The RD-M8200 is Shimano's most capable Deore XT mechanical rear derailleur yet, built for all disciplines. The low-profile wedge design reduces trail impacts, and an internal spring absorbs hits from rocks and roots, returning the derailleur to position. The Long Cage version has a 510% gear range and covers everything from enduro racing to all-day rides. The Medium Cage (GS) has a 500% gear range, making it an ideal choice for both weight-conscious racers and everyday riders. Features Shadow ES: A slimmer, stronger evolution of Shimano's pioneering chain-stabilizing Shadow concept, with a wide link structure for durability Wedge-Shaped Design: Made to move out of the way to absorb trail impacts for a worry-free ride Covered Pulleys/Cage: The solid pulley and shielded pulley teeth prevent trail debris from jamming up your flow Specs Model: Deore XT M8200 Model ID: RD-M8200-GS, RD-M8200-SGS Rear Speeds: 12-Speed Cage Length: Medium (GS), Long (SGS) Min Tooth: 9t (Medium Cage), 10t (Long Cage) Max Tooth: 45t (Medium Cage), 51t (Long Cage) Drive Config: 1x Mount Interface: Derailleur Hanger Shift Technology: Mechanical (cable-actuated) Compatibility The Shimano Deore XT M8200 Rear Derailleur is backward compatible with previous generation Shimano 12-Speed components. Compatible models include: XTR M9100 and M9200, Deore XT M8100 and M8200, SLX M7100, and Deore M6100, M6200 and M7200. The Deore XT M8200 Rear Derailleur is compatible with the following: Frame: Modern framesets via a derailleur hanger, including the Universal Derailleur Hanger (UDH) Cassette: 9-45t (Medium Cage - GS), 10-51t (Long Cage - SGS) Chain: 12-speed HG: XTR M9100 , Deore XT M8100 , SLX M7100 , Deore M6100