235's fit fine on stock 15x7s

Out back, 15x9 by itself is probably ok, but it really depends on the tire. Should you go with a 275 you are going to have problems as well, remediable probably by removing (or flipping) the quad shock, and a little fender massaging again.

If you're just after the 'look' run 235's up front, and maybe 255's out back. Otherwise, going around corners your suspension/tires are going to rub on you and it might not be worth it to ya.

I dunno, just my opinion.