Usually the recommended tire width is, 1" bigger or smaller from the rim width. Personally, unless you go with something super insane, you really shouldn't have a problem. And I have seen some pretty good stretch on wheels in my time, and they run just fine.
It is actually even recommended to not run an oversized tire on a rim/wheel. If you talk to the right people, they will even tell you that you should have a *slight* stretch in the tire sidewall, for the best performance.
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