The Shimano CS-M8100 is the suitable cassette for new XT 12-speed group. HYPERGLIDE+ drivetrains redesigned cassette and chain promotes the next generation of MTB riding by enhancing speed, shifting efficiency and smoothness over any terrain. Hyperglide+ quicker shifting Material Aluminium & steel BEAM SPIDER construction Increased acceleration MICRO SPLINE 10T lowest sprocket realized by new FREEHUB body construction Compatibility 1x or 2x chainring systems MICRO SPLINE Delivers lightweight aluminum FREEHUB body to reduce weight and 10 teeth top gear. Use a combination with MICRO SPLINE cassette sprocket and FREEHUB. Benefits & Features Lightweight aluminum MICRO SPLINE FREEHUB seamlessly integrates with small 10-toot