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I remember reading the rule of thumb is 50-65% of internal width vs tyre width. So for a 22mm that would mean a 34c-44c. However, the Enve rim copies I am running are 21mm internal but designed specifically for a 25mm tyre (and with a 27mm external width).
Personally I wouldn't go below a 28, other than a tyre you know is going to balloon like the old gp4k
onyerbike
At what point is a rim too wide for a tyre? I'm running one wheelset on my gravel/winter road bike so I'm changing between 35mm tyres and skinnier road tyres. The rim is 22mm internal - am I pushing my luck using a 25mm tyre with this rim? I've used 28mm tyres on these rims but they size up closer to 31mm which is huge.