SRAM GX Rear Derailleur - 11 Speed Long Cage Black 1x With ClutchSRAM GX Rear Derailleur 11 Speed Long Cage Black 1x With Clutch. GX derailleurs share the key features of higher priced models and are available for 1x11 and 2x11 drive trains. TECH SPECS Rear Derailleur Mount Type 10x1 Standard Rear Der Shifter Compatibility SRAM X Actuation Cage Length Long Drivetrain Speeds 11 Weight 256 Color Black Chain Wrap Capacity (teeth) 32 Largest Cog 42