10 Best Bike Chain Locks 2025 in the United States

The Sportneer 5 Digit Combination Bike Chain Lock is designed to offer strong protection for your bike with a keyless, easy-to-use combination mechanism. Its 6mm thick alloy steel chain is tough enough to resist cutting and sawing attempts, making it a solid choice if security is your top priority. The 3.2-foot length is convenient for locking two bikes together or securing your bike to a fixed object, though it might be a bit short if you need to lock around larger structures.

The combination lock has a large number of possible codes (up to 100,000), which means it's very hard for thieves to guess the password. Resetting the code is simple, so you can change it whenever you like without needing a key. The lock also has a protective cover that prevents scratching your bike and helps resist weather damage, plus a dustproof cap to keep dirt out of the lock mechanism, adding to its durability in outdoor conditions.

While the chain is strong, it’s only 6mm thick, which is on the thinner side compared to some heavy-duty locks, so if you park in very high-risk areas, you might want a thicker chain. Also, the lock head diameter is 1.3 inches, so make sure it fits the space where you plan to lock your bike. The lock is relatively lightweight at about 0.73 kg, making it easier to carry than heavier chains but still sturdy enough for most everyday use. This lock is well suited for casual to moderately security-conscious cyclists who want a reliable, keyless lock that’s easy to use and resistant to weather.

The Kryptonite Keeper 785 Bike Chain Lock is a strong contender for those seeking a sturdy bike-chain-lock. Made from 7mm hardened steel, the chain is particularly robust, providing good resistance to cutting and leverage attacks. This makes it suitable for moderate security needs, especially in areas where theft is a concern but not a high risk. The chain is 2.8 feet long, which might be slightly limiting for those needing to secure larger bikes or multiple items. The weight of approximately 2.9 pounds might be a downside for those prioritizing portability.

The lock system is a highlight, featuring a patented disc-style cylinder that is resistant to picking and drilling, adding an extra layer of security. The chain's connection to the hardened deadbolt eliminates weak points, enhancing its anti-theft capabilities. A protective rubber coating and nylon sleeve help prevent scratches on the bike and offer some weather resistance, although it might not suffice in extreme conditions.

An appealing feature is the Key Safe Program, which provides peace of mind by replacing lost keys free of charge, ensuring that you're not left stranded if you misplace them. This feature could be particularly beneficial for those prone to losing keys. However, it's worth noting that the lock is rated 5/10 on Kryptonite's security scale, which suggests it's best suited for areas with a moderate risk of theft rather than high-risk environments. Its stylish design and robust build make it a good choice for cyclists who need reliable security without a high-security demand and don't mind a bit of extra weight. For urban cyclists or those in less secure areas, a more robust option with a higher security rating might be necessary.

The Kryptonite Evolution Mini Bike Chain Lock is a robust and reliable option for securing bicycles, motorcycles, and more. It features a heavy-duty 10mm hardened steel chain with six-sided links, offering high resistance to cutting and leverage attacks. The patented locking system includes a reinforced oval crossbar lock head and a high-security disc-style cylinder that's resistant to picking and drilling.

The chain connects to a hardened deadbolt through a patented end link design, minimizing weak points for enhanced security. This lock is also designed to protect your bike with a durable rubber coating to prevent scratches and a weather-resistant nylon sleeve for added durability. The sliding dust cover extends the life of the cylinder, ensuring long-term use.

Weighing 6.09 pounds and measuring 3 feet in length, it provides a substantial yet manageable security solution. Kryptonite also offers a Key Safe Program, where they will ship replacement keys for free if you lose them, and an optional Anti-Theft Protection Offer covering up to $3,000. The product is backed by a lifetime warranty, reflecting the brand's confidence in its durability and performance. The lock's weight might be a drawback for those seeking a more lightweight option, and the 3-foot length may be limiting for securing larger or multiple items. Despite these minor downsides, the Kryptonite Evolution Mini Bike Chain Lock stands out for its strength, security features, and customer support, making it a reliable choice for users seeking high-level bike security.