SRAM NX Rear Derailleur - 11 Speed Long Cage BlackNX is SRAM's 1x drive train for the masses. All the key functionality features of high end 1x derailleurs are built in. X Horizon geometry Same roller clutch and CageLock features as high end models Cannot be used with double or triple chainrings Largest Cog 42 Color Black Rear Der Shifter Compatibility SRAM X Actuation Rear Derailleur Mount Type 10x1 Standard Drivetrain Speeds 11 Weight 322 Chain Wrap Capacity (teeth) 32 Cage Length Long