Sram Accessory Rear Derailleur Rival Long Cage 11-Speed BlackFeatures A dedicated SRAM 1x rear derailleur Exact Actuation for fast and accurate shifts using SRAM's 1: 1 actuation ratio (shifter cable travel: derailleur movement) X Sync pulley features a 12 tooth design that helps control the chain's lateral movement Roller Bearing Clutch controls chain tension for consistent shifting X Horizon straight parallelogram design limits all movement to the horizontal axis, which makes ghost shifting impossible while