TheSRAM NX 11 Speed Rear Derailleurprovides the same smooth, reliable shifting action as XX1—from the larger upper pulley offset to the 12-tooth X-SYNC™ pulley wheels. By eliminating unwanted chain movement, X-HORIZON™ shifts faster, puts an end to ghost shifting and reduces shift force and chain slap. And with CAGE LOCK™ technology, wheel removal and installation are easier than ever. SRAM NX 11 Speed Rear Derailleur Features X-Horizon design that reduces shift force, ghost shifting and chain slap 12-tooth X-Sync pulley wheels Fully compatible with all SRAM 1x drivetrains Most affordable fully featured 1x rear derailleur in the industry