The xtr m9100 series derailleurs bring a new level of transmission silence thanks to reduced tension on low gears and extra protection on the clevis. larger 13t rollers increase efficiency and chain management, while compatibility with the new shimano 12-speed cassettes expands the possibilities.・Improved shifting reliability and efficiency "Optimized for the new transmission system・Noiseless transmission "Reduced rear derailleur tension on larger cassette sprockets "Addition of a stop at the rear derailleur clevis to improve operating silence "Larger 13 T roller・Compact profile-Rear derailleur SHIMANO SHADOW RD+・For more aggressive riding "+28 mm ground clearance (compared to RD-derailleurM9100-SGS)・Combination with large sprockets "10-45T (12 speeds)Type: Direct drive (Shadow +)Clevis: GSPackaging: Individually wrapped