The innovative IvyTex cover is dirt and moisture repellent and even better: It helps to increase protection as the synthetic material slows down the penetration of cutting tools. Underneath is a square profile chain made of hardened steel alloy. The chain can be connected to a number of ABUS frame locks. It serves as additional security, for example to chain the bike with pre-mounted frame lock to a fixed object. An additional key is not necessary for the plug-in chain. The spoke lock key opens and locks both components.