Sram XX1 Eagle 12s Rear Derailleur 52t Max LunarThe Sram XX1 Eagle 12s Rear Derailleur occupies 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 all the way to the massive 52t chainring. The type 3 clutch is smoother and more durable and includes a 14T lower pulley. Includes a chain gap tool that makes it easy to set up the correct chain length. Backwards compatible, works with 10-50t and 10-52t cassettes. Updated cage geometry provides better chain retention and crisper shifting. Comes in XX1 Eagle master colorway as part of Eagle Color system.710845853531