The Shimano XTR M9100 12 Speed Cassette provides the smoothest, fastest and most reliable shifting performance imaginable. Featuring the new Hyperglide+ technology, which delivers the highest level of superior shifting, power-transfer and shifting stability. This cassette design is stiffer, lighter and more durable than anything that has come before it, combining titanium, aluminium and steel where it is best suited, this cassette is optimised for the toughest and most demanding rigours of mountain biking Superb Shifting Smoothness Anywhere on the Mountain. Designed with two intentions, the 10-45T cluster, featuring the Rhythm Step spec for exceptional Cross Country shifting smoothness. This wide range can tackle any scenario and provide superb, smooth and consistent performance throughout the range of the cassette.