If you’ve ever read about SRAM’s 1x11 groupset options (including the new Force and Rival road setups), you’ll likely have seen reference to an ‘XD Driver’. Simply put, this alternative freehub design came about from SRAM wanting a cassette cog smaller than an 11T – the smallest that common Shimano-type rear wheel freehubs can fit.
With this, the SRAM XD driver allows the fitment of a smaller (higher) 10T cassette cog and therefore gives greater range – and so validity – to 1x11 setups.
As an open patent, XD was created by SRAM with the introduction of SRAM XX1 in order to offer space for a 10T cassette cog and a claimed improved interface with the cassette. Since the release, we're now seeing brands such as e*thirteen and Leonardi Factory offer 9T-equipped cassettes.
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XD was designed to work with existing hub axle designs, ratchet mechanisms and bearing placements and so many wheel brands have since created XD freehub bodies to retrofit to existing rear wheel and hub models.
Shimano does not offer XD-compatabile drivers. Pictured is a regular Shimano-type splined freehub body
You can read more at BikeRadar.com
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