Keep the correct size on there. You will appreciate the extra sidewall strength. You can get Toyo Proxy TR-1 in the correct size. They are great in the rain and AMAZING in the dry! Not much good in the snow but they will keep you on the road. That is all I run on my stock wheels. They are a little off balance when they are cold because of the soft compound, but that all goes away as soon as the tires get some temperature in them. I get mine from Kauffman tire. They should have your correct size.