Shimano xtr m9000 shadow 11 speed rear mechwith a refined shadow rd plus clutch rear derailleur a new front derailleur structure and a new xtr chain cn hg900 11 m9000 offers the most stable drivetrain the industry has ever seena new shadow design optimizes the slant angle lowering shift effort while improving shifting and driving stability while the derailleur is even lower profile protected further from harms way the new shadow plus clutch has a simpler external clutch adjustment and