Kryptonite Evolution Series 4 Long Shackle U-Lock



This is a strong U lock, perfect for securing your bike in moderate risk areas. It is made from 14mm hardened steel and the internal mechanism has been reinforced to provide increased security from different styles of attacks.

It is vinyl coated so that it does not scratch your frame. A dustcover protects the cylinder and ensures that the lock is weather-proof. Team this with a cable lock for all-bike protection.

As a leader in action sports security and the creator of the original bicycle u-lock in the bicycle security category in 1971, Kryptonite offers premium quality security products.


Bicycle security for moderate to high crime areas, with an extra-long shackle

14mm hardened Kryptonium steel shackle

Patented double deadbolt locking mechanism for extensive holding power

High security ovalised cylinder

Reinforced sleeve over crossbar and cylinder provides enhanced security protection

Reinforced internal housing increases resistance to twisting and leverage type attacks

Offset key location and overhead cam locking mechanism resists leverage attacks

Double deadbolt locking for extra strength against leverage attacks

Anti-rattle bumpers keeps the shackle snug against the crossbar and prevent unnecessary noise

3 keys, including 1 lighted

The Transit Flex Frame-U mounts quickly and easily and supports the transportation of the most common u-lock sizes

The Flex Frame-U fits bicycle frame tubing 25mm to 80mm whether round, oval, triangular or square shapes

The mounting system allows for 360-degree rotation providing the ability to micro-adjust the lock angle to better fit and align with a bike frames specific geometry

Rotating dust cover over cylinder protects from dirt & grime

Vinyl coated and weather-proof

U-lock dimensions: 10.2cmx29.2cmx14mm

Approved to bicycle Gold Sold Secure standard

Approved to Thatcham CAT3


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