thanx guys. i know the xfire has tons more room in the rear due to not having a roof that folds into the trunk. i would love to run a 275 in the rear with the factory 225/40 up front in 18's . just trying to get ideas as to were the limits are. im thinking a 8" wide in the front with the 35 offset and a 9.5 wide in the rear with a 40 offset should fit the bill without rubbing