275/60/15

You don't need mini tubs but you will have to move springs in.

Couple things I had to do to make 275/60/15 fit on my car. I ended up trimming the under side of the fender lip on my car about a 1/4" to eliminate rubbing in corners. I also had to use a 3/16" spacer on one wheel. That's how tight it is. I also run them on 7" wheels. I think the 8" wheel might make the tire section wider and rub but I have never tried them.