performance advantage you have come to expect from Sram. The derailleur is designed with our Exact Actuation&153; technology for precise, efficient shifting. We have paid special attention to the finer details, like adding a hollow titanium anchor bolt & even refining tooth geometry of thejockey wheel. The result is that the chain runs through the new Sram Red 22 Rear Derailleur smoother & quieter than ever before. Exact Actuation&153; shifting provides fast, & accurate True 22 shifts. More clearance with 28t cassettes thanks to a longer B-knuckle. New silent shifting with optimized Aeroglide Pulleys&153;, ceramic bearings. New spring-fixed barrel adjuster. New chain pulley cage adds precise chain management. Titanium pinch bolt keeps a low profile while minimizing weight. Wi F Li option Weight: 145g Compatibility: SRAM Red 22 & Force 22 Rear Shift/ Brake levers