Shimano's XT M8000 11-speed cassette is the key to taking full advantage of the Dyna-Sys 11-speed system. This cassette is specifically designed with a wide gear combination and carefully balanced ratios for you to find that perfect gear on the trail. Through its carefully-calculated Rhythm Step gear progression, the XT M8000 Cassette decreases "shock" and lost power as you shift gears, ultimately delivering smoother and more precise gear changes.