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gbj_tester in reply to @legomartian

Is there any reason I can't use a road/mtb rear disc hub to use a bolt on fixed cog, and then in future use the other side to fit gears?

Chainline for a bolt-on sprocket on a 135mm OLN rear hub comes out at 54mm.That's too far out to work nicely with a road chainset, which will typically have the outer ring at about 47mm. The middle ring of an MTB triple is typically at about 51-52mm, which is close enough.

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legomartian in reply to @gbj_tester

Thanks guys, this is pretty interesting. Especially as One-one have a SS MTB crankset on ridiculous offer. Am I right in thinking a SS MTB crankset would run about the middle ring of a triple?
Here's the link for anyone interested; http://www.on-one.co.uk/i/q/CSOOTC/on-one-external-bearing-track-crankset

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gbj_tester in reply to @legomartian

Am I right in thinking a SS MTB crankset would run about the middle ring of a triple?

Not necessarily, e.g. SRAM general purpose 1×10/11 MTB cranks have a 49mm chainline. The product you linked to is a track crank, chainline will be about 42mm

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