An industry-leading 10- to 51-tooth cassette crowns Shimano’s latest, customizable mountain bike groupset.
With the front derailleur all but dead in the mountain bike world, component manufacturers now race to cram more gears in the rear. And today Shimano set the bar just a bit higher with the launch of its XTR 9100 series groupset.
The component upgrade includes everything – disc brakes, shifters, derailleurs, crankset, hubs, and more. But the crown jewel has to be Shimano’s first 1×12 drivetrain, with a massive 10- to 51-tooth cassette. And for those keeping score, that gives the Japanese brand one more tooth than SRAM’s 10- to 50-tooth XX1 Eagle cassette.

Shimano XTR 9100: 1×12 MTB Drivetrain
According to Shimano, the new line arose out of “extensive feedback from its global mountain bike athletes.” It aims to deliver semi-customizable gruppos depending on rider preference.
