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@Northern_Graeme
I really want one of these sooo much but can't really justify it. Would buy it with the duomatic (saw the original on a classic bike last year and thought it was an amazing concept) and get another wheel built up with fixed.
That sort of explains it - a smaller wheel could be rotating twice as fast as a 700c, but it'd have much less mass (and that mass wouldn't be as far from the axle). Wouldn't the two just cancel each other out...?