Quote:
Originally Posted by AndreasK
Tanks for a lot of good input! I'm focusing on rear for now. Front will follow. My car now has 245/40-18, and for aesthetic reasons I want more sidewall. To me the car drives great and it's low, perhaps to low! 17 is clearly the way to go to get a good selection of tires. 245-255/40-17 is the most common tire for 9" rims. But that's roughly the same sidewall, as I already have. Will there be a significant improvement in performance?
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245/40 x18 is ~25.7" tall,too much OD
the same wheel could probably use 245/35 @~24.7" but then the short side wall isn't your cup of tea.
So if changing wheels, in back use 8 to 9.5, wider is better for performance narrower for comfort
in 17 a sweet spot is 225/45 & 255/40, @25" OD, you'd want 8ET25 to 30 & 9ET12-15 or 9.5 ET19 wheels.`
for taller sidewalls go to 16 or 15, still using the above o/s, the lower the ET the more potential of issues at the lips and the more restrictions on chassis setup.