Shimano xtr m9000 11sp rear derailleurthis shimano xtr m9000 shadow 11 speed rear mech features a refined shadow rd plus clutch rear derailleur, a new front derailleur structure and a new xtr chain cn hg900 11, to offer industry leading drivetrain stability.improved shiftingthis xtr rear derailleur has shimano's shadow design, which optimises the slant angle to lower shift effort'. '.strtoupper('i')n turn, the xtr rear derailleur has improved shifting and driving stability as the derailleur's low profile delivers protection from harms way'. '.strtoupper('t')he new shadow clutch has a simpler external clutch adjustment, and the shimano xtr m9000 shadow 11 speed rear mech has a wider range of adjustment for easier setup.features maximum front difference 10tmaximum low sprocket 40tfull carbon fibre outer pulley cage saves weight while alloy inner cage increases rigiditycold forged wide alloy links and pivot bodyfour fluorine coated link pin bushingsxtr shadow dyna sys 11 speed rear derailleur for the ultimate in shifting performance and durabilityshadow features a super low profile design and optimized slant angle for super light shifting actionshadow uses a chain stabilising switch that when on will reduce chain bounce in rough terrain maintaining more stable drive and shiftingsingle tension spring prevents contact with the chainstay resulting in a silent ridedirect cable routing prevents snagging from any trail side hazardsstrong return spring for a positive shifting feelimproved cable pull ratio provides a more accurate shift actionspecifically designed to work with xtr m9000 11 speed dyna sys 11 40t cassette and drivetraindurable sealed bearing pulleys for low frictiontop normal spring uses the spring to select higher gears37t capacity gs cagea 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace and xtr products.buy shimano components from chain reaction cycles, the world's largest online bike store.