The Shimano Deore XT RD-M8200 rear derailleur brings tough, reliable 12-speed mechanical shifting to hard trail riding, with two setup options to match your drivetrain. Pair it with a 10-51T cassette for a huge 510% gear range, or choose the compact mid-cage version with a 9-45T cassette for lighter weight, 23mm more ground clearance, and a strong 500% range. Its low-profile, wedge-shaped design helps avoid impacts, while an internal spring absorbs hits and returns the derailleur to position. The updated cage and solid pulley help clear trail debris for fast, dependable shifting.