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Old 04-07-2019, 05:06 PM   #1
swj
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max air pressure

Ford F150 SCrew, max tow pkg, 20 " tires. Towing 7000 lbs trailer.
Truck has Michelin 275/55/R20 LT, tire has max PSI 44 on sidewall.
Run 35 PSI as daily driver and inflate to 44 PSI when towing?
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Old 04-07-2019, 05:31 PM   #2
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Thats what most folks do. At least the back tires at max cold psi. Front can run a little less.
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Old 04-08-2019, 10:07 AM   #3
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max psi

Michelin says 35 psi as printed on door jam, ford dealer says 35psi for all four tires, 35psi is based on fully loaded truck with payload of 1732.
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Old 04-08-2019, 10:15 AM   #4
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Michelin says 35 psi as printed on door jam, ford dealer says 35psi for all four tires, 35psi is based on fully loaded truck with payload of 1732.
Correct. Nothing wrong with going to 44 if you find it helps a little.
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Old 04-08-2019, 11:08 AM   #5
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The tire's max load rating is achieved at the PSI listed on the door tag. Adding more air will not help carry more weight, but it may help eliminated some of the "wobbly" feeling reported when trailer is at full weight. Perfectly safe to put more in and see if you like it better.
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Old 04-08-2019, 11:11 AM   #6
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I don't give the door sticker for tire pressure much credence. They are usually either good for non-towing, towing, or neither.

Good example is my current truck. Max cold psi is 80 on the tire. Door sticker says 55psi front, 80psi back. At 55psi the fronts look flat (heavy diesel), handling and steering is just bad. 80psi for rear is great for towing, terrible for ride when not towing. This door sticker makes no sense to me.

So when not towing I run 65psi front, 60-65 rear. When towing I run 70 front, 80 rear.

You will get lots of opinions on what is correct. I'm just telling you what I do. Pick a psi that works for you and your situation (loaded, unloaded). Somewhere between door sticker and tire max cold psi is a good starting place.
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Old 04-08-2019, 11:14 AM   #7
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Originally Posted by NMWildcat View Post
I don't give the door sticker for tire pressure much credence. They are usually either good for non-towing, towing, or neither.

Good example is my current truck. Max cold psi is 80 on the tire. Door sticker says 55psi front, 80psi back. At 55psi the fronts look flat (heavy diesel), handling and steering is just bad. 80psi for rear is great for towing, terrible for ride when not towing. This door sticker makes no sense to me.

So when not towing I run 65psi front, 60-65 rear. When towing I run 70 front, 80 rear.

You will get lots of opinions on what is correct. I'm just telling you what I do. Pick a psi that works for you and your situation (loaded, unloaded). Somewhere between door sticker and tire max cold psi is a good starting place.
^^This^^ is my mode of operation as well.
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Old 04-08-2019, 11:18 AM   #8
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Just a FYI. My first sentence was a fact. Everything after that was an opinion.
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Old 04-08-2019, 12:22 PM   #9
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Originally Posted by alb2tpa View Post
The tire's max load rating is achieved at the PSI listed on the door tag. Adding more air will not help carry more weight, but it may help eliminated some of the "wobbly" feeling reported when trailer is at full weight. Perfectly safe to put more in and see if you like it better.
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Just a FYI. My first sentence was a fact. Everything after that was an opinion.
Sorry, you're incorrect or misstated what you were trying to say.

The TRUCK'S max load rating can be achieved at the PSI listed on the door/pillar tag, meaning the factory tires can carry the truck's GVWR/GAWR at the PSI listed on the truck's tag. The TIRE'S max load rating is achieved at the PSI listed on the tire.

The TRUCK tag PSI has nothing to do with the TIRE'S MAX load rating. The tires absolutely can carry more weight if more pressure is added above the truck's tag PSI (provided the tag PSI is not the same as the tire's max load PSI) but that does not increase the TRUCK'S load capacity.
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Old 04-08-2019, 12:40 PM   #10
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Very similar to what I did with 1500 Silverado and old Jayco. Close to the same weight..
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