SRAM's GX 1x11 X-Horizon rear derailleur is engineered for smooth, reliable shifting action--from the larger upper pulley offset to the 12-tooth X-Sync pulley wheels. By eliminating unwanted chain movement, this X-Horizon rear derailleur shifts faster, puts an end to ghost shifting, and reduces shift force and chain slap. And with Cage Lock technology, wheel removal and installation are easier than ever. For 1x11 speed drivetrains Type 2.1 roller bearing clutch in the pulley cage pivot for better chain control X-HORIZON design reduces shift force, ghost shifting and cage slap Cage Lock mechanism for easy wheel changes Sealed cartridge bearings Aluminum cage and steel pulleys Rear Derailleur Mount Type: 10x1 Standard Drivetrain Speeds: 11 Cage Length: Long Chain Wrap Capacity (teeth): 32 teeth Largest Cog: 42 Weight: 256 g Rear Der/Shifter Compatibility: SRAM X-Actuation