17's up front and 18's out back???

[rodney]

Do you think an alero would look ok with 17" wheels in the front and 18" in the back? my car is lowered and im getting a razzi kit soon. with the 17s i have now, i think going to 18s in the rear would look nice, but what tire size would i get? i have 225/45/17, should i try to keep the same amount of sidewall as the fronts or just go to 225/40/18 in the back?

thanks