Sram Force 1 Type 2.1 Rear Derailleur Mid Cage GreyThe Sram Force 1 Type 2.1 Rear Derailleur has an option of mid or long cage and has been optimized with its new Roller Bearing Clutch Design for 2015! This 11 speed cyclocross component features SRAM’s X-SYNC pulley with a 12 tooth integrated chainwheel to assist with the lateral motion. The Roller Bearing Clutch keeps the chain tension constantly even to increase the consistency while shifting. SRAM’s Exact Actuation is constantly being upgraded with every bit of new information that is collected from field testing to be supremely fast and accurate. The mid cage model is compatible with up to 36 teeth and the long cage model is compatible with up to 42 teeth. Weighs only 261 grams.710845764271