SRAM REAR XX1 EAGLE 12s LUNAR GY 52TOccupying a new realm in shifting performance, the redesigned XX1 Eagle derailleur gives no compromise racers and dream bike builders a true top tier option Updated cage geometry provides better chain retention and crisper shifting Backwards compatible, works with 10 50t and new 10 52t cassettes Comes in XX1 Eagle master colorway as part of Eagle Colorsystem to go with all cassette and chain color options Black, Gold, Rainbow, HardChrome and all new