This is the new XTR. This is what 27 years of development looks like and Shimano are right back to where it all started- introducing the ultimate MTB race components. Designed to meet the highest level competitive mountain bike racing needs with a second to none performance and experience. The XTR M9100 series offers the most versatile groupset for XC, enduro and marathon racing. Superior shifting and and decreased tension makes XTR the first choice for performance and efficiency. The all-new Shimano XTR M9100 series of derailleurs brings a new level of drivetrain silence thank to decreased tension in the low gear position and an added bumper on the pulley cage. Larger 13T pulleys increase efficiency and chain management while compatibility with Shimano’s new 12-speed cassettes boosts range.