With its BEAM SPIDER construction, the new SHIMANO DEORE XT M8100 12-speed cassette shaves weight while increasing SHIMANO’s MTB gearing range another gear. Using SHIMANO’s new MICRO SPLINE freehub body and HYPERGLIDE+ tooth profile, the 10-45 cassette delivers advanced shifting performance.-Shift ramp designs provide fast and smooth shifts by HYPERGLIDE+ technology-Light and stiff construction reduces cassette inertia resulting in faster acceleration and increased chain security-Designed with a Shimano Micro Spline body that features smaller and more widely distributed splines to limit cog damage on freehub-The CS-M8100 cassette meets durability requirements for E-MTB applications