Shimano XTR 10 Speed Mountain Bike Cassette. It's tough trying to be the best all the time, but Shimano's been at it for years, and this year is no different. Introducing the new XTR. This Shimano cassette is 10 speed, and it features Dyna Sys technology to give you smooth, reliable shifting, no matter what. The new 10 speed cassette has an alloy carrier and 5 titanium cogs to shave grams. The refined tooth profile optimizes shifting, and is perfect for use with HG X chains and Shadow rear derailleurs.