Tire PSI

azdryheat wrote:
My Chevy dually also recommends 65 PSI in the rear tires. I had everything weighed and my trailer puts 3500# in the bed. Dividing the total rear-end weight by four and then looking that number up on the Bridgestone chart shows the 65 PSI on the door is exactly what Bridgestone calls for, not 80 PSI. At 80 PSI you run the risk of wearing out the center portion of your rear tires. I ran my rear tires at 65 PSI for 50,000 miles and the tires wore great.

Correct, I did that years ago, wore centers because of over inflation.
Thanks

My Chevy dually also recommends 65 PSI in the rear tires. I had everything weighed and my trailer puts 3500# in the bed. Dividing the total rear-end weight by four and then looking that number up on the Bridgestone chart shows the 65 PSI on the door is exactly what Bridgestone calls for, not 80 PSI. At 80 PSI you run the risk of wearing out the center portion of your rear tires. I ran my rear tires at 65 PSI for 50,000 miles and the tires wore great.

lbrjet wrote:
Your rears are rated at 2535 per tire in a dual application at 65 psi. Your fronts are rated for 3020 per tire at 75 psi. Both psi's exceed your axle ratings. Ford's recommended tire pressures always assume a maximum load.

Best answer so far. Having a drw with 80 psi in the rears will create a needlessly rough ride. Go with what is on the door.

Your rears are rated at 2535 per tire in a dual application at 65 psi. Your fronts are rated for 3020 per tire at 75 psi. Both psi's exceed your axle ratings. Ford's recommended tire pressures always assume a maximum load.

Do you remember, back in the late 90's when the Ford Explorer was involved in many crashes because Ford recommended a lower tire pressure than Firestone recommended, just to get a better ride?

I'd go with what is on the tire and live with the ride.

GordonThree wrote:
I'm no expert, but my studying of this has lead me to this belief:

The tire marking is the maximum design cold pressure as determined by the tire manufacturer.

The door jamb sticker is the vehicle manufacturer recommended pressure to achieve balance with the rated load capacity, ride comfort and government fuel economy mandates.

If you look up the load charts for your tires, you'll see the Ford pressure rating matches up with the axle rating.

My grocery getter 1500 has Goodyear E tires (10 ply), but only needs 42 psi to achieve the axle weight rating on the tires. The tires are also marked 80 psi max cold. I run my rears at 60 psi when towing, just to firm things up a little.

You hit the nail on the head,I believe the difference is in the tire and axle differences, as is load carry capacity.

Thanks

I'm no expert, but my studying of this has lead me to this belief:

The tire marking is the maximum design cold pressure as determined by the tire manufacturer.

The door jamb sticker is the vehicle manufacturer recommended pressure to achieve balance with the rated load capacity, ride comfort and government fuel economy mandates.

If you look up the load charts for your tires, you'll see the Ford pressure rating matches up with the axle rating.

My grocery getter 1500 has Goodyear E tires (10 ply), but only needs 42 psi to achieve the axle weight rating on the tires. The tires are also marked 80 psi max cold. I run my rears at 60 psi when towing, just to firm things up a little.

2oldman wrote:
80

Finally, a firm answer, but what I am curious about is why the numbers on the door are different. I was going with the 80 anyway.

Your tires should be inflated to carry the load that is on the tires. You can get the inflation chart by weight off Goodyears tire charts.

80