The problem is sticking with a 15" wheel is that radials dont really get much wider. Plus, the 31x10.5 is 30.5" tall and will fill up the rear wheel well really good seeing that is 32" wide. And i dont want to go to wide--i dont want them sticking out, because it will be lowered to the point the the top of the tire will just be covered by the fenders. These were my reasons for the tires picked and the wheel sizes i picked. I want to stay with 15's as the prices are really good to do the entire package of wheels and tires (under $1000)