Technologies Explained: Micro Spline | SHIMANO

MICRO SPLINE has 23 spaced splines. With more splines, the interface with the cassette is stiffer and the engagement is quicker. This means that when you go from free-wheeling to pedalling, the pick-up feels immediate and there’s minimum loss of driving force within the drivetrain. The greater contact area also means that the freehub body can be forged out of lightweight aluminium - rather than titanium or steel - without the risk of deformation or gauging.

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