Shimano XT M771 10-Speed Cassettes feature optimized tooth profiles for HG-X chain and Shadow rear derailleur.Item SpecificationsIntended UseMountainCassette SpacingShim/SRAM MTN 10Cassette Body TypeShimano 9/10/SRAMCassette Cogs11-36Number of Speeds10Chain CompatibilityDyna-SysRange11-36