tire size? up or down

remember, that is the "nominal" size... different manufacturers' tires may vary a bit. One thing you can do is go to Les Schwab or some other tire store and let them look at it and they will tell you what size tires you would need to replace what you have. They would probably also roll some out to your car and give you an idea of the different options. I don't have a problem doing that as long as you tell them you are just shopping and trying to figure out how much it will cost. They will print off a price for you with a coupe different options.