SRAM NX Rear Derailleur - 11 Speed Long Cage BlackSRAM NX Rear Derailleur 11 Speed Long Cage Black. NX is SRAMs 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 Specifications: Largest Cog 42 Color Black Rear Der Shifter Compatibility SRAM X Actuation Rear Derailleur Mount Type 10x1 Standard Drivetrain Speeds 11 Weight