The SRAM XX1 Eagle rear derailleur in Lunar Black is the long-cage, cable-actuated 12-speed model. Updated cage geometry supports both 10–50T and 10–52T Eagle cassette options.
X-Actuation shifting, the Roller Bearing Clutch and Cage Lock form its operating features. The listed chain wrap capacity is 42T. Match it to a compatible SRAM mountain 12-speed shifter; this is the complete rear derailleur, not a replacement cage or an AXS unit.






