Best Kryptonite Bike U Locks in 2026

14mm hardened MAX-Performance steel shackle resists both cutters and leverage attacks

Double deadbolt locking mechanism has extensive holding power

High security, disc-style cylinder with reinforced anti-drill, anti-pull protection system

【Premium Heavy Duty Bike Lock】 This bike lock comes with a 0.86 inch heavy duty shackle and has excellent heat resistant and hydraulic shear resistant. Equipped with a 0.10 inch silicone cover, it can prevents scratch well and provides excellent safety protection for your bicycle.

【Security and Anti-theft】The bicycle lock is built-in imported c grade pure copper look cylinder, which is certified to resist leverage attacks and provides excellent anti-theft performance, so that your bicycle can be protected with the best safety.

【Easy to Install and Use】The combination bike lock is equipped with a 0.45 inch diameter thick steel cable with a length of 4ft and a high-quality mounting bracket, allowing you to easily install and use it without additional tools. It is very user-friendly.

More Convenient U-LOCK - From the makers of OTTOLOCK, the SIDEKICK brings innovation to the traditional U-Lock with a compact, lightweight design that effectively deters opportunity theft without weighing you down. Simple to use and to carry, the portable SIDEKICK easily fits in many backpacks, bags, or pockets.

Lightweight Bike Lock - At only 750 grams (1.65 lbs), the SIDEKICK allows you to lock a single tube to a post or pole at a fraction of the weight of a traditional U-Lock. The opening measures 2.75” x 5.75” (7cm x 14.5cm). Each lock comes with 3 keys

Protect Your Frame - The body of the SIDEKICK is coated in high quality silicone that won’t scratch or damage your bike frame. Made with double-shackle 12mm hardened steel and an antirotation deadbolt for security and durability.

This High Performance Folding Lock is made of special 3mm thick hardened ABS Steel bars and is uncuttable to provide Maximum Security for your bike in any location!

This folding bicycle lock can easily mount to your frame, it's light weight design makes it secure and easy to ride with. Better than any other chain, cable, combination u lock accessories out there!

4-Digit resettable combination lock system. This foldable keyed bike lock is comparable to top brands such as kryptonite, abus, etronic, sigtuna, Amazon and seatylock.

【 High Quality U Lock】:ROCKBRO bike U lock is made of 0.84inch (21.4mm)alloy steel( including 0.36inch silicone cover). The Lock features zinc alloy C grade lock cylinder, Which is leveraging-resistant, cutting-resistant, and drill-resistant. Also, the lock is able to resist 12 tons of cutting force. Even a smart thief , cannot do anything about it

【 Loop Cable &Versatile Use】:Comes with a 3.94 ft double looped ends steel cable, which has t PVC shell. The whole diameter of the cable is 0.39inch. There are 3 rust-resistant copper keys that have complex serpentine slots, keys are not easy to be coppied. This lock is strong to keep your bike ,sccoter or motorcycle safe

【Fully Protection】: This bike lock features a hardened steel body and double locking shackle for superior cutting and prying resistance. The lock crossbeam has passed multiple quenching heat treatment processes to improve the hardness and strength, effectively resist any violent damage