Originally Posted by radiognome
What would be a recommended set up for a stock 2008 e93 for Auto-X? I was thinking about getting 18'' wheels with square 265/35 or 275/35, but very confused with all the spacers, rubbing, and offsets questions because people always discuss e90/e92 and I'm not sure how e93 body and weight difference would work. Also not sure if the square set up is ideal for Auto-X. Bunch of questions =)
As dcstep mentioned, the 18x10" ET25 squared setup with 275/35/18's is a very ideal autocross setup.
That will be a direct fitment with no rubbing on your convertible M3. The square setup can be rotated, which is ideal for an autocross setup. The corners are very sharp and you'll be putting a lot of wear on the outer edge of your front tires if you don't have camber plates and a lot of negative camber dialed in. Rotating your setup front to back will save you a lot of money.