Hi - I just purchased a 2004 z4 with 17x8 OEM Wheels. While I would love to go out and purchase a new tire and wheel package I do not have the funds to invest. That said the car still has the OEM Run Flats that I must get off the car so I am going to cough up the cash for some new rubber. I am just going to use the car as a daily driver but I do like to push it on some back roads. Would you go with a square setup of 225 / 45 (stock) or try and get a little more rubber on the back and use 235 / 45. It looks like that would provide roughly a half inch more contact in the rear. Interested in your opinions.