SRAM GX rear derailleur takes the place of X.9 and X.7 10-speed models and provides shifting speed and precision. Exact Actuation technology eliminates slop and shifting variation Roller Bearing Clutch delivers maximum drivetrain stability even through the most punishing terrain Rear Derailleur Mount Type: 10x1 Standard Drivetrain Speeds: 10 Weight: 234 g Rear Der/Shifter Compatibility: SRAM Exact Actuation