The SRAM X01 X-Horizon Rear Derailleur lets you run 1x11 gearing without going bankrupt, plus it packed with technology borrowed from XX1 to give you fast, precise and smooth shifting action. Straight parallelogram design and pulley offset keeps the chain gap constant across all 11 gears to increase shifting speed, reduce shifting force and eliminate ghost shifting. Roller Bearing Clutch technology reduces chain bounce and chain slap for fluid, consistent and reliable gear changes. Cage Lock technology makes wheel removal and installation easier than any other derailleur on earth. When paired with the X01 Shifters, this rear derailleur forms the backbone of X-Actuation technology for unbelievably smooth shifting action.