Rival 1 Rear DerailleurDescription 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 shifts faster, reducing shift effort and chain slap. Features 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