SRAM NX 1x11 Rear Derailleur - Long CageSRAM NX 1x11 Rear Derailleur Long Cage The SRAM NX Rear Derailleur provides the same smooth and reliable shifting action as the exceptional XX1 shifters, thanks to the larger upper pulley offset to the 12 tooth X SYNC pulley wheels. The X Horizon design shifts faster, eliminates ghost shifting and reduces shift force and chain slap and the CAGE LOCK Technology makes wheel removal and installation easier than ever. Fully compatible with all SRAM MTB 1x