SRAM GX Type 2.1 1x11 Speed Long Cage Rear Derailleur Red MTB 11 SpeedGX derailleurs share the key features of higher priced models and are available for 1x11 and 2x11 drive trains. 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 Item Specifications Cage Length Long Chain Wrap Capacity (teeth)