XTR Shadow plus Dyna-Sys 11-speed rear derailleur for the ultimate in shifting performance and durability Direct Mount gives a simpler, cleaner look 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 Direct cable routing prevents snagging from any trail side hazards Full carbon fibre outer pulley cage saves weight while alloy inner cage increases rigidity Cold forged wide alloy links and pivot body Four fluorine-coated link pin bushings Strong return spring for a positive shifting feel Improved cable pull ratio provides a more accurate shift action Specifically designed to work with XTR M9000 11-speed Dyna-Sys 11-40T cassette and drivetrain Durable sealed bearing pulleys for low fricti