I have the 18" factory option turbo twist rims on my S. I just ordered a new set of Bridgestone 960AS Pole Positions from TireRack in the following sizes:
F: 225/40-18
R: 265/35-18
As you can see the sidewall height number drops down when using a wider tire. But if you do the math, the sidewalls are less than 3mm variance since that number is actually a ratio.
Hope that helps!
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