Depends what you are doing with the truck, and what load range the tires are, vs how you want the ride to feel. Load range E (stiff heavy tires) will ride just fine typically at 35-40 PSI if you are running around unloaded or lightly loaded. I usually have around 35-30 PSI in mine (35 front/back, maybe 30 in back) for the best ride on my terrible roads and stiff 3/4 ton suspension.

 

I run my toyo open country at2 load range E at 41psi front and rear. They ride fine and more importantly wear flat.

 

40-45 always. No matter the load. They don't like lower pressures.

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I run 45psi in mine. 285/70/17 E

 

My Lt tires call for 80 psi, TPMS is set for 80,, I run with out a load or towing at 45 front and 40 back,,, warning light stays on all time!!

 

You probably have a 2500 I'd assume?

 

Load inflation table.

Tire makers often have on their website, but it's all industry standard so brand doesn't really matter.

https://www.toyotires.com/media/2125/ap ... 170203.pdf

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I run my toyo open country at2 load range E at 41psi front and rear. They ride fine and more importantly wear flat.

That's what I run my 285/65/18 Toyo OC ATII E tires at.

 

That linked article didn't say anything about this though:

Do you run the same cold psi; say 35PSI, at 0*F and at 90*F????

 

That linked article didn't say anything about this though:

Do you run the same cold psi; say 35PSI, at 0*F and at 90*F????

You always run the same psi no matter the temperature. Check your tires when they are cold. Remember it is getting cooler outside now and a good rule of thumb is that air pressure in a tire typically goes down 1-2 pounds for every 10 degrees of temperature change. When the temperature goes up so does the air pressure in your tires.

 

I've run my BFG KO2s at anywhere between 40 and 45 PSI cold. Typically summer it is closer to 45, and winter is more like 41. Why? Because temperature changes and I don't get the air compressor out :lol:

They've worn evenly and also within the range that has been recommended, so I don't bother screwing with it too much.

 

I adjust the pressure twice a year. Once in November usually and again in spring. In winter I have to add a little bit, and in spring I take a little out. Usually only a psi or two.

 

At 35 psi, my E-rated Nitto Grappler MT's give me 900 lbs more capacity than my axle ratings. It's a heavy, stiff tire.

That's the lowest psi they're rated at in the load inflation table, and that's what I run them at. If I towed I'd air up, if off-road I'd air way down.

I ran my 35" Toyo MT's at 41/35 in my 3/4 ton when empty. This was a 7800 lb truck. But aired up to max when towing my 42-foot fiver...I grossed over 23k lbs with that setup. I was still well under the tire rating but liked the stability.

I aired down to 18 psi when wheeling in the desert, and that was a lot of high-speed hardpck.

Any lower than 15 psi and the risk of popping a bead goes way up, this was straight from a tire engineer at Toyo.

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50psi all the way around.

You guys running 30-40psi in your LT tires are killing your gas mileage

 

Have you chalked your tread contact pattern? I found with my tires, I originally had them at 45psi and they were good for about the first 1k miles. Then the tread pattern went to a heavy center contact. So I would be wearing the center faster.

So I dropped to what I run now and it is perfect, even contact. I noted no fuel milage change due to air pressure.

 

50psi all the way around.

You guys running 30-40psi in your LT tires are killing your gas mileage

So you're saying I should be seeing a lot more than 18mpg combined with 33" MT tires?

I saw 20 mpg combined with the factory Goodyears.

Between the MT tire being both larger (which affects mpg accuracy negatively) and significantly heavier, I can't imagine I'd get a significant bump with +20 psi...

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Sill for sure handle better with 45ish psi

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I called Michelin and told them what tires I was running and they gave me a recommendation.

 

Also; is it important to exchange Summer air for Winter air in the tires???? :?

 

Its critical. I also run a bunch of deck screws into the tread lugs to aid in traction on ice.

 

Also; is it important to exchange Summer air for Winter air in the tires???? :?

Dumb question.. of course it is important!
If you drive with Summer air in there in the winter it could cause the tire to split the belts inside due to warm Summer air inside against the colder Winter air outside.
Winter air in the Summer isn't as bad but still it should be changed out just as good habit.

 

Don't forget to rotate the air in your tires every 5k miles.

Once the air becomes accustomed to one tire, it starts to lose interest and mileage suffers.

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40-45 always. No matter the load. They don't like lower pressures.

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So I should be running higher than 32 in my 295/55 Ridge grapplers?

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What, nobody falling for the nitrogen gimic?

 

45psi in my 285/70/17 LT tires. I tried to run 40 but felt they didnt have enough stability and 50 psi made them a bit rough riding. Course I do have bilstein shocks too.