Xx1 xg 1199 cassette 11 speed ranging from 10 to 42 tooth the 11 speed x dome delivers an incredibly wide gear range while maintaining even optimized steps the single unit cassette combines with the xd driver body for a superior connection to the wheel this xg 1199 x dome cassette is an integral part of the sram 1x drivetrain system no compromises 11 speeds 10 12 14 16 18 21 24 28 32 36 42 xd driver body attachment to hub bearing design and ratchet mechanism steadied by xd driver body