SRAM GX Eagle AXS Rear Derailleur - 12-Speed Long Cage 52t Max Lunar. Not only does the SRAM GX Eagle AXS Rear Derailleur get the job done it features everything you have come to expect from SRAM's AXS connect components . It's able to shift on command whether that's under climbing load or sprinting to the stage finish. The derailleur is smart enough to protect itself thanks to its incredibly resilient Overload Clutch. Engineered with a variety of rider preferences in mind it is compatible with the expanded range 10-52t cassette as well as the 10-50t cassette.AXS enabled componentry software makes it possible to both program and personalize SRAM and RockShox components with Eagle technologyOverload Clutch protectionFinished with the GX Eagle master colorwayBattery sold separatelyDerailleur features a steel cage and steel pulley bearings