Originally Posted by
flyromeo3
ummm....not exact. the overall diameter will be less.
Since he is going wider the profile needs to compensate for the extra width which is why you go one size lower.
If you retained the same profile with wider tire the diameter will still be the same.
225 - width 40- profile 17 - size
So you're saying that the overall diameter of a 245/40/17 is going to be smaller than a 215/45/17 tire?