Kryptonite Evolution Series-4 Chain Bicycle Lock

Kryptonite’s 8/10 rating indicates this lock is designed for high-theft areas and longer lock-up times. It is Sold Secure Gold certified, meaning it has been independently tested to withstand sustained attacks from common tools like bolt cutters and hacksaws.

At 10mm thick, this chain offers significant security but does add noticeable weight to your ride. Most users find the best way to carry it is by wrapping it securely around the seat post or carrying it in a dedicated bike bag.

Yes, the durable nylon sleeve acts as a buffer between the hardened steel chain and your bike's paint. It prevents the metal links from scratching or chipping your frame while you are locking up.

Kryptonite offers a Key Safe Program where you can register your key number online immediately after purchase. If you lose your keys, they can ship replacements to you, provided you have registered the code.

The lock is designed to be weather-resistant and features a sliding dust cover to keep debris and moisture out of the cylinder. While it is built for outdoor use, applying a silicone-based lubricant to the cylinder once or twice a year will keep the mechanism operating smoothly in harsh conditions.

By securing the chain directly to the deadbolt, this design eliminates the 'weak link' often found where a separate padlock meets a chain. This integrated approach removes the possibility of an attacker using leverage to pry the lock open at the connection point.