Modified to work seamlessly with 3x 11 drivetrains, the XTR M9001 has specially designed teeth that effortlessly engage with your chain to make for the most fluid operation during low-gear riding. Designed with Shimano's Rhythm Step progression, shock-free & measured stepping is maintained as you move up & down the gears to conserve energy & momentum for when you need it most on the downhill, the uphill or on the flats. Equipped with four Carbon Fibre carriers and six Titanium sprockets, XTR M9001 11 speed Cassette performs brilliantly as Shimano's lightest ever 11-speed Dyna-Sys MTB cassette.