Buying guide for Which bike lock is the most secure?
If you’re a cycling enthusiast or ride a bike to get to school or work, you never want to leave your bike unattended and unlocked, as it opens the gate for theft. As such, it’s essential to always have a strong bike lock on hand.
There are many bike locks to choose from, so how do you know which one to buy? Above everything else, your bike lock needs to provide sufficient anti-theft protection. No bike lock in the world is 100% secure, but the more durable a bike lock is, the less chance there is of someone breaking or cutting it.
The BestReviews Testing Lab researched more than two dozen bike locks to find the strongest, most reliable options. Our top pick is the Kryptonite New York Fahgettaboudit Chain Disc Lock. It’s a heavy-duty, tough-to-cut option from a trusted name in bike locks.
Our top picks
Best of the best
Product Specifications: Lock Thickness: 0.55” | Weight: 15.25 lb | Security Rating: 10/10 | Key or Combination: Key | Weather Resistance: NA
This bike lock’s heavy-duty build makes it one of the very best. It has 0.55-inch six-sided chain links made of 3t hardened manganese steel for superior strength and durability and a nylon cover for added protection. Hook-and-loop fasteners hold it in place, and a 0.59-inch shackle with a hardened steel crossbar provides superb security. (For extra peace of mind, it received the highest Diamond and Gold ratings from Sold Secure, an independent organization that tests and rates locks.) It comes with three stainless steel keys, so you have backups in case you lose one, and it includes a replaceable LED key fob.
Those who want a traditional chain bike lock will not be disappointed. It has a durable build and feel, and because it’s a chain lock, it’s easy to store in a backpack. It’s one of the heaviest chains, but if you want the ultimate bike lock for keeping your bike secure, this is undoubtedly the first one to consider.
Best bang for the buck
Product Specifications: Lock Thickness : 0.24” | Weight: 1.6 lb | Security Rating: NA | Key or Combination: Combination | Weather Resistance: Waterproof and dustproof
Some bike locks are pricey, but if you want something solid to keep your bike secure that’s also easy on your wallet, we think this Sportneer lock is an excellent option. It’s a combination lock, meaning you won’t have to worry about carrying or losing keys, and the five-digit code provides improved security over four-digit locks.
It’s made of thick manganese steel for superior cut resistance and anti-theft protection, and the lock cylinder is made from a durable zinc alloy that’s not easy to damage. You can reset the lock combination by following the instructions in the manual, and the 3.2-foot length makes it great for securing two bikes together.
It’s an excellent bike lock for those who prefer combination locks over ones that require keys. Its lightweight feel and design give it terrific flexibility for securing all kinds of bikes. For under $20, you’d be hard-pressed to find a better option.
Flexible and Durable Hybrid Lock
Product Specifications: Lock Thickness: 0.52” | Weight: 3.55 lb | Security Rating: 8/10 | Key or Combination: Key | Weather Resistance: NA
You might not see U-locks as often anymore, but that doesn’t mean they’re not a viable option. This U-lock retains the traditional bike U-lock design, and although that means it isn’t as flexible as a chain lock, it offers excellent anti-theft protection thanks to a steel looped cable, which adds extra security. It received a gold rating from Sold Secure.
The lock is made from hardened max-performance steel, which guards against hand tools and impact damage. It includes three stainless steel replacement keys with an LED fob key and a flex-frame mounting bracket for convenient use in multiple locations. This lock can also be mounted to the bike frame for easy transport.
If you want a traditional U-lock, this is hands-down one of the best options. Kryptonite even provides two replacement keys free of charge if you need them. It’s one of the pricier locks on our list, but it’s a solid choice for those who want a bike U-lock.
Easiest to use
Product Specifications: Lock Thickness: 0.5” | Weight: 1.96 lb | Security Rating: NA | Key or Combination: Key | Weather Resistance: NA
The straightforward U-lock design of this bike lock makes it suitable for all cyclists. It’s a robust steel bike lock with a hardened steel body and a double-locking shackle for superior resistance to cutting and prying. The pliable rubber coating protects your bike frame from nicks and scratches.
This simple bike lock only requires the user to insert the key and turn it to unlock it. Plus, it has a disc key for additional security and pick protection. Installation is easy, as it boasts a traditional U-lock design, so you don’t need to worry about setting combinations.
Those who don’t want a complicated combination lock or heavy chain will like this lock. It’s not as robust as other locks on our list, but it offers solid protection in many environments. It’s a terrific lock for students and casual riders who want to secure their bikes during the daytime for extended periods.
Most versatile
Product Specifications: Lock Thickness: 0.32” | Weight: 2.5 lb | Security Rating: NA | Key or Combination: Key | Weather Resistance: Rust-resistant
Chain locks are fantastic for those who want versatility and flexibility when securing their bike while not using it. It is one of the cheaper locks on our list, but don’t dismiss it because of that. It’s a 3.3-foot chain lock with excellent protection against drilling, cutting and shearing tools.
Thanks to its thick chain links, this lock is more difficult to cut or damage than standard chain locks. It’s enveloped in a protective cloth sleeve for improved resistance to rust and to prevent damaging your bike frame, and the anti-theft lock cylinder prevents technology unlocking. Also, the key can only be removed when the bike lock is locked, which helps prevent keys from getting lost easily.
We recommend this lock to anyone who doesn’t want to spend too much on a bike lock and to those who want something versatile to secure their bike, fence, grill, door or gate. It’s cheap and durable, and the lightweight design makes it easy to carry around.
Minimalist and lightweight
Product Specifications: Lock Thickness : 0.32” | Weight: 4 oz | Security Rating: NA | Key or Combination: Combination | Weather Resistance: NA
If you want something lightweight that’s easy to store and carry in your backpack and prefer combination locks, this Master Lock cable bike lock is an excellent option.
The four-digit combination is easy to set, and you don’t need to worry about holding or losing keys. It’s a high-performance braided-steel cable with superior strength, flexibility and resistance to cutting and sawing tools, and it has a protective vinyl coating for increased weather and scratch resistance.
Although inexpensive, this cable bike lock is a good choice for anyone who doesn’t want the hassle of complicated setups, installation or carrying keys. It doesn’t offer as much protection as some of the more robust options on our list, but it’ll work great for daytime anti-theft protection.
Lightweight and portable
Product Specifications: Lock Thickness: 0.63” | Weight: 1.7 lb | Security Rating: NA | Key or Combination: Combination | Weather Resistance: NA
This chain bike lock has a five-digit combination security feature, making it more secure than a four-digit lock. It is 3 feet long, which is long enough to secure two bikes side by side, and the cylinder lock is made from a durable zinc alloy for extra protection against picking and impact damage.
The lock head is made of smooth plastic, and the chain links are sturdy but not too thick or heavy. It’s easy to wrap around any bike frame, and the chains are enclosed in a protective cloth to prevent rusting.
What we like about this lock the most is its five-digit combination locking feature. Although it’s an inexpensive chain lock, that feature alone makes it worth a look. And because it’s so lightweight, it’s one of the best locks for students and daily commuters.
Durable and heavy-duty
Product Specifications: Lock Thickness: 0.55” | Weight: 2.55 lb | Security Rating: 8/10 | Key or Combination: Combination | Weather Resistance: NA
Most U-locks require keys for unlocking, but this one has a combination mechanism, making it suitable for those who want a traditional bike lock without worrying about needing to take keys with them.
This lock has a shackle made with a hardened zinc alloy that is highly resistant to cutters and leverage attacks. The PVC coating protects the lock from scratching and also helps keep your bike free of nicks and dents. You can set your five-digit combination before the first use, and an 8-out-of-10 security rating makes it suitable for most situations.
It’s a robust U-lock, and the five-digit combination is a nice feature. It is heavy-duty, meaning it’s not as lightweight as some other U-locks on our list. However, it offers superior protection and is an excellent option for anyone seeking a solid combination U-lock.
Best for casual riders
Product Specifications: Lock Thickness: 0.47” | Weight: 2.12 lb | Security Rating: NA | Key or Combination: Combination | Weather Resistance: Yes
For under $30, you can get this two-pack of durable cable bike locks. What we like about these locks is that they have a resettable four-digit combination and are each 6 feet long, making them suitable for securing not only your bike but also e-bikes, scooters, gates, lawnmowers, grills, patio furniture, sports equipment, ladders, tool boxes and more.
These self-coiling braided-cable locks are made of flexible steel and provide excellent anti-theft security. The material is highly cut-resistant, and the protective vinyl coating shields against scratching and weather damage. A mounting bracket is included so you can carry it on your bike frame as you ride.
This is a solid bargain; you get two cable locks for less than some of our other top picks. The anti-theft protection isn’t nearly as good as some of the premium bike locks on our list, but these are still a solid choice for casual riders.
Customer favorite
Product Specifications: Lock Thickness: NA | Weight: 1.2 lb | Security Rating: 4/5 | Key or Combination: Key | Weather Resistance: NA
This U-lock features an 8-inch hardened steel shackle and has been rated by an independent lab at a level of 4 out of 5, meaning it provides excellent anti-theft protection in most situations. It has a hardened steel crossbar with a vinyl cover to protect your bike frame from scratches, and it features a dual-bolt locking system for added security. It comes with two standard keys, and Blackburn offers free replacement of the keys if you register them online right away.
It’s a straightforward U-lock and one of the most affordable bike locks. The only drawback is that it requires keys. But those who prefer key locks over combinations won’t mind, and for the price, you can’t go wrong with this one.
Types of bike locks
There are a variety of bike lock types available for purchase, each suiting different needs and types of riders.
Cable locks
Cable locks are the least secure of the bunch because they're quite easy to cut through. They're lightweight, which makes them easier to handle than other lock types. They can wrap around anything without much of a fight. They're best for locking up an inexpensive bike.
U-locks (or D-locks)
These are hard to cut because they're made of very strong materials and are shaped so that thieves will have a hard time finding space to maneuver their tools. For a U-lock to be effective, you need to select one that fits around your frame but leaves very little space. It’s worth noting that you can’t lock the wheels and frame at the same time with a U-lock.
Chain locks
Chain locks look tough, and they are harder to cut through than cable locks. However, they're not as resistant as U-locks. They're heavier than other options, so they aren't a good choice for commuters who might find it annoying to lug around a clunky locking mechanism.
What to consider before buying a bike lock
Ease of transport
Bike lock sizing is super important. Make sure your chosen lock is large enough to fit around your bike and whatever object you're attaching it to. What’s more, don't choose a lock that leaves a lot of wiggle room. A tight-fitting lock is your best bet for properly securing your bike.
The most lightweight bike locks are cable locks, while U-locks are heavier. Chain link weight varies depending on the thickness and length of the chain links, but chain links are typically lighter than U-locks. Also, some U-locks come with hardware to mount to your bike frame for easy transport. That way, you don’t have to lug it around in your backpack as you ride.
Casing
Some locks, particularly chain locks and cable locks, are wrapped in protective materials to shield your bike from scratches. A soft housing might also be helpful if you tend to throw your bike lock into your backpack, as the casing will help protect other objects from getting damaged.
Most chain bike lock casing is made of nylon. Cables and U-locks typically have a PVC coating. Casings help prevent chain locks from rusting and provide a degree of resistance to weather damage. A PVC coating adds extra protection and makes handling the lock easier.
Locking mechanisms
Three different locking mechanisms are found on bike locks: keys, combinations and electronic locks. It's up to each rider to decide what works best, but there are advantages and disadvantages to each option.
Key locks: Locks that utilize keys are the most secure option, but you must remember to carry your key with you and not lose it along the way. Sure, a sneaky thief could try to pick a key lock, but they are tougher to crack than combination codes.
Combination locks: With a combo lock, you don't have to worry about remembering to bring a key. But combo locks aren't as secure as key locks. That said, the more dials your lock has, the more secure it is; a four-dial or five-dial lock is ideal. Notably, combination locks can be cracked, and some are pretty easy to cut open.
Electronic locks: Finally, there are electronic locks. This type of lock allows you to unlock your bike just by being near it or by typing a code. They are high-tech and more expensive than traditional locking mechanisms, and they aren't foolproof. They also look expensive, which could attract thieves. Many require a power source and need to be recharged. Although they've been around for some time, they haven't taken off in a big way, which may suggest that they're not all that practical.
Bike theft prevention tips
How we analyzed
We researched more than two dozen bike locks of all types, from U-locks to chain locks to cable locks, to find the best options to deter even the most persistent of thieves. We considered the strength of the material and how heavy it would be to transport as well as the different types of locking mechanisms and the brand’s overall reputation among cycling enthusiasts.
FAQ
Q. How much does a bike lock cost?
A. You can find basic locks starting at $10 to $20. These are suitable for cheap bikes and low-crime areas. Mid-range options cost around $30 to $60, while the sturdiest of bike locks can cost as much as $100 to $200.
If you have a fancy bike with lots of removable parts, spending money on a super-sturdy lock is a smart idea. If you plan on using extra locks to secure your seat and wheels, that will set you back a little more.
Q. I bought a good lock, but I'm still paranoid about getting my bike stolen while I leave it at the train station bike rack. Do you have any tips?
A. If you can, lock your bike up in the vicinity of other locked bikes. At a train station, there's probably plenty of intermittent foot traffic, but there may also be stretches of quiet. In that case, lock your bike up with two locks if you're worried. Or, find a fancy bike and secure your bike next to it. Your bike won't look as appealing to thieves. In general, bike thieves target expensive models or whatever is easiest to snag.
Q. I have a key entry U-lock for my bike. What's the best way to place it to secure my bike?
A. Good choice! Make sure to get a tight fit. That makes it tough to find a place to cut through.
You can also position the key entry down or out of the way to make it tough for a thief to pick. It'll make it harder for you to unlock, but if you're in an area where bike theft is common, it's a good preventative measure.
Q. How are bikes typically stolen?
A. Several techniques may be used to steal a bike. The most common ways include the use of bolt cutters, angle grinders and cable cutters. Bike locks without a robust and durable build are susceptible to these tools. To get the maximum protection against cutting tools, it's best to use a thick bike lock.
Lock-picking is another common way bikes are stolen, and while most locks have adequate lock-picking protection if you want to avoid this issue altogether, it’s best to get a combination lock. Another method is called levering; this involves using a tool to pry open a bike lock. The best way to prevent levering is to use an appropriately sized lock for your bike to minimize leverage space as much as possible.
