Shimano HG61 9-Speed Cassettes.12-36t 29"er-specific cassettes must be used with either M529 (6-bolt) or M629 (centerlock) hubs, which are designed and manufactured specifically to withstand the extra torque load exerted by the 36t low gearUse of the 12-36t cassettes with other hubs may result in hub-failure and may void warranty coverageItem SpecificationsIntended UseMountainCassette SpacingShimano/SRAM 9Cassette Body TypeShimano 9/10/SRAMCassette Cogs12,14,16,18,21,24,28,32,36Number of Speeds9Chain Compatibility9-SpeedRange12-36