after doing the search, i found this topic...so I figured this is the best place to post my question. As per above posts and many others on similar topics, people seem confident that for stock front wheels on an 08 Touring (which has 18x8 fronts and 18x8.5 rears) a 245 front tire is a good set up, thus, my question is: I looked at the clearance room with the current tire, which is stock, and saw that there isn't that much head room left over between the tire wall and the wheelwell and I'm curious if the 245/45/18's (which are the rear set) rub, being a bit taller???? (this is assuming that 245/40/18 is a safe set up to prevent rubbing)

Thanks for the input guys.