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A bigger wheel doesn't necessarily mean a taller tire.
Typical 911/964/993/rear fitments might be
8x16 225/50 @25.1x9.2" 835rpm
9x17 255/40 @25.2x10.7" 831rpm
10x18 265/35 @25.2x11.1" 831rpm
As you can see they all have about the same height(revs per mile is a more accurate measure)
What you get w/ the bigger rim is a wider tire w/ a shorter sidewall that runs at smaller slip angles and runs coooler longer.
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