The ABUS ACH Classic Adapter Chain provides a secondary layer of security when used with an existing frame lock. This hardened steel chain allows cyclists to tether their bicycle to a fixed object such as a lamppost or fence. It functions as a convenient extension that increases the range of locking options for urban or short term storage.

The system works by looping the chain around an anchor point and inserting the locking bolt into the frame lock housing. This setup eliminates the need for a separate key for the chain while maintaining a secure connection. The black fabric sleeve protects the bicycle frame from scratches and impact damage during daily use and transport.

Quick Facts

Feature	Specification
Thickness	5.5mm
Bracket Included	No