One of the most common freehub body sizes allowing for 6, 7, 8, 9 and 10speed cassettes to be installed onto them. 6 and 7speed cassettes will require a spacer behind the cassette to take up extra space. There are nine splines that encircle the freehub body, one of which is smaller than the rest. The small spline is positioned in a way that helps prevent cassette sprockets from being installed incorrectly.
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