After reading through this thread more than a few times, taking many notes and sending a PM I decided on 265/40-18 on all fours and 18x9, 5.25 back space, 7mm offset on all fours. I had 16x7.5 and 255/50-16 on all fours before. I think 72bluNblu is right on the money suggesting 5.25 back space on a 9" rim. Thanks 72bluNblu. I have an inch clearance on front and back of each tire. My car is completely stock as far as suspension clearances. The new rims are U.S. Mag.