NX, Rear derailleur, 11sp., Long cage, Black

* 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* X-HORIZON, X-SYNC, X-ACTUATION, CAGE LOCK, and ROLLER BEARING CLUTCH technologies* SRAM Model ID: RD-NX-1-A1