Right.. so.. I've just googled that and it seems I'm wrong.Ok, gimme a quick explanation on the 650b, 700c size thingy.What’s the differences?
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A 650b wheel measures 584mm in diameter, and a 700c wheel measures 622mm in diameter.
I think I got confused with a fatter tyre fitted to a 650b wheel will have roughly the same rolling diameter as a skinner road tyre on a 700c wheel?
Sorry

