GX 1X11, Rear derailleur, 1X11sp., Long cage, Red

* X-Actaution for precise and dependable 11-speed performance* X-HORIZON design reduces shift force and ghost shifting* TYPE 2.1 technologies: ROLLER BEARING CLUTCH and CAGE LOCK* 12-tooth X-SYNC™ pulley wheels* Large upper pulley offset automatically adjusts chain gap* SRAM Model ID: RD-GX-1-A1