SRAM X01 Rear Derailleur - 11-Speed Medium Cage Black

Competition grade derailleur built with carbon fiber and aluminum featuring roller clutch pulley cage and cage lock feature for easy wheel installation. X-Horizon design is specific to single-chainring drive trains.Wide-tooth narrow-tooth pulley wheel maximizes chain control by fitting inner and outer chain links perfectlyX-Horizon design maintains constant chain gap across all gears and eliminates ghost shiftingRoller bearing clutch eliminates derailleur bounce and chain slapCage Lock feature simplifies wheel removal and chain installationMust be used with SRAM 1x11 shifter and cassetteCannot be used with double or triple chainrings