Well I like to keep my wheels and tire diameter as close to stock as possible. So the challenge is finding a rear tire that's wide enough (285 or 295) and a ratio that makes the wheel and tire diameter about 27.75 inches around. The best combo on a 19 inch wheel would be a 285/40/19 but the only tires in that size are well over $300 a tire. I don't autocross or do any hard core racing so I don't need to spend that much for a tire. The tires I have now are only 275/45/19's and they are a little too narrow for my taste. The perfect combo would be 285/35/20's. I can get the Goodyear Eagle F1 Supercar tires for less than $300 a tire and still get a good performing tire.