The Shimano XT CS-M771 10 Speed Cassette is built to help riders achieve their maximum efficiency. Equipped with Shimano's Dyna-Sys, the XT CS-M771 has closer ratios which leads to smoother shifts and makes you more stable while pedaling. The Shimano XT CS-M771 10 Speed Cassette is compatible with all Shimano 10 speed drive trains. The sprocket sizes are 11-13-15-17-19-21-23-26-30-34. This cassette features an 11-34 ratio.