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[uhaulball]

Originally Posted by leftcoastman

I fit 255-40-17 on 8.5 inch rims, in front, no problem. I know people have run the stock rear 255's up front and there is no rubbing, diameter or width-related. If you look at the diameter of the 255-35-18 and compare to a typical 245-40-18, it's very similar.

We're talking within 1/2 inch, which means 1/4 inch on each side. From running 255-40-17 up front, I can tell you that diameter was not an issue. Of course, it all depends on offsets, etc.

You can read about my setup here:

http://www.e90post.com/forums/showthread.php?t=95066

actually a 255/35/18 has a diameter of 25" and the 245/40/18 has a diameter of 25.7" - according to the specs of the OEM Potenzas.
http://www.tirerack.com/tires/Spec.j...3D535YR8RE050A

and 7/10 of an inch is a lot, not a little. it will cause errors in the DSC system if u dont run it on all 4 corners.

[Ph0zenstone]

care to elaborate on why it would throw error codes? i though the ultimate question here is physically would it rub or not, i didnt think it would throw any codes. i still havent tried it cuz im still waiting for the wheels to come in, but it seems like no one has even tried 245/40/18's all around ever on the E92 or E90.