Shimano XTR CS-M9101 12 Speed Cassette Hyperglide+ 10-45tThe Shimano XTR CS-M9101 12 Speed Cassette features better chain retention and ground clearance. This cassette is built with a strategic application of aluminum, titanium, and steel materials for an optimal blend of weight savings, rigidity, and durability. The CS-M9100 cassette meets durability requirements for E-MTB applications. Hyperglide+ technology offers better chain engagement, stronger retention, and smoother pedaling for greater power and confidence over rapidly changing terrain. Micro Spline technology delivers lightweight aluminum freehub body to reduce weight and utilize a 10 tooth top gear. This is the 10-45t version.192790893334