Shimano's new XT M8100 12-speed Cassette is a beast! With Shimano's Hyperglide+ shift technology, you get the smoothest, most precise shifting in all riding conditions. Not only seamless both up and down the cassette, but this also allows riders to shift under load more confidently. If you want to think less about shifting, and more about the trail, the new XT M8100 is your best bet! Keep in mind that Shimano has designed this cassette to be compatible only with their Micro Spline freehub body standard and will not work with HG (Hyperglide) freehub bodies.