Originally Posted by low_bmw
i have 225/45/17 in th efront and 245/40/17 in the rear on stock M3 rims. the profiles match perfect. if i go 215/45/17 in the front and 235/40/17 in the rear. would the profiles be the same, but a touch thinner and the width thinner? i know everyone wants to go wide, but i dont really like the bulky tire look. has anyone done it? just wanna know if the profiles will match from the front to back?
Here is a Tire Calculator by Miata.
Plug in your sizes. They key size to check is DIAMETER.
First, you want to stick as close as possible to the stock size of 24.7" - 25.0"
Second, you want your front and rear sizes to be as close as possible so that ASC/DSC is not thrown off.