Quote:
Originally Posted by sor
It looks like your M235i probably had 225/40R18. That has a sidewall height (road to rim) of about 3.5 inches.
You could do the Michelin Pilot Super Sport 255/45ZR19 on the OEM X3 19" wheels. It would have a side wall of 4.5 inches, making them slightly more compliant than your M235i. Obviously the vehicle dynamics are different.
The 21" wheels could do 255/35ZR21 Super Sport on the front and 285/35ZR21 in the rear. Those would get you back to a 3.5" sidewall height comparable to the M235i with 18".
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Thanks for the suggestions! I would love to somehow get PSSs--best tires I've ever experienced--on the X3. The BMW configurator says the stock 19" wheels are 7.5" wide, and it seems as if that will not accommodate 255 wide tires:
http://www.1010tires.com/Tools/Tire-...ismetric=False
I could buy new wheels but prefer the OEM look. Also a little worried that 21" will get more harsh than the m235i, even if it's the same sidewall height, because of the difference between the vehicles (i.e., weight/suspension tuning).