SRAM Rival AXS XG-1250 Cassette - 12-Speed 10-36t Silver For XDR Driver Body D1SRAM Rival AXS XG 1250 Cassette 12 Speed 10 36t Silver For XDR Driver Body D1. The SRAM Rival XG 1250 Cassette offers smooth precise shifting in ranges that cover road gravel and everything in between. SRAM brings their premier 12 speed drivetrain features such as a wide range X Range gearing technology and a 10 tooth start to the Rival component group. X Range gearing gives you more range and a smoother gear progression so youre always in the right