Quote:
Originally Posted by RToyo86
235/40r17 = 24.4 (-0.8%)
215/45r17 = 24.6
245/40R17 = 24.7 (+0.4%)
225/45r17 = 25 (+1.6%)
235/40 is closer than a 225/45 in height.
I agree 235 isn't Ideal for an 7.5", it's at the max end of the spectrum.
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235/40-17 is too wide for a 7.5" wheel, minimum recommended width is 8", max is 9.5", measuring rim width is 8.5".
I just looked at eight of the most popular max and extreme performance tires in 215/45-17, and six of them were 24.7" in diameter, one was 24.6", and one outlier was 24.4" (Hankook RS4). Also OEM Primacy HP is 24.7" in 215/45-17, so stock diameter is 24.7".
225/45-17 is a very good fit on 17x7.5 and very close to stock diameter. 235/40-17 is not recommended on 17x7.5 and is as as much shorter than stock diameter as 225/45-17 is taller. Which is not enough to be concerned about anyway...