SRAM XG-1270 12 Speed Cassette E1The SRAM Force AXS XG 1270 D1 Cassette is optimized for electronic shifting. It features X Range gearing technology and a 10 tooth small cog to progress fluidly and efficiently. The XG 1270 D1 cassette is designed to operate with XDR driver bodies. Features at least five one tooth jumps for a smoother gear progression Mini cluster construction reduces weight and increases durability 10 tooth start helps provide a wider gearing range Designed to work