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That seems to be about right for skinny road tyres, obviously not for 4" fat bike tyres.
Yeah of course, that makes sense. That's very useful to know though, thanks! Makes it easier to estimate which rim / tyre / fork combinations should actually work on my bike.
25c gp4000s count as 26mm or 27mm tires on a 15mm rim
So now you're confusing me again, why do they count as 26 or 27mm? Is that just what they come up as, or do you mean 'count as' for a specific reason?
SwissChap
svenhöek
That seems to be about right for skinny road tyres, obviously not for 4" fat bike tyres. I expect there's some sort of table in the ETRTO standard relating tyre sizes to rim sizes. There are also tolerances, so if it says "25C tyre must be nominal size on 15C rim", that means something like "between 24mm and 26mm"