SRAM XX1 Eagle Rear Derailleur - 12-Speed Long Cage 52t Max Lunar. Occupying its rightful place at the top of the Eagle ecosystem the XX1 Eagle rear derailleur gives no-compromise racers and dream-bike builders a true top-tier option. The crisp precise XX1 shifting feel athletes rely on features an updated cage geometry for improved chain management.

Type 3 clutch is smoother and more durable

14T lower pulley

Includes a chain gap tool that makes it easy to set up the correct chain length