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SRAM XX1 Eagle Rear Derailleur 12 Speed 10-50T Type 3 Black model-centouno Specialized S-Works Enduro Limited EditionWhen every gram counts, SRAM XX1 Eagle is the way to go. This rear derailleur is only compatible with the SRAM XX1 shifter and cassette for unparalleled reliability and weight savings. The XX1 Eagle drivetrain was built to dominate cross country races and bring race technology to consumers.