side of the U-locks that Kryptonite makes and has ample room to loop through the chainstay/seat stay and rear wheel of most bikes, though mountain bikes, for the most part, were too large, and we’d recommend a different lock for your shred sled anyway. 

　　The New-U comes with $1,750 theft insurance, is supported by the Kryptonite key program (two free keys in the event of losing them), and has a 6/10 security rating. This might not be a great option for long-term or high theft-risk security, but we think it offers great versatility and peace of mind at a good price.

　　$71 at REI$53 at Amazon Best High Security Chain Lock OnGuard Beast 8016L Chain Lock Specs Lock style Chain Lock type Key Security level Very high Sold Secure rating Not rated Dimensions 6 foot chain length Thickness 14 mm diameter chain links Weight 8,800 g (19.4 lbs.)

　　Pros Super secure 6-foot length is long enough to lock 2 bikes on a car rack Comes with 5 keys $5K anti-theft guarantee Cons Expensive Very heavy not easily portable Not the smoothest key action Paul Mandell The aptly named Onguard Beast 8016L ($155 to $198) chain lock is truly a beast. This burly lock is meant for those high-security situations where you want to ensure your bike(s) dont disappear. Given its bulky size and heavy — 19.4 pounds — weight, it is definitely not a lock that youll carry around with you on the bike. This beast is best suited to duties like locking your bikes on your hitch bike rack or chaining up in a shared storage space in an apartment building. In those types of situations, it really shines.

　　The Beast chain locks come in several variations, but we tested the 8016 in the 6-foot length — a 3.5-foot version is also available. This lock consists of two components: a beefy 6-foot long chain and an equally beefy U-lock style padlock. That adds up to 19.4 pounds, which is shockingly heavy. That weight and the obvious stoutness of the package, however, speak to the security level it provides. This lock is likely to intimidate would-be thieves and make them move on to an easier target.

　　The chain itself consists of 14 mm thick, titanium-reinforced, hexagonal hardened steel links that are cut and pry-resistant. They dont specify angle-grinder resistance, but it seems like it would take quite a while to cut through both sides of one of these links to compromise it. The chain has a sturdy nylon cover to keep the chain from damaging your paint. The padlock has a 16.8 mm thick hardened steel shackle and uses OnGuards X4P Quattro Bolt Locking Mechanism. This secures the shackle on four sides, requiring two cuts to fully break through the padlock shackle.

　　The Beast 8016 hasnt been tested by Sold Secure, but it carries a rating of 99/100 on OnGuards in-house scale. OnGuards Mastiff chain lock is rated at 90/100 and has a Sold Secure Gold rating, so its safe to assume the Beast would rate higher. Still, this lock can be compromised by an angle grinder, but it would definitely take several minutes to do so.

　　The 6-foot length we tested is long enough to loop through two bike frames on a hitch bike rack. This is great for stopping at the store after a ride or parking in front of a friends house for an extended period. Given the weight of the lock, however, we certainly wouldnt recommend driving with it locked to bikes, as we could see friction causing damage to paint over time.

　　Unlike the Hiplok Gold, which is much lighter and more wearable to bring with you, the Beast is much more secure but far less versatile. Like other OnGuard locks, the Beasts keys dont have the smoothest action, but it comes with five, including one with an LED light. Regardless, it does its job well within its intended application, and ours lives in the back of the truck where its ready for action when we need it.

　　$131 at Amazon Best of the Rest ABUS Bordo 5700 Folding Lock Specs Lock style Folding Lock type Key or Combination available Security level Low-Medium Sold Secure rating Not rated Dimensions 23.6 in. Thickness 5 mm Weight 709 g (1.6 lbs.)

　　Pros Super portable Good security-to-weight ratio Fun colors available Cons Not as secure or robust as a U-lock Pivot design may be vulnerable Paul Mandell The ABUS Bordo 5700 ($85) is a nifty piece of kit for folks with limited space. Its super easy to slip into your bag, or even to stick in a back pocket for a quick rip down to the pub. At 1 pound, 9 ounces, the Bordo is very light and easily portable, but dont let its small size beguile you into thinking it isnt secure.

　　ABUS rates this lock at 7/15 on its in-house scale, which we think is solid considering its small size and ease of portability. We like to think of the Bordo as “light-duty” security. ABUS also tests its locks using the spray method to ensure appropriate protection against modern break-in tactics. While it is definitely not as secure as a U-lock or a chain, the Bordo is far and away more secure than a simple cable. 

　　Available in 60 or 80 cm, the Bordo offers a convenient and super portable way to protect your bike, and its available in eight different colors and two different configurations — keyed or combo. The 60cm version has plenty of room to slip between your seat stays and wheel, providing your anchor is small enough. Trees, pylons, or thicker anchors may require some creativity, but we had very little trouble finding a secure spot to lock up.

　　We tested the combination version of the Bordo. Setting the combination was super simple, a theme that carried with both the ABUS combo locks we tested. The Bordo also scored well in ease of use — fold it up and slip it in a secure pocket or its frame mount bracket, and off you go. Like we said — super simple. That said, we appreciated the additional holster carry option of the Hiplok Switch.

　　Unfortunately, the Bordo 5700 hasnt been tested and rated by Sold Secure, but we put it in the low-medium level of security. Any determined thief with a pair of bolt cutters or an angle grinder could compromise this lock in short order. Like the Hiplok Switch, this lock should be considered as more of a deterrent to opportunistic, grab-and-go type bike theft. We wouldnt recommend leaving your bike locked up and unattended with this lock for extended periods of time.

　　Still, the Bordo 5700 is a great little lock for quick trips and could be an excellent option as a backup lock for your front wheel or panniers in less secure areas. However, if you live in an area with low theft rates, leave your bike locked up in sight, or need the convenience and portability of a lock like the Bordo, its an enthusiastic yes from us.  

　　$85 at REI$67 at Amazon Another Great Value U-Lock Ottolock Sidekick U-Lock Specs Lock style U-Lock Lock type Key Security level Medium Sold Secure rating Not rated Dimensions 5.75 in. x 2.75 in. Thickness 12 mm Weight 760 g (1.7 lbs.)

　　Pros Reasonable price Compact and lightweight Can fit in a pocket Silicone coating is easy on your bike Smooth key action Comes with 3 keys Cons Small shackle size is somewhat limiting Not the highest security Paul Mandell The Ottolock Sidekick ($39) is a compact and affordable U-lock that shines for its portability. Its smaller size and lighter weight — just 1.7 pounds — make it easy to bring along with you but limits your locking options a bit, too. Still, if a convenient, medium-security U-lock sounds like what you need, the Sidekick has you covered.

　　Like its larger sibling, the Sidekick XL, this lock is good-looking and well-made. While a bike locks appearance is somewhat irrelevant, its refreshing to see a decent-looking option. While it may have been unintended, the full-coverage silicone coating just looks nice and will also play nice with your bikes frame.

　　Compared to other U-locks, the super-portable Sidekick is on the smaller side. The locking area measures 5.75 x 2.75 inches, which limits what you can fit in there. We found that its really only big enough to fit around the frame — we locked to the seat tube or the seat stay while testing — and a thinner fixed object. Youd be very hard-pressed to fit much else in there. If you have expensive wheels, wed recommend using some additional locks to supplement the Sidekick.

　　That said, the smaller size makes it very easy to carry with you, and if that convenience makes you more likely to use a lock in the first place, then thats a huge bonus. At 1.7 pounds, its barely noticeable in your bag or backpack, and we were even able to stuff it in the back pocket of our pants for shorter trips to the store and/or the local brewery. This is good, considering it doesnt come with a bracket to mount it on your frame.

　　Unlike burlier — and much more expensive — options like the OnGuard RockSolid, the Sidekick is intended for medium-security applications. This is more of a quick stop at the coffee shop or locking up in the office building bike room kinda lock. The 12 mm hardened steel shackle and anti-rotation deadbolt mean that tools short of an angle grinder will require some time and effort to compromise it, but its not impervious to determined thieves.

　　If convenience and portability are key concerns and you dont need the highest level of security, the Ottolock Sidekick truly shines. This compact and lightweight U-lock is easy to carry and user-friendly, and at $39, its well worth the price, in our opinion.

　　$39 at AmazonCheck Price at Backcountry Premium Price, High Security Hiplok D1000 Specs Lock style U-Lock Lock type Key Security level Very high Sold Secure rating Diamond Dimensions 6.1 in. x 3.6 in. Thickness 20 mm Weight 1,360 g (4 lbs.)

　　Pros Sold Secure Diamond rating Very hard to compromise Rubber coating is safe for bike frames Lifetime warranty Cons Very expensive Kinda heavy Rattles a bit in transport Paul Mandell Angle grinders have changed the bike theft game, so many brands are making heavy-duty locks to withstand these cutting tools. Among them, the Hiplok D1000 ($300) stands out as one of the best. This sturdy U-lock is impervious to attacks from traditional cutting tools like bolt cutters and saws, and most would-be thieves will give up before they are even close to getting through it with an angle grinder. We should know, we tested it, and it went through a total of 10 cutting wheels to make the two cuts needed to fully compromise the D1000.

　　Hiplok was one of the first to market with an anti-angle grinder lock, but the D1000 is as relevant and robust today as it was when it launched in 2021. While it has more competition, it still stands up to powered cutting tools well enough to earn a Diamond-level Sold Secure rating. Like most U-locks, the D1000 has a thick, hardened steel shackle, but this one features a coating of a graphene composite called Ferosafe. The steel is tough enough on its own to resist traditional cutting methods and prying, but the special coating grinds cutting wheels down over and over again.

　　In our destructive test, we tried several methods to break the D1000, eventually resorting to the angle grinder when the others failed. As advertised, it chewed through cutting wheel after cutting wheel, but we eventually got through on the fifth wheel — and that was just for one of the two cuts needed. That took a significant amount of time, more than most thieves will be willing to spend, plus you have to cut it twice to get the lock off.

　　Since the shackle is rectangular, even if one side is cut, you still cant turn it to open it. Thus, it needs to be cut twice. In our experience, the time and effort needed to do this will send even the most determined thief packing. Who carries 10 grinder wheels anyway?

　　The D1000 is similar in size to comparable U-locks with a 3.6 x 6.1-inch locking area. Its not huge by any means, but its big enough to capture your frame — and maybe a wheel — and a bike rack. The rubber coating is easy on your bike frame, and it comes with three high-security keys.

　　The only things we didnt love about the D1000 are the price and the fact that it rattled a bit during transport. Both of those complaints are things we can look past if it keeps our bikes safe and lasts forever, which we expect it will.

　　Read review: Best Bike Lock Ever? Hiplok D1000 Anti-Angle Grinder U-Lock Review

　　$299 at AmazonCheck Price at Backcountry Kryptonite Evolution 1090 Specs Lock style Chain Lock type Key Security level High Sold Secure rating Gold Dimensions 35.5 in. chain length Thickness 10 mm Weight 2,767 g (6.1 lbs.)

　　Pros Great security rating New deadbolt design enhances security Comes with 3 keys Light enough to carry Cons Heavier weight but not too heavy to carry Less portable than others Paul Mandell Kryptonite has been a major name in the bike security space for as long as any of us can remember, so much so that kryptonite locks are often associated with top-tier security. Kryptonite continues to bolster that reputation with the Evolution 1090 ($110).

　　At 6.1 pounds and 35.5 inches, this is a properly big chain lock that might not appeal to everyone reading through this list. For our uses, however, — securing an expensive mountain bike in a busy resort town — there isnt much more we could ask for. 

　　Like the Hiplok Gold, the Evolution 1090 carries a Gold-level Sold Secure rating, meaning that it will withstand up to 5 minutes of attack with hand tools. Kryptonite has revised the link design and the metals to increase the security for this lock, but probably the most important update to their locks is the new end-link design which eliminates a critical vulnerability in other locks by replacing the shackle with a deadbolt.

　　We’re not going to give you the specifics here, but this lock is essentially air-can and hammer-proof, which is one of the fastest, easiest, and most inconspicuous ways to break a lock. Would-be thieves will have to cause a scene to break this lock or chain. Kryptonite offers anti-theft protection up to $3,000 for registered locks along with a lifetime warranty, as well as their helpful key program — which means that when you finally lose your last key, you’ll be able to get a replacement. 

　　We had a tough time choosing a favorite between the Kryptonite 1090 and the Hiplok Gold, but in the end, the Hiplock won out. The Evolution 1090 is a little bit heavier and a little bit less portable than the Hiplok Gold, which kept it from taking the top spot for the chain locks we tested.

　　But, we still appreciate the Evolutions 1090 for its high-security rating and the peace of mind it offered, and also because the deadbolt end link is more secure than the shackle on the Hiplok (which is also why it is heavier). If you are going to keep a lock in your car for an après bike beer, the Kryptonite 1090 is the lock to buy, but if you need portability, check out the Hiplok Gold.

　　$110 at REICheck Price at AmazonCheck Price at Backcountry ABUS 8808C/85 Specs Lock style Chain Lock type Combination Security level Medium Sold Secure rating Not rated Dimensions 33.5 in. Thickness 8 mm Weight 2,325 g (5.2 lbs.)

　　Pros A more portable chain option Reasonable weight to carry with you Protective fabric sheath Combo lock offers great convenience Cons Less secure than other chains Combo may present added vulnerability Paul Mandell We liked the Abus 8808C ($85) for its combination (get it?) of ease of use and solid security rating. Combo locks are great for folks who frequently lock and unlock their rigs in suspect areas and also for folks who regularly lose or misplace their keys. While it doesnt top our list, we still think the Abus 8808C is a great option to throw in the front basket for a quick run to the grocery store or other errands around town.

　　At 5.2 pounds and 43 inches, the 8808C is a little lighter and a little bit longer than some other chain locks on this list. It is certainly easier to carry than the Kryptonite 1090, but it does not carry anywhere near as well as the Hiplok Gold. Its also less secure, offering a 9 out of 15 security rating from ABUS.

　　The combination shackle is also quite a bit less robust than a standard steel hook or deadbolt like the one found on the Kryptonite 1090. At 8 mm thick, the square-link chain isnt as thick as other chains on this list, which makes it more vulnerable than both the aforementioned locks. That said, the 8808C is still a great lock for medium-security applications. 

　　We appreciated the lighter weight and simplicity of the combination tumbler. The 8808C is fully wrapped in a nylon chain cover, and the combo tumbler has a helpful dust shield that keeps dirt, water, and debris from gunking things up. While its certainly not the most robust lock weve tested, the 8808C offers more than adequate protection for beer runs or quick lock-ups between stops in town (depending where you live). If that sounds like you, the 8808C is definitely worth your consideration.

　　$75 at Amazon Tex-Lock Eyelet With X-Lock Specs Lock style Chain and U-Lock Lock type Key Security level Medium High Sold Secure rating U-Lock: Gold, Chain: Silver Dimensions U-Lock: 2 in. x 5 in. , Chain: 31, 47, 63 in. (tested) Thickness U-Lock: 12 mm, Chain: 6mm, wrapped in braided textile Weight 1,315 g (2.9 lbs.)

　　Pros Sawproof, Cutproof, Fireproof Textile chain sheath protects bike frame Long chain makes it easy to lock to things Lightweight Sold Secure Gold Rating for U-Lock portion Cons Shackle and eyelets still vulnerable to attack Paul Mandell The Tex-lock ($159) is an innovative U-lock and cable system that meets a particular niche in the cycling security world. We tested the X-lock and large Tex-lock cable, but there are a variety of sizes and lock options available. If you live or ride in an area where security is an issue, the Tex-lock is an excellent contender for your next U-lock and cable combo.

　　What makes the Tex-lock particularly innovative is the textile sheath that covers the 6mm chain. Not only does the sheath prevent damage to your frame or paint, but also it is cut-resistant, saw-resistant, and fireproof. The textile-covered chain by itself receives a Sold Secure Silver rating, and when combined with the 12mm X-lock mini U-lock, the system receives a Sold Secure Gold rating.

　　Of the cable locks included on this list, the Tex-lock cable is far and away the most robust and secure that we’ve tested. Like other chains and cables on this list, the Tex-Lock carries well over the shoulder, and riders can purchase a frame mount separately if they wish. We threw the Tex-lock in a bike basket and had few complaints about its portability. The cable and U-lock weigh in at 1,315 grams, making this a lightweight, portable, and highly secure option.

　　The folks over at Tex-lock clearly thought out the design of this lock. Immediately upon receiving it, we noted that the eyelets are shaped and sized differently; this is so users can loop the cable through a wheel and around a rack before securing it with the X-lock. While the X-lock is pretty small (currently the smallest and lightest sold-secure gold lock on the market), its more than adequate in size to secure the frame of your bike to a rack and the end of the cable.

　　Indeed, this is how the Tex-lock is intended to be used. And, we were impressed by the easy and intuitive design of this combo. We also like the X-lock by itself. Its super compact and transports easily — a great option for an evening spin to the brewery or a quick stop at the market.

　　In terms of security, the eyelets on the cable are likely the most susceptible to attack in this latest iteration. Tex-Lock has switched to hardened steel to slow down attacks with saws. However, it seems likely that a good strike with a heavy hammer could break the eyelet at its smallest point if positioned properly.

　　The X-lock’s 12mm hardened steel shackle is significantly more secure but also likely susceptible to the classic freeze-and-smash attack. Its also important to note that like every lock on this list, the Tex-lock isnt meant to completely prevent theft, but rather to deter and slow down would-be thieves.

　　Check Price at Osloh Ottolock Sidekick XL U-Lock Specs Lock style U-Lock Lock type Key Security level Medium Sold Secure rating Not rated Dimensions 9.5 in. x 4 in. Thickness 14 mm Weight 1,083 g (2.4 lbs.)

　　Pros Reasonable weight for size Silicone coating is easy on your bike Large opening makes it easier to use Comes with 3 keys Smooth key action Cons Larger size Not the highest security Paul Mandell The Ottolock Sidekick XL ($59) started out as a limited-run model but became a full-time member of the brands lineup of locks. It is essentially a larger version of the compact Sidekick described above, offering an increased locking area and more flexibility in what you can fit inside and lock your bike onto. Its still relatively lightweight, easy to use, well-made, and affordable, making it a great option for those with medium security needs.

　　One of the primary drawbacks to U-locks is that they can be difficult to fit around your frame, rear wheel, and an object to lock onto, but the Sidekick XLs larger size aims to make that easier. The 9.5 x 4-inch locking area simply fits around more of your bike and the poles that youre likely to lock onto quickly and more easily than with smaller U-locks like Ottolocks own Sidekick or the super-sturdy OnGuard RockSolid. We found we could typically lock it around both the seat tube and rear wheel when locking up to standard city bike racks, adding a bit more security than locking to the frame alone.

　　Without any advertised angle-grinder-resistant technology or a Sold Secure rating, we view this lock as more of a medium security option. It has a 14 mm thick hardened steel shackle and an anti-rotation deadbolt that will require two full cuts to compromise. This means it would take some real effort to get through it with bolt cutters or a saw, but an angle grinder can slice right through it pretty quickly. Still, thieves seeking an easy target are likely to be dissuaded and move on, but we wouldnt use it as the only line of defense in a high-risk area or overnight on a city street.

　　For quick stops on the way to work or generally low-crime locations, however, the Sidekick XL is a great option. Its size makes it quick and easy to use, and its smooth key action — it comes with three — wont have you fumbling around to lock and unlock it. The entire thing is covered in non-marking silicone, so its easy on your bikes paint and other items that you carry it with. On that note, its size dictates that youll probably be stashing it in a messenger bag or backpack for transport, as it doesnt come with a mounting bracket. At 2.4 pounds, its on the lighter side for its size, so it wont really weigh you down.

　　If youre seeking a high level of security, be prepared to pay more for something like the Sold Secure Diamond-rated Hiplok D1000 or the OnGuard Rocksolid. Those locks are roughly five times more expensive but will send even angle grinders packing. Otherwise, if the theft risk is lower, the Ottolock Sidekick XL is a great option to consider.

　　$55 at AmazonCheck Price at Backcountry ABUS Ultra 410 U Lock + Cable Specs Lock style U-Lock and Cable Lock type Key Security level Medium Sold Secure rating U-Lock: Silver, Cable: Not rated Dimensions U-Lock: 9 in. x 4 in. Thickness U-Lock: 12 mm, Cable: 10 mm Weight 1,049 g (2.3 lbs.)

　　Pros A good lock system for a good price Size accommodates a wide range of frames Added cable for securing your front wheel Fair price for the U-lock and cable combo Cons No theft insurance Not the highest security Mounting bracket isnt great Paul Mandell For those of you looking for a budget-oriented option to keep your trusty steed safe, there is the ABUS Ultra 410 U Lock and Cable System ($60). ABUS has a solid reputation in the market for making sturdy and reliable locks, and the 410 Ultra is no exception. We found it functionally comparable to the Kryptonite New-U but felt that it might not be on the same level in terms of security. Its a little lighter than the Kryptonite Version and a little thinner, but the hardened steel shackle still inspires confidence.

　　Like the New-U, the Ultra 410 also comes with a cable lock to secure your front wheel or, at the very least, deter someone from trying to make off with it. Again, we dont consider cable locks secure and urge users to exercise caution and good judgment when using one to protect their valuables.

　　With a 9 by 4-inch shackle, the 410 happily accommodates a wide range of frames and offers enough space to lock through your frame and rear wheel, providing the object youre locking to isnt overly large. It comes with two keys that lock and unlock smoothly, but it doesnt have a dust cover for the keyhole, so users will need to be attentive to keeping their lock clean. 

　　The 410 has a “double-locking” mechanism that ABUS claims decreases thieves ability to pick the lock. Their website claims that the lock passed the spray ice test with flying colors. ABUS rates this lock at 8/15 on their in-house security scale. That said, we struggled to find any information pertaining to theft insurance from ABUS, and in that regard, Kryptonite definitely wins out.

　　Another gripe we had with this lock is the frame mount — it isnt great. It broke almost immediately and we found ourselves back to relying on a ski strap to tote the lock. In the end, however, these are minor complaints, and the 410 is a solid lock system at a reasonable price. And, while it might not offer the same fit and finish or the same kind of insurance as other locks on this list, the ABUS 410 is still a great option — especially for folks on a budget who need to protect their bike. 

　　$60 at REI$40 at Amazon ABUS Numero 5510C Specs Lock style Cable Lock type Combination Security level Low Sold Secure rating Not rated Dimensions 70.9 in. Thickness 10 mm Weight 499 g (1.1 lbs.)

　　Pros A great option for low-security situations Combination locks are extra convenient Lightweight and easily portable Cons Cable locks are extremely easy to cut Paul Mandell So, you’re in the market for an inexpensive cable lock. Maybe you need a lock to keep your panniers safe, or to lock the kids bikes to yours on your ride to the park. Cable locks are a simple and practical way to add a margin of security to your ride when you need it, but lack the same kind of security and peace of mind offered by more substantial locks and chains.

　　There is certainly a value to having a small cable lock on hand, and the ABUS Numero 5510C ($30) is an affordable option to keep wrapped on your bike for quick trips or to bolster another lock. At $30, its inexpensive, and at just over a pound, the Numero is almost unnoticeable in your bag or on your bike. 

　　As far as features go, the Numero is a pretty standard cable lock with good ergonomics and a few well-thought-out features. Its 70.9-inch long 10 mm cable is wrapped in a PVC coating to avoid damaging your frame. The tumbler indexes well and is easy to see after dark, thanks to the ABUS darktouch feature.

　　ABUS rates the Numero at a 3/15 security rating, meaning that its the most vulnerable lock on our list. We definitely wouldnt recommend locking your rig up out of sight with this lock, and doubly so for high-end bikes. But, if you need a cable lock for securing your front wheel or a bag to your bike while you’re away, the Numero will certainly serve in that application.

　　$30 at REICheck price at Amazon Bike Locks Comparison Chart

　　We compared an array of styles and price points, with the OnGuard Bulldog being our favorite budget option; (photo/Paul Mandell) How We Tested Bike Locks Our expert testing team is composed of experienced cyclists and outdoors-oriented people looking for the best products on the market. Our staff includes former bike racers, recreational cyclists, folks who bike-commute 60 miles a week, and everyone in between — people who care about fit, finish, and function in every product we use.Many of us rely on bikes for transportation, and some of us own very expensive bikes that we absolutely do not want to get stolen. As such, were always seeking out the best bike locks for our personal use and have experience using all types of locks in our daily lives.

　　Our Expert Testers This guide is a combined effort with most products tested by frequent GearJunkie contributor Paul Mandell and GearJunkie Editor Jeremy Benson and a few by other members of the editorial team. Lead tester Paul Mandell has 2 decades of experience in the saddle as a competitive racer and recreational rider. He completed his master’s degree in exercise science, where he studied the critical power model for cycling. These days, he prefers lift-accessed gravity riding and long adventure rides with plenty of descending. He still finds time to get out for the occasional gravel grind or single-track loop near his home base in California’s Eastern Sierra. He owns quite a few different bikes and often uses them for short commutes and errands around town, where he uses bike locks regularly. Pauls testing experience extends beyond bike locks, and he has contributed his expertise to numerous other guides, including bike lights, bike computers, and bike phone mounts, to name a few.

　　Jeremy Benson has been cycling for over three decades. An avid mountain and gravel rider and racer and lover of bikes of all kinds, he currently has over ten bikes in his possession. Many of the bikes he owns also happen to be quite expensive or customized, so he also owns a small fleet of bike locks to keep them safe in varying scenarios. Jeremy has been professionally testing and reviewing bikes and related gear for the past 8 years, and has a great ability to tease out subtle performance differences in the products he tests. In addition to bike locks, hes contributed to many other guides, including hitch bike racks, mountain bike shoes, and mountain bike helmets.

　　We burned through 5 grinder wheels to make one of the two cuts needed to open the Hiplok D1000 U-lock; (photo/Terrance Parker) Our Testing Process We vetted the most popular locks on the market and ordered a selection of different styles — chains, U-locks, folding locks, and cables. We then evaluated them for fit, finish, and function. We carted these locks all over town in messenger bags, backpacks, pockets, or included frame mounts. We locked our bikes to city bike racks, fences, light poles, and hitch bike racks and evaluated the portability, security, and ease of use for each lock when used in real-world scenarios.

　　We also put some of the manufacturers security claims to the test and attempted to break into some of the featured locks to see if they really stood up to attacks. When the smoke and dust settled, we came back with the best options for the different styles of locks on the market today.

　　Buyers Guide: How to Choose a Bike Lock If youve never had a bike stolen, consider yourself lucky. If you have had your bike stolen, then you know that it is a terrible feeling and can be a significant financial hit. Either way, there are loads of great bike locks on the market to protect your bikes from theft. Whether you need something super portable and convenient for low-risk situations or something virtually unbreakable for high-crime areas, there are options to suit every bike security need.

　　Styles of Bike Locks Bike locks traditionally come in four different styles, each with its own benefits and drawbacks.

　　U-locks like the OnGuard RockSolid are among the most popular and secure types of locks on the market; (photo/Tucker Adams) U-Locks U-locks (also known as D-locks) are essentially oversized padlocks. They vary in their level of security, but overall, they can be the most secure option, with several models on the market being angle-grinder resistant and carrying the Diamond-level Sold Secure rating.

　　U-locks have a hardened steel U-shaped shackle that fits into a crossbar lock that closes the loop. These can have a locking mechanism on one or both ends of the U shape. If it locks both sides, it usually means that the lock cant be twisted and must be cut twice to be removed. Given their design, U-locks are comparatively a bit limited in terms of what they can lock up. The largest U-locks can usually fit around a bike frame tube, the rear wheel, and a fixed object to lock onto. Smaller U-locks may be limited to fitting around just the frame.

　　For most folks in most situations, a solid U-lock like the Kryptonite New U will be more than adequate. If the risk of theft is high, then an angle grinder-resistant model like the OnGuard RockSolid or the Hiplok D1000 is a safer and more secure bet to ward off thieves with power tools.

　　While limited by its size, a U-lock is a very secure design. Adding a cable allows you to lock up more components; (photo/Paul Mandell) U-locks offer the best combination of security and portability, but you’ll want to ensure that the lock you choose fits your specific bike. The shackle size and, therefore, the size of the locking area varies by model, so that is important to consider when choosing the right lock for your needs. Folks considering a U-lock may also want to pick up a cable or folding lock to help secure your other wheel and/or bags while you are away from your bike. Or, a combo like the Kryptonite New-U with Cable or the ABUS Ultra 410 U-Lock and Cable will make it easier to lock of your frame and both wheels.

　　The Hiplock Gold is a wearable chain lock that had us feeling pretty good about leaving a mountain bike chained up in a resort town; (photo/Paul Mandell) Chain Locks Chain locks consist of a length of chain with a locking mechanism that secures the two ends together. Some chain locks come with a padlock, and others have a built-in locking mechanism. These locks vary pretty dramatically in terms of security based on the thickness of the chain links and the quality of the locking mechanism itself. They also come in different lengths to suit different needs, from shorter and more portable options like the Hiplok Gold to super beefy 6-foot-long models like the OnGuard Beast 8016L.

　　Chains also must be cut twice to remove, making them a bit more arduous to compromise but far from impossible. The value of a chain lock is that it can take a long time to cut through some of them and usually draws attention. Chain locks also offer a higher degree of user-friendliness when locking. The flexible nature of the chain itself, along with the length, allows you to lock up more bikes at once or lock your bike to a larger object.

　　Chains are only as good as their weakest link, so choose one with a strong padlock or locking mechanism. Additionally, some chain locks, like the ABUS 8808C, have a combination lock that isnt as robust as a padlock or shackle. Padlock-style locks are susceptible to attack with the wrench and cutter methods. Locks like theKryptonite 1090,which uses a deadbolt, are more secure than padlocks and traditional shackles.

　　The primary drawback of chain locks is their size and weight, which typically makes them less portable than other styles. For example, the OnGuard Beast 8016L is not only big and bulky, but it weighs over 19 pounds. No one wants to ride around with that, but its amazing to leave in the car to lock your bikes on a hitch rack. In contrast, the Hiplok Gold is one of the lightest chain locks we tested at 5.2 pounds, and its innovative belt-carry design makes it pretty easy to take with you.

　　Folding locks, like the ABUS Bordo 5700, fold-down small and are portable but not the highest security; (photo/Paul Mandell) Folding Locks Folding locks like the ABUS Bordo 5700 and the Hiplok Switch are composed of a set of hardened steel bars that are attached by pivot hinges at each end and a lock that connects the two free ends. These allow roughly the same flexibility and locking area as some chain locks but at a lighter weight and a more easily portable package. It varies by model, but generally speaking, folding locks are less robust than many U-locks and chain locks, but they shine for their portability and are adequate for medium security situations. That said, most folding locks dont stand a chance against a bike thief armed with an angle grinder.

　　Compared to other styles of locks, folding locks fold into a compact and tidy package. Most come with frame-mount brackets that hold them unobtrusively on your bike until you need them. They can also often fit into a pocket, take up little space in your backpack, or maybe even come with a belt carry clip like the Hiplok Switch.

　　Strap locks like the Ottolock Cinch Lock are really easy to use but arent the highest security option; (photo/Tucker Adams) Strap Locks A relatively new breed of low-security locks resemble large zip-ties with integrated locks. These are intended to deter opportunistic grab-and-go theft in low-crime areas. Typically, these are very lightweight and smaller in size, so they are easy to bring along with you on any type of ride. They can be useful as a standalone lock for a quick stop at the coffee shop or as a supplemental lock for your front wheel or other gear, along with a more robust lock on the frame.

　　That said, these are among the easiest locks to compromise, so they shouldnt be relied upon for extended periods or anywhere that bike theft is a common problem. Typically made from thin steel wires covered in a rubberized coating, they can be cut quickly and easily.

　　The Ottolock Original Cinch Lock is an example of this style of lock. It weighs just 6 ounces and rolls down small enough to fit in a jersey pocket. The convenience factor is very high, but the security level is quite low.

　　While the security level may be relatively low, the portability level is very high. The Ottolock Cinch Lock can fit in a jersey pocket; (photo/Tucker Adams) Cable Locks We here at GearJunkie dont consider cable locks to be secure on their own, and neither should you. They are only meant as an accessory to your main lock and can be used to lock your wheels or other gear that’s on your bike. That said, they are better than no lock at all, but we recommend other types of locks.

　　These locks use a braided steel cable that’s attached at each end with a lock. Cables can be cut extremely easily and silently, which makes them the number-one lock we have seen bike thieves seek out when stealing bikes.

　　While a cable lock is inexpensive, lightweight, and portable, we dont recommend using one in high-risk areas. They are just too easy to break; (photo/Paul Mandell) Lock Types Bike locks usually come with either a combination or a keyed lock mechanism. We find that most people gravitate towards one style or the other based on personal preference. That said, broadly speaking, the most secure locks on the market usually have a keyed lock.

　　The Hiplok Gold has a keyed lock and comes with three copies of the key in case you lose one or two; (photo/Paul Mandell) Key Keyed locks use a key that goes into a lock cylinder and is turned to unlock it. Of course, you need to carry a key with you to use this type of lock, which may be a drawback for some users. Most locks come with multiple keys, so you have extra for different users, keychains, or in case you lose one — or several.

　　Most keyed locks come with high-security keys that cant be copied, but you can usually get spares from the brand. The lock cylinders themselves are usually also specially designed to be resistant to picking, drilling, and other forms of brute force damage. As long as youre comfortable carrying a key around with you, we recommend keys over combinations because they typically are more robust.

　　Combination Combination locks are preferred by many people because you dont need to carry — or keep track of — a key. Just set a combination, and youre good to go. That said, most combination locks are a bit more susceptible to theft as codes can be cracked, and the locks themselves are often a bit less robust so they can be damaged or broken more easily. There are exceptions to the rule, of course, as there are many super heavy-duty combo locks available. If the ease of using a combination lock makes you more likely to lock up your bike, then thats the way to go.

　　The Tex-Lock provides a lightweight, novel, and user-friendly solution for securing your bike at multiple points with its textile-covered chain and U-lock combination; (photo/Paul Mandell) Ease of Use Each lock style works differently, and finding the one that fits your needs is pretty easy. Most locks are honestly pretty easy to use, but often a certain style may work better for your needs and, therefore, be more user-friendly. When choosing the right bike lock for you, its important to consider where youll use it, what needs to be locked, what youre locking to, and how youll transport the lock itself. The best bike lock in the world is no good if it doesnt fit your bike or its a pain to carry with you.

　　When buying a lock, take a good look at how the locking mechanism works, as well as how easy it is to lock and unlock, before deciding which one is right for you. All of the locks featured in this guide scored well in ease of use, but individual preferences may vary. Do bear in mind that combo locks are usually more susceptible to attack than deadbolts and shackles, but offer a slightly easier locking and unlocking situation.

　　Some locks, like the Ottolock Sidekick, are easily portable. This lock fits in the back pocket of a pair of pants; (photo/Tucker Adams) Size and Portability Locks come in a variety of shapes and sizes, so youll want to choose the one that fits your specific needs. This applies to the size of the lock and what you can lock up and lock onto it with, but also how you intend to transport the lock. Portability and security often have a direct relationship, so keep that in mind. Generally speaking, the lighter and smaller the lock, the less robust it is, and vice versa.

　　U-locks come in sizes that usually can only fit one bike unless they are combined with a supplemental cable. Still, the U-locks we tested top out at around 4 pounds, and they are small enough to fit into a backpack, messenger bag, or, in the case of the Ottolock Sidekick, your back pocket. Some even come with frame mount brackets so you can carry them on the bike. We liked the one that comes with the OnGuard Bulldog.

　　With a six-foot length and a 19.4-pound weight, the OnGuard Beast isnt a lock you want to carry around; (photo/Tucker Adams) Chain locks come in different lengths, and generally, larger and stronger locks are heavier but more secure. Take the OnGuard Beast, for example. This burly six-foot-long chain weighs a whopping 19.4 pounds. No one wants to carry that anywhere, but its awesome for keeping in your vehicle to lock bikes to your hitch rack. In contrast, the Hiplok Gold weighs just 5.2 pounds and has a carry system to wear it around your waist. Its not as long or burly, but itll have you covered in most situations.

　　Then there are highly portable folding locks like the ABUS Bordo and the Hiplok Switch. The size and carrying brackets of these locks make them easy to bring with you, even if they arent the highest security. The same applies to strap-style locks like the Ottolock Original Cinch — its incredibly light and portable, but only really good for low-risk situations.

　　Sold Secure Diamond-rated locks can withstand 1.5 minutes or more of a cutting wheel on an angle grinder. New vs. used when trying to cut the Hiplok D1000. It took 5 wheels to make one cut; (photo/Terrance Parker) Security Ratings Bike locks provide varying levels of security based on their design and the materials used in their construction. Not all locks will protect your bike to the same degree, nor are they intended to. For this reason, its important to purchase a bike lock or locks that meet your needs for security based on the risk of theft where you intend to lock them up and the value of your bicycles.

　　Sold Secure is an independent lock testing facility that rates locks based on their resistance to a bike thiefs most common forms of attack. They have created a rating scale with four levels — Diamond, Gold, Silver, and Bronze — which correlate with the relative difficulty of compromising a lock. The four ratings and their criteria are listed below.

　　Diamond: The highest level of security. Diamond-rated locks must be able to withstand dedicated attacks with specialized tools for at least 5 minutes, including 1.5 minutes with an angle grinder. These locks are intended for expensive bikes and extended periods in high-risk areas. Gold: A high level of security. Gold-rated locks must be able to withstand attacks with specialized tools for at least 5 minutes (not counting angle grinders). For use in high-risk areas. Silver: A moderate level of security. Silver-rated locks must be able to withstand attacks from an enhanced tool list for at least 3 minutes. These locks are intended for use in moderate-risk areas for shorter periods of time or as secondary locks. Bronze: A low level of security. Bronze-rated locks must be able to withstand attacks from a basic tool list for at least 1 minute. These locks are intended for use for short periods in low-risk areas to prevent opportunistic theft. An easy way to know if the lock you are buying has been tested and rated is to look for the Sold Secure logo — most brands advertise the rating. Bike lock brands also do their own in-house testing, and many of them assign a security rating based on their own scale to provide similar information to the consumer. Fortunately, they all seem to be pretty accurate when compared and averaged. Some, but not all of the locks we featured in this article are vetted by Sold Secure.

　　A U-lock/cable combo is a good way to add some extra security, especially if youve got an expensive wheelset; (photo/Paul Mandell) Price and Value In general, as the price increases, so does lock security. To find the right value for you — the perfect balance of price and security — consider the value of your bike(s) and the risk of theft where youre locking it up. No one wants their bike stolen, but obviously, if you have an expensive bike, it will fetch a higher price, and thieves are more likely to risk cutting a flimsy cable lock or even going after a sturdier D-lock with an angle grinder. Remember, any lock can be cut eventually, and security comes from the amount of time it takes to break a lock.

　　Budget Just because you dont have a lot of money to spend doesnt mean you cant get a quality bike lock that should keep your bike secure (most of the time). While budget-friendly bike locks arent rated as high by Sold Secure — usually Bronze or Silver — they definitely work better than nothing and will deter opportunistic theft or short attacks from most tools short of angle grinders.

　　The OnGuard Bulldog ($35) is one of the least expensive models we tested, but this U-lock still boasts a Silver-level Sold Secure rating. This bike lock is easy to use, comes with a great frame mount bracket, and gets the job done without emptying your wallet. Similarly, the Ottolock Sidekick ($39) and Sidekick XL ($59) offer a similar level of security in a more refined-looking package.

　　The Kryprotnite New-U Kryptolock STD with Cable ($71) is another great value product. It includes the Sold Secure Silver-rated U-lock and a cable to loop through your front wheel. This is a nice package that provides more locking flexibility than a U-lock on its own.

　　From budget-friendly models like the Ottolock Sidekick to premium options like the OnGuard RockSolid, bike locks vary widely in price; (photo/Tucker Adams) Mid-Tier As we climb the price ladder, the security level and rating typically follow, or we also see some more specialized or complex designs. While not the most secure options, the folding models we tested, the ABUS Bordo 5700 and the Hiplok Switch, both sell for $85 and score high marks for portability and convenience. These locks are super easy to carry and have much larger locking areas than U-locks.

　　A little higher in price, theHiplok Gold($130 to $140) boasts a Gold-level Sold Secure rating, so it brings a higher level of security. At 5.2 pounds and with a convenient wearable design, its easily the most portable chain lock on the market. Its not impervious to angle-grinder attacks, but its a great option for all but the highest-risk areas.

　　Premium Above around $200, we find ourselves in premium bike lock territory. Locks in this price range are typically the most secure, with some even carrying the Diamond-level Sold Secure rating. These locks are usually very robust and often include special materials and features that command a higher price tag. While these locks are expensive, they are still much cheaper than replacing your bike.

　　The Hiplok D1000 ($300) is a good example. This super burly U-lock was one of the first anti-angle grinder models that is capable of fending off very determined thieves armed with power tools. It includes a graphene composite coating on its thick, hardened steel shackle. This coating is very resistant to the cutting wheels on angle grinders, and it requires numerous wheels and lots of time to break this lock. The OnGuard RockSolid ($250) is another super-tough, Diamond-rated U-lock that will burn up many grinder wheels with its diamond-ceramic-coated steel shackle.

　　Considering how youll carry your bike lock is an important step in finding the right one; (photo/Paul Mandell) Frequently Asked Questions What is the most secure way to lock my bike? Lock your bike through one of the two triangles made by the frame with a high-security lock. Using a cable or chain lock, also lock the wheels to the frame or to the post you are locking up at.

　　Never lock your bike using the seat post, handlebars, or just a wheel, as the bike can still be easily stolen leaving those parts behind.

　　Is there a bike lock that can’t be cut? No. With enough time and the correct tools, any lock can be cut. Even the most expensive angle grinder-resistant locks can eventually be compromised, it just takes a long time and the thief needs to be carrying enough cutting wheels to do it. While they arent unbreakable, it takes long enough that they might as well be.

　　Where should I lock my bike if there’s no bike rack? Depending on the situation, you can lock your bike frame to its wheel for a very short time. If it is an extended period of time, you should find a pole, tree, gas meter, light pole, street sign, or other fixed object to lock to, even if it means you have to walk a block or two.

　　What is the most secure type of lock? In our experience, U-locks can be made to be the most secure. With the use of special coatings on top of thick, hardened steel shackles, U-locks can resist all types of attacks from the tools that bike thieves use, including angle grinders. Still, the locking areas of U-locks is relatively small, so other parts of your bike — wheels, seat, handlebar, etc. — may still be susceptible to theft.

　　It depends on numerous factors, but chain locks are the next most secure option. The burliest chain locks on the market will turn most thieves away, but they usually are easier to cut with an angle grinder than a super-expensive U-lock.

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