• 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.

    @svenhöek

    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?

  • Ah ok. I currently have Gatorskin 25mm tyres on a Miche XPress wheelset (which btw is holding up surprisingly well for my commuting purposes), and it's just about 26mm. The problem is, I can't find info about what the inner width of the XPress rims is, and I'm not quite curious enough to take a tyre off for that purpose... they look pretty 'standard' though.

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