* Check the sticker on your driver's side doorjamb: This sticker will list the recommended tire size for your specific vehicle.
* Check your owner's manual: It will also specify the recommended tire size.
* Look at the sidewall of your current tires: The size is printed directly on the tire sidewall. This will tell you what size is currently on your vehicle, but may not be the original or recommended size.
Without access to your specific vehicle's information, I cannot definitively tell you the tire size.
