Your needs aren&';t less demanding, they&';re different. The SRAM Rival 1 rear derailleur is engineered for smooth, reliable shifting action, delivering 100% of what you demand. By eliminating unwanted chain movement, X-HORIZON(TM) shifts faster, reducing shift effort and chain slap. Features A dedicated SRAM 1x(TM) rear derailleur Exact Actuation(TM) for fast and accurate shifts using SRAM&';s 1:1A(R) actuation ratio (shifter cable travel : derailleur movement) X-Sync(TM) pulley features a 12-tooth design that helps control the chain&';s lateral movement Roller Bearing Clutch(TM) controls chain tension for consistent shifting X-Horizon(TM) straight parallelogram design limits all movement to the horizontal axis, which makes ghost shifting impossible while also reducing shift force Cage Lock(TM) technology makes for fast wheel changes or chain installation Specifications Speed (RD) 11 Cable pull ratio Exact Actuation Cage (RD) Long, Medium Max tooth 36, 42 Color (RD) Black Pulley bearings material Steel Cage material (RD) Aluminum Drivetrain Configuration 1x RD Minimum (Cassette) 25, 36 Communication Protocol n/a Shift Technology Exact Actuation Chain Technology 11 Speed Powerchain