* SRAM Road 10- and 11-speed compatible* Exact Actuation㢠for fast and accurate shifts using SRAMÛªs 1:1å¨ actuation ratio (shifter cable travel : derailleur movement)* X-Sync㢠pulley features a 12-tooth design that helps control the chainÛªs lateral movement* Roller Bearing Clutch㢠controls chain tension for consistent shifting* X-Horizon㢠straight parallelogram design limits all movement to the horizontal axis, which makes ghost shifting impossible while also reducing shift force* Cage Lock㢠technology makes for fast wheel changes or chain installation