Shimano XT Shadow plus 12-speed rear derailleur for fast and precise shifting performance optimized to take on any trail. Shadow plus features a super low profile design and optimized slant angle for super light shifting action. Shadow Plus uses a chain stabilising switch that when on will reduce chain bounce in rough terrain maintaining more stable drive and shifting. Single tension spring prevents contact with the chainstay resulting in a silent ride. Rubber bumper on pulley cage for added silent drive. 13T pulleys and decreased derailleur tension prevent high chain tension in low gears. Direct mount. Works with Shimano 1x12 drivetrains - cross compatible with Deore M6100, SLX M7100, and XTR M9100 cassettes and shifters. Large 13T pulleys, strong clutch and return spring. Max low sprocket 51T.