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Howdy fellas,
I’ve had my new truck for about two months. Took it to the dealer for my ‘free’ oil change. The dealer set my tire pressure to 40lbs. My door sticker says 35lbs.
At at this point I have no idea what the tire pressure should be.
I actually have mine set at 36.
Keeps the tire pressure up a little better on very cold mornings.
40 is to high IMHO. When the tires warm up as your driving they are going to be even higher.
What was the outside temperature when they were set?
Checkk them next time you get a chance before you drive it. If it’s cold out, they will probably be closer to 35 than 40 psi. You tires where warm when you drove into the shop and the outside air is probably colder than the air in the shop.
Gentlemen,
The outside temp yesterday was below freezing all day. I’ll check the pressure tomorrow morning while in the garage before i drive it.
since the truck is new, I’d hope the door sticker / tires are correct!
I would check it while outside, while tires are cold since this is a more accurate representation of what the truck will see. When I fill in my garage in winter, I overfill about 2-3psi, since they drop 1psi for every 10ºF. I can actually watch the pressure drop from the screen on the way out of my garage on particularly cold days. Garage is attached but non-heated.
Anywhere between the door sticker and max tire pressure shown on the tire should be fine when checking cold tires.
Higher pressures will ride a bit rougher.
The max tire pressure molded into the tire allows for increased pressure (above the max pressure) caused by thermal expansion.
The shop is actually pretty smart to add extra pressure if it is warmer inside the shop than it is outside. They know the cold pressure will be lower than whatever pressure they inflated your tires to.
I always use the psi ratings that are on the tire itself because the door sticker has no idea what tires you have on
That's right, the E rated we have on the old truck say 80 psi, We run 70 psi front and 60 psi rear, if I'm going to haul a load I'll air the rears to 80 psi
Originally Posted by Jonesy0027
Gentlemen,
since the truck is new, I’d hope the door sticker / tires are correct!
Let us not forget the big blow big between Ford and Firestone over tire failures on the Bronco II.
Due to complaints about rough ride Ford put a tire sticker on the truck calling for 24 psi, tire sidewall called for 35 or 40 psi, don't remember exact number now, Ford dumped it all in Firestones lap.
I picked up a few sets of new Firestone takeoffs for free and ran them on my 90 Ranger, wore them all out without a single failure.
The ones I seen that failed were worn out on the edges with the steel belts showing due to under inflation.
I wouldn't run them any lower than the door sticker, if you haul much I'd air them up closer to what's on the sidewall of the tire.
The tires on my F-450 call for 125 psi, that's where I run them, never looked to see if there's tire chart on the door.
"Let us not forget the big blow big between Ford and Firestone over tire failures on the Bronco II."
Explorer, not BII. Firestone had a bad bunch of tires in the mix, which added to the underinflation problems.
Driver error contributed greatly to the accidents.
That said, you can run low or high pressures, as long as there is enough air to support the load, and not so much as to limit the contact patch and limit traction.
Door sticker numbers are usually a good place to start. Number on the sidewall is simply where to stop.
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