Greatly dependant on tire and sidewall height as Trust86 stated. For example, a 245/40R17 Hankook RS4 is flat (no stretch, no bulge) on a 17x9 wheel, but a MPSS in the exact same dimensions has a very small stretch to it. 235/40 will look more or less the same as 225/45 in terms of stretch (there is some, still acceptable).
I would personnaly go between 235 and 245, but not higher than 255 and lower than 225. With 45 profile for 225 and 40 for everything else.
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