2022 Timberline Tire Pressures

It's indisputable that LT tires can support more weight than the P-metrics. I'll probably put Bridgestone Dueler AT Revo 3 tires on this like I did with my former Expedition. In my 18" wheel size specs:

LT275/65R18: 3,415 (each) x 4 = 13,660 -- at 80psi.
P275/65R18: 2,601 (each) x 4 = 10,404 -- at 44psi.
GVWR (still): 7,500

Truck tires ride like a truck all the time.

-- Chuck

I agree and disagree with most of the above. On the tire is a max air pressure number. Which is the level to be used when the truck is loaded to it's total gross weight. I don't pay much attention to the door sticker.

I am not a tire, oil, nor fuel expert--but TTBOMK:
1) The tire's maximum listed pressure is for max loading of the tire, not the truck.
2) The sticker is the proper tire pressure to support the maximum weight of the truck for that combination.

Changing tires of different sizes, weights, loads, etc. changes nearly all of the factory PSI formulas. There is some hard math behind it and other forums go into it in great detail.

As a general rule to be applied at your own risk, adding a few PSI above stock recommendation may offer better handling, especially where heavier tongue weights are concerned due to tire "squish".
Also, if you ran at full max load nearly all of the time (such as an overlander and we are talking 1500-1700 pounds of gear an passengers), you could see a benefit in LT (heavier load/duty) tires at the cost of some ride if emptied.
**This can be especially true if you are loaded heavy and air-down when off-roading.
**Airing down for off-roading is still bad for tire life overall, and heat buildup on road with too low pressure is terrible for tire carcass life (regardless of tread life). That is why the moment you get back on the road you really need to air up ASAP.
**Remember too, tires have a 'shelf life' due to exposure in years regardless of miles left on the tread, and this comes into play too.

3rd Expyowner123 said:

I believe the 50psi is intentional from the factory, to prevent flat spots forming while having the vehicle stationary during shipping. As per LazSlate’s comments, tire pressure should be part of dealer’s pre-delivery review process.

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this.

they don’t know how long it will take to get out of storage and transport

mine were over. Dealers can get lazy with TPM System. It won’t alarm high pressure

P or XL rated tires on an offroad type vehicle is laughable. LT rated tires in 10 ply have stronger sidewalls which I find to stiffen up the IRS sway. When towing I air mine up to 65 psi cold and it really helps with our 7500 lb camper in addition to a WDH . Lots of flats around here from people rebuilding after Hurricane Ida last year. Traction doing light offroading is so much better than the stock Michelin Primacy tires. Better looks than the stocker's too!!

I agree and disagree with most of the above. On the tire is a max air pressure number. Which is the level to be used when the truck is loaded to it's total gross weight. I don't pay much attention to the door sticker.

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Wrong, of course! Pressure on the door sticker is the level to be used when the truck is loaded to it's total gross weight. Yep that sticker is there for a reason.

-- Chuck

chuck s said:

Wrong, of course! Pressure on the door sticker is the level to be used when the truck is loaded to it's total gross weight. Yep that sticker is there for a reason.

-- Chuck

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Please explain what the max air pressure on the sidewall on the tire is for. Also when does it come into play.

Maximum cold tire pressure is just what it says. Don't inflate (cold) to a higher pressure. Inflated to that pressure the tire will support the weight also listed on the side wall. In Post #11 I note two examples:

LT275/65R18: 3,415 (each) x 4 = 13,660 -- at 80psi.
P275/65R18: 2,601 (each) x 4 = 10,404 -- at 44psi.
GVWR (still) : 7,500

Maximum cold tire pressure never comes into play and can be ignored since at "sticker" pressure -- well below maximum cold tire pressure -- the tires will support the maximum allowable weight of the Expedition.

My OEM tire data and "sticker." Yours are very similar.

Bottom line: You can inflate up to and including the cold tire pressure but any pressure over the sticker pressure will not add additional carrying capacity although it may improve towing or other factors.

-- Chuck

"Please explain what the max air pressure on the sidewall on the tire is for. Also when does it come into play."

Fastcar, I answered that, but maybe not completely.

The tire sidewall max PSI is to achieve max loading of the tire (x4 tires) and combined is always greater than max vehicle gross weight. At least it had better be...

**Below are rounded up even estimates to keep it simple:

Example--the factory plate & tires at 35 PSI says Tire X can support the Expy fully loaded Ford declared weight of 7,600 lbs (5600 lb truck + 2,000 pounds of people and gear).

Completely seperately--the tire company declares a max cold pressure of 50 PSI. That tire is rated by their company to carry 2500lbs at max air (50 PSIi), of course x4.
Max load for all 4 tires at 50 PSI is 10,000 pounds--far exceeding max load for that Expy as declared by Ford.

Some folks prefer higher load ratings and/or higher PSI for increased safety based upon added weight, towing, airing down for 4wheeling when loaded, rock slash reistrance, etc.

All of this info is on the tires sidewall (even breaks down if used in a dually configuration) and manufactures plate--just needs to sussed through.

YMMV.

Pawpaw said:

P or XL rated tires on an offroad type vehicle is laughable. LT rated tires in 10 ply have stronger sidewalls which I find to stiffen up the IRS sway. When towing I air mine up to 65 psi cold and it really helps with our 7500 lb camper in addition to a WDH . Lots of flats around here from people rebuilding after Hurricane Ida last year. Traction doing light offroading is so much better than the stock Michelin Primacy tires. Better looks than the stocker's too!!

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This is precisely what I am trying to accomplish. Not increase tow ability. Just add to the trucks stability while within the proper load and tow ranges. Increased off road performance would be nice also. I will accept a change in ride comfort.