Precision engineered XTR Shadow Dyna-Sys 10-speed rear derailleur for the ultimate in shifting performance and durabilityShimano's new Direct Mount Rear Derailleur system gives more space around the rear frame dropout resulting in easier rear wheel removal but also allows frame designers to shorten chain stays, increase axel sizes and move suspension pivotsDirect Mount gives a simpler, cleaner lookShadow features a super low profile design that reduces the risk of damage from trail side hazardsSingle tension spring prevents contact with the chainstay resulting in a silent rideDirect cable routing prevents snagging from any trail side hazardsFull carbon fibre outer pulley cage saves weight while alloy inner cage increases rigidityCold forged alloy links and pivot body's with carbon composite P-bodyFour fluorine-coated link pin bushingsHigh rigidity wide outer link braces the pulley bodyStrong return spring for a positive shifting feelImproved cable pull ratio provides a more accurate shift actionDyna-Sys 10-speed compatible onlyDurable sealed bearing pulleys for low frictionTop normal spring uses the spring to select higher gears35T capacity GS cage