Our cycling crew has spent years living and breathing an extensive range of bikes, gear, and accessories. To track down the best bike lock available for your beloved bike, we dove deep into the data and leaned on everything we've learned about different lock types and what cyclists need from them. We scoured the market for the heavy hitters and fan favorites from over a dozen brands, and since we don't take freebies, we bought the top contenders ourselves to put them to work protecting our own favorite bikes.
We spent several months putting these locks through the ringer, securing them to racks, poles, trees, and fences through more lock-and-unlock cycles than we can count. We even spent hours repeatedly installing the mounting systems to make sure they wouldn't be a headache for you to use. To make sure we were giving you the full picture, we even passed the locks around to our riding buddies to get their honest take on how they held up during the daily grind.
We evaluated each lock across four performance metrics, each weighted by importance. Security carried the most weight at 40% of the overall score. While security is fundamental to any bike lock, it doesn't account for how the added weight affects your back and legs during long rides, or the frustration of wrestling with a lock in harsh weather. That's why we also tested portability (25%), ease of use (20%), and versatility (15%). Here's how we measured each category.
Security
We began by reviewing security ratings from independent agencies such as Sold Secure and Foundation ART, which evaluate each lock's structural integrity and susceptibility to compromise. While we didn't treat these ratings as definitive, they provided a valuable starting point for our assessment.
Our final test—conducted at the end of the testing period for obvious reasons—involved systematically destroying every lock. After identifying each model's weak points, we began with inexpensive hand tools commonly used by bike thieves: cable cutters, diagonals, and a three-pound hammer. These tools are inexpensive, easy to carry, and conceal. Next, we escalated to larger, more destructive implements also favored by thieves: 24" bolt cutters and a 12" hacksaw. For locks that resisted hand tools, we turned to power tools. Using a powered angle grinder with a cut-off wheel, we timed how long it took to break through each lock.
We conducted all tests under “ideal” theft conditions, securing locks in vises to eliminate movement and eliminate variables such as position and angle. This approach allowed us to evaluate the raw strength of each lock's materials while keeping our testers as safe as possible. In real-world use, proper locking techniques—such as positioning the keyhole downward and minimizing empty space within a U-lock, can significantly increase your bike's security.
Ease of Transport
We weighed each lock to give you accurate weights that often differ from manufacturers' claims. Since frame mounts are optional and vary by only a few ounces, we excluded them from our measurements. Beyond weight, we evaluated how easily each lock could be carried on your body or in a pannier, jersey pocket, backpack, or messenger bag. For locks with frame mounts, we tested their compatibility with different bikes and mounting positions, deducting points for any that rubbed against the legs, interfered with pedaling, or rattled during rides.
Ease of Use
If a lock is a total pain to use, you're eventually going to leave it at home, and that's usually when bikes go missing. To help you avoid that headache, we spent weeks clicking, twisting, and unlocking every one of these models to separate the “buttery-smooth” winners from the ones that like to jam or stick.
We didn't stop at the lab, either; we lugged these locks all over town to see how they'd handle the real world, testing them against everything from standard bike racks to those chunky street signs and lampposts. We even scrutinized the little extras, like built-in key lights and dust covers, to figure out which features are genuine lifesavers and which are just for show. Finally, we made sure the frame mounts weren't a total puzzle to install, because your bike lock should be a helpful sidekick, not a frustrating DIY project.
Versatility
To evaluate versatility, we tested how much of a bike each lock could secure. Some models only accommodate the frame and one wheel, while others can secure the saddle, both wheels, and the frame to a fixed structure. We removed the front wheel and positioned it alongside the rear wheel to test whether both could be locked together. We also tested across different bike types and sizes—from slender road bikes with narrow tires to sturdy mountain bike frames (yes, we've tested many!) with wide tires. Locks that secured more bike components scored higher. Additionally, we evaluated how well each lock worked for securing other valuables like dirt bikes, motorcycles, bike cargo trailers, and equipment stored in garages or sheds.
