Shimano CS-M9101-12 speed Cassette Black/Gray, Micro Spline Size:10-45t or the included controller

or the included controller

000 Weight lb 305 Package Size in 45*23*37

Chrome shanks

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Shimano CS-M9101-12 speed Cassette Black/Gray, Micro Spline Size:10-45t or the included controllerShimano XTR CS M9100 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. Compatible with Shimano Hyperglide+ chains Hyperglide+ technology offers better chain engagement, stronger retention, and smoother pedaling for greater power and confidence over rapidly changing terrain Micro