I have a 2wd 97 f150. I dont really plan on lifting or leveling it as of now but i want to put some new 18" rims on it. whats a good tire size that i can fit thats bigger than stock size and that i can buy in an at or mt tire?

 

At a 31x10.50 should fit okay, mt you could probably go with that size but you may have some rubbing because of the more aggressive tread but it all depends on wheel width and wheel offset/backspacing.

 

should be a few threads floating around on this, but I ran 265x75r16 on my 97 2wd w/o any rubbing or fitment issues. I would imagine it would be the same for an 18" rim. They were BFG A/T's