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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. X-HORIZON Design 12-Tooth X-SYNC Pulley WheelsMost Affordable Fully Featured 1x Rear Derailleur Available