Originally Posted by DDMotorsports

You can do up to 11.5" in the rears and probably even a 10" up front. I have personally put a 9.5" front on my car already but haven't seen anyone go with a 10" front yet. On the rear, in 19" there is a suspension arm that gets in the way at 11.5" wide, but if you go with 20s you can fit a 12" as the bigger diameter offers more clearance on that suspension arm.