MRP 1x SL Chainguide - 30-36t Trek BB992 Clamp-On Mount Aluminum Backplate Model MY SpecificMRP 1x SL Chainguide 30 36t Trek BB992 Clamp On Mount Aluminum Backplate Model and MY Specific. One dropped chain is one too many. Eliminate dropped chains forever so you can ride without interruption. The MRP 1x SL chainguide incorporates a stiff aluminum backplate and easy to use setup and adjustment features. TECH SPECS Color Black Mount Type BB Mount Chainguide Mount Type BB Cup Mount Material Aluminum Material Composite Defined Color Black Max