Originally Posted by wrxsomeday
You probably won't feel a noticeable difference between between 245's and 255's (given the same suspension setup), and maybe not even between a 245 and 265.
However, autox is a game of tenths of seconds, so we generally try for all we can get
Yazel - I'm running 265 Federal RSR's on my 18x8.5's and they seem to fit fine. Star specs do run wide tho...
I went from a 255/40 Star Spec to a 245/40, leaving all else he same, and was pleasantly surprised at how noticeably better turn-in felt and general overall responsiveness. This was on a 17x9 wheel, too. I can't say downsizing made me faster or slower, but I definitely liked the improved feel.