XTR 12-speed M9100 hosts a whole load of new technology keeping at the forefront of front derailleurs, it\'s truly the elite racers choice Designed specifically with modern trail bikes in mind, Shimano\'s XTR side swing technology front derailleur allows for fitment to 48.8 and 51.8 mm chainline Side swing - side pull front derailleurs allow bike manufactures to continuously push frame design without limitation Light alloy cage reduces weight and improves performance, nickel-plated finish prevents chain wear Developed specifically for double chainsets and frames with a direct mount Side pull cable routing 38T maximum top gear 12-speed design - for use with Shimano 12-speed drivetrains