SRAM S200 Eagle Rear Derailleur - 12-Speed, Long Cage, 52t Max, Black, B1Eagle set the standard for wide range 1x, and the S200 derailleur is the workhorse that continues that legacy. Confidently mix and match across the Eagle Drivetrain Ecosystem with compatibility for both 500 and 520% Eagle cassettes. And never be held back as the proven Type 3 clutch brings confident chain retention and quiet descending. Backwards compatible, works with both 10 50t and 10 52t Eagle cassettes X Actuation for use with Eagle Drivetrain