SRAM GX 2x11 Speed Long Cage Rear Derailleur BlackGX derailleurs share the key features of higher priced models and are available for 1x11 and 2x11 drive trains. For 2x11 speed drivetrains Type 3 roller bearing clutch delivers maximum drivetrain stability, even through the most punishing terrain X ACTUATION technology eliminates slop and shifting variation Cage Lock mechanism for easy wheel changes Aluminum cage and steel pulleys Item Specifications Cage Length Long Chain Wrap Capacity (teeth) 46