Reddog1 wrote:
I also see it states "with" tire size given and psi. If you have the original tires, would you look and see the load capacity on the sidewall is?
What am I missing?
In reference to the inflation number for the tires on the sticker.
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What Ford is saying is at the inflation numbers on the sticker the tires are capable of supporting the maximum GVWR of the truck ( loaded up to 6230 pounds) with what ever safety margin Ford deems acceptable as well as providing a balance between ride, handling, and fuel economy that they deem appropriate.
Adding up the tire rating on my truck is pretty meaningless. For example, the rears are derated to 2910 (because of the DRW configuration). Four of them gives 11,640 pounds. Add the fronts at 3195 each and you get a total of more than 18,000 pounds capacity. Clearly other components are limiting the GVWR of the truck. If you inflate the tires to the maximum 80 psi that is on the sidewall you are inflating beyond the needed carrying capacity of the truck. The 65 psi Ford recommends for the rear tires supplies the necessary carrying capacity for the trucks GVWR but balances out the other considerations.