Evolution series-4 ls with flexframe bracket

Updated 2026-09-05

The Evolution Series-4 LS features a long 14mm hardened steel shackle, measuring 4 in by 11.5 in, providing ample space for difficult locking situations. This extra length is ideal for securing your bike to large diameter poles or reaching through both the frame and rear wheel. The 14mm thickness offers significant resistance against bolt cutters.

This lock utilizes a patented double deadbolt design, which secures both ends of the shackle for maximum holding power. The high-security disc-style cylinder is engineered to be pick and drill resistant, providing a high level of confidence in high-risk areas. A protective vinyl coating is applied to the shackle to prevent scratching your bicycle.

Included with the lock is the Transit FlexFrame-U bracket, which allows for multiple mounting positions on the bike frame for easy transport. Three stainless steel keys are provided, including one with a high-intensity LED light. This model is a top-tier choice for cyclists who require a large, heavy-duty lock with a reliable mounting system.

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