Best Heavy Duty Bike Chain Locks of 2025

The Kryptonite Keeper 712 Integrated Chain Lock is a high-security bike lock with 7mm four-sided chain links made from 3t manganese steel. Its patent-pending end link design secures the chain to a hardened deadbolt, providing extra holding power and eliminating critical vulnerability. The disc-style cylinder is pick and drill resistant, while the weather-resistant nylon sleeve protects the chain against scratches and the elements. With a 48-inch (120cm) chain length, it is a flexible, compact, and easy-to-use deterrent security.

The Kryptonite Keeper 785 Integrated Bicycle Lock Chain comes in three new colors and is made from 7mm four-sided chain links using 3T MANGANESE STEEL, with a patent-pending END LINK DESIGN that secures the chain to a hardened deadbolt, eliminating critical vulnerability. It features a hardened DEADBOLT DEDSIGN for extra holding power, and a HIGH SECURITY DISC-STYLE CYLINDER that is pick and drill resistant. The lock also comes with 2 NEW ERGONOMIC "I" KEYS and a durable WEATHER-RESISTANT nylon sleeve to prevent scratches. The chain length is 33.5” (85cm).

The Sportneer Bicycle Chain Lock is a 5-digit resettable combination anti-theft bike lock made from extra thick manganese steel for cut resistance and protective zinc-plated coating. It is 3.2 feet long, ideal for bicycles, bike, ladders, lawnmowers, gates, fences, tool boxes, bbq, sport equipments and more. It is keyless secure lock mechanism with up to 100,000 possible codes, making it nearly impossible to crack. It is also waterproof and dustproof with a flexible cloth sleeve which covers the chains to protect it from being scratched and sawed.

Titanker Bike Chain Lock is a heavy-duty anti-theft bicycle chain lock made of 6mm thick security heavy-duty steel chain links. It comes with a protective cloth sleeve and dust cover to protect the chain from rust and scratches. The overall length of the chain lock is about 3 feet and the lock weight is 1.4 pounds. Ideal for bicycles, ladders, lawnmowers, stroller, scooter, fences, tool boxes, sport equipment and etc.

The Kryptonite Keeper 790 7mm Chain Combo Lock is a durable bike lock with an end link locking point for strong holding power, 4-sided 3t manganese steel chain links, and a 4-digit resettable combination with over 10,000 possible codes. The lock has a universal fit and is ideal for cycling enthusiasts who want to secure their bike safely.

The NDakter Bike Chain Lock is a heavy-duty, 5-digit combination lock that provides excellent security for your bike, scooter, motorcycle, or other valuable items. The lock cylinder is made of zinc alloy, making it hard to break through, while the 0.27 inch alloy steel chain is drill-resistant and anti-tech unlocking. The lock is wrapped in scratch-proof polypropylene fabric, which protects the chain and prevents it from scratching your bike frame. With a code design, you don't have to worry about carrying keys, and the lock is resettable with 10,000 possible combinations. The chain is 3.2 feet long, making it suitable for locking multiple bikes together or securing your bike to a tree, gate, fence, or other fixed object. NDakter provides a one-year warranty, and the lock is backed by excellent customer reviews.

The Kryptonite Evolution 1090 Bike Chain Lock features a new patent-pending design that secures the chain to a hardened deadbolt, eliminating any weak links due to the extensive holding power of the link itself against attacks. The 10mm six-sided chain links are made of 3t manganese steel, and the high security disc-style cylinder is pick and drill resistant. The weather-resistant nylon sleeve prevents scratches, and the compact coiling makes it easy to carry. The lock comes with 3 stainless steel keys, including one with a high-intensity LED bulb for easy unlocking in the dark.

The BIGLUFU Motorcycle Lock offers impressive security features for your bike and other valuables. Made from unbreakable manganese steel, the 10mm thick chain is highly resistant to cuts, ensuring your items are safe from theft. The lock is covered in a scratch-proof nylon sleeve, protecting your property from any damage while locked. Additionally, the sturdy U lock, with its thick zinc alloy shackle, resists cutting and leverage attacks. With four durable keys designed for easy use, you'll find that this lock is both tough and user-friendly, making it a smart choice for securing your motorcycles, lawn equipment, and more.

The Windone Bike Lock offers robust security for your bicycle or motorcycle. Its hardened steel chain links resist cutting and sawing, giving you peace of mind against theft. To protect your bike’s finish, the lock features an anti-scratch sleeve that also guards against rust. The convenient 4-digit combination lock allows you to set a personalized code, making it easy to secure your belongings without fumbling for keys. Additionally, the lock’s high-security mechanism deters tampering, ensuring your items stay safe in various environments.

The Grentay Bike Chain Lock offers top-notch security for your bicycle. Its heavy-duty construction, made from alloy steel and designed to resist cutting, ensures your bike remains safe from thieves. The 5-foot length provides flexibility, allowing you to lock your bike to various objects like bike racks or trees with ease. The U-lock design features a high-quality lock core that prevents unauthorized access, giving you peace of mind. Plus, the included dust cover helps prolong the lock's lifespan, ensuring you get lasting protection.