SRAM GX Rear Derailleur - 11 Speed Long Cage Red 1x With ClutchSRAM GX Rear Derailleur 11 Speed Long Cage Red 1x With Clutch. GX derailleurs share the key features of higher priced models and are available for 1x11 and 2x11 drive trains. TECH SPECS Largest Cog 42 Color Red Rear Der Shifter Compatibility SRAM X Actuation Rear Derailleur Mount Type 10x1 Standard Drivetrain Speeds 11 Weight 265 Chain Wrap Capacity (teeth) 32 Cage Length Long