SRAM Force XG-1270 Cassette - 12-Speed 10-30t Silver For XDR Driver Body E1SRAM Force XG 1270 Cassette 12 Speed 10 30t Silver For XDR Driver Body E1. The 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