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 Item Specifications Cage Length Long Chain Wrap Capacity (teeth) 32 Color Black Drivetrain Speeds 11 Largest Cog 42 Rear Der Shifter Compatibility SRAM X Actuation Rear Derailleur Mount Type 10x1 Standard