Originally Posted by Lemans_Blue_M
Ahh, now that makes sense.
This explains why he was rubbing on the liners...
/18 PS2 tire has an OD of 25.3"
, and a 265/40
/18 has an OD of 26.3"
which is a huge difference in tire fitment terms. His 265/40/18 tire was simply too big fit inside the front wheel well. It wouldn't have mattered if they were PS2's or not, that tire size has no chance of working.
A 265/40/18 tire would eventually rub a hole in the wheel liner. The clearances are so tight, that you are limited to 26.0" OD max. (and even that may rub under full steering lock)
The BMW engineers were just stingy with the real estate in the front wheel well.
Now the 265/35
/18 mounted to the 18x9.5 +25 offset wheel, will have a lot more clearance to work with...since the OD of the tire is actually 1" smaller.
If the diameter difference between 35 and 40 aspect ratio tires is 1", he should be fine based on what a saw on Joe's car--the rubbing wasn't terrible.