Features of the SRAM GX Type 2.1 10-Speed Short Cage Rear Derailleur 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 Cage Length, Short Chain Wrap Capacity (teeth), 30 Drivetrain Speeds, 10 Rear Der/Shifter Compatibility, SRAM Exact Actuation Color, Black Weight, 234 Largest Cog, 36