Shimano Ultegra 6700 Cassettes.Item SpecificationsIntended UseRoadCassette SpacingShimano RD 10,SRAM 10Cassette Body TypeShimano 9/10/SRAMCassette Cogs12,13,14,15,16,17,18,19,21,23Number of Speeds10Chain CompatibilityShimano 10,SRAM 10Range12-23