SRAM GX 1x11 Speed Long Cage Rear Derailleur BlackGX derailleurs share the key features of higher priced models and are available for 1x11 and 2x11 drive trains. Roller bearing clutch in the pulley cage pivot for better chain control Cage Lock mechanism for easy wheel changes Item Specifications Color Black Weight 256 Largest Cog 42 Chain Wrap Capacity 32 Cage Length Long Drivetrain Speeds 11 Rear Der Shifter Compatibility SRAM X Actuation Rear Derailleur Mount Type 10x1 Standard