Sram brings you the XX1 Rear Derailleur Type 21, designed for maximum impact. The horizontal parallelogram design and pulley offset of the X-HORIZON keep the chain gap consistent across all 11 gears, ensuring fast and precise shifts. This design limits movement to the horizontal axis, resulting in quicker shifts, reduced shift force, and the elimination of ghost shifting. The Roller Bearing Clutch technology reduces bounce and chain slap, while the Cage Lock technology makes wheel removal and installation easier than ever. When paired with the XX1 shifter, the X-HORIZON Rear Derailleur plays a crucial role in X-ACTUATION technology, delivering unbelievably smooth shifting action.