* Check the sticker on your driver's side doorjamb: This sticker will list the recommended tire size and inflation pressure for your specific truck. This is the most reliable source.
* Look at the sidewall of your current tires: The size is printed directly on the sidewall of the tire. This will tell you what's currently on your truck, but it may not be the original or recommended size.
* Consult your owner's manual: The owner's manual will also list the recommended tire sizes.
Without knowing your specific trim level and options, I cannot provide you with the correct tire size.
