The Sram 11-Speed X-Dome cassette makes Sram's new XX1 drivetrain possible. It starts with Sram's X-Dome technology which allows the bulk of the cassette to be machined from a single piece of aluminum, making the cassette light enough to be a reality. Secondly, Sram redesigned the freehub body connection to increase the stiffness and solidity of the cassette to hub interface. Sram calls it the XD Driver body. It also allows the use of a 10 tooth cog, increasing the top end of the XX1 drivetrain as well as the bottom end over a 10 speed system.
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