Airing up tires on a cold day...

[Splenda]

My tire pressure dropped to 33 psi in all my tires, so I aired them up to 39 psi on a day when it was below freezing. Today, the temps were in the 50s, so I guess I'm overinflated now.

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[D_JT]

Well, yeah. That's normal. Temperature effects pressure. But with over sized tires, 33 PSI is about right.

 

[fourfa]

https://en.wikipedia.org/wiki/Boyle's_law

 

[Splenda]

Well, yeah. That's normal. Temperature effects pressure. But with over sized tires, 33 PSI is about right.

I have played around with the pressures to see what I like best. They are Toyo Open Country M/T 37x13.5x17 and are E rated, so I think they ride better around 38 psi. What I lose in a slightly rougher ride I make up for in handling. 33 is just a little too squishy for me. I can really tell a difference in turn-in.

 

[D_JT]

I have played around with the pressures to see what I like best. They are Toyo Open Country M/T 37x13.5x17 and are E rated, so I think they ride better around 38 psi. What I lose in a slightly rougher ride I make up for in handling. 33 is just a little too squishy for me. I can really tell a difference in turn-in.

Thats interesting. On my diesel I run D rated 35" Toyo Open Country R/T Trails at 32 PSI. They ride perfect. 37 PSI or higher and it feels like its on skates. Same thing on my wifes JL. 35" Toyo AT3's D rated. 32 psi is the sweet spot. Anything higher and it wonders.

 

[White Eagle]

I aired down to 26lbs before there was any change in a measuring tape concerning height or appreciable flex over rocks. It DOES NOT warrant “C”rated tires either.

i’d say stock is “overinflated”

The engineers putting the TP on a Gladiator at 37lbs are as wrong as men competing in women’s sports.

 

[Splenda]

I aired down to 26lbs before there was any change in a measuring tape concerning height or appreciable flex over rocks. It DOES NOT warrant “C”rated tires either.

i’d say you aren’t “overinflated”

The engineers putting the TP on a Gladiator at 37lbs are as wrong as men competing in women’s sports.

I agree. The stock tires are great around 32 psi. The Toyo's I have on my truck are really stiff and ride the way I like them to at about 38 psi.

 

[White Eagle]

I agree. The stock tires are great around 32 psi. The Toyo's I have on my truck are really stiff and ride the way I like them to at about 38 psi.

Instead of getting a jscan to change tp to get rid of the TPms light, I just look at the light now as check my Tires are ready

TP swings are ridiculous here, we have 35 degree daily swings. I’m currently running 28lbs at 50 degrees.

The whole tires heat up if your pressure is too low thing is overrated and a farce too. Don’t believe it, let them run low and see how much TP changes on a hot pavement ride, maybe 2lbs or so until it levels off and stops increasing.

 

[Splenda]

Instead of getting a jscan to change tp to get rid of the TPms light, I just look at the light now as check my Tires are ready

I wish I could do that, but I usually keep my screen up that shows the pressure of all four tires. I feel the need because I run beadlock wheels and just don't trust them.

 

[White Eagle]

It ain’t for everyone.

 

[Neomonk21]

https://en.wikipedia.org/wiki/Boyle's_law

PV=nRT is one thing I remember from high school physics.

 

[Splenda]

PV=nRT is one thing I remember from high school physics.

Yep!

 

[Eating Raoul]

I run load range E tires on my other trucks, those are usually aired up to 60 but the tire can go as high as 80 - more plies, more rubber. I guess I have to get used to low pressures again with this Jeep :D

I started paying attention to this when I had two identical tire failures - good tires too, not some cheap stuff - on a pickup. Load range E aired to 35 psi by the installer, got tears inside from flexing over rocks and stuff (best guess). Lesson learned, air pressure does matter depending on what that tire is for - cargo or passengers.

 

[Sandman 4x4]

I aired down to 26lbs before there was any change in a measuring tape concerning height or appreciable flex over rocks. It DOES NOT warrant “C”rated tires either.

i’d say stock is “overinflated”

The engineers putting the TP on a Gladiator at 37lbs are as wrong as men competing in women’s sports.

Manufacturers using PSI over 32, on any stock sized tires are doing so, like 35psi in the door jambs, are for meeting the EPA mileage requirements is all. Actual rule of thumb is to check weight rating on sidewall at max PSI, let’s say for sake of argument that says 2,200 lbs. so that time 4 equals 8,800 lbs at 45 psi. Then weight the vehicle say that comes to 4,400 lbs with you inside and full tank, that means the tires are over rated at the max psi. That means at half the psi you are safe. For weight purposes, but your dynamics are fuel economy will suffer, so a happy medium would be best. Say instead of 25psi, at 32 will be just fine.

 

[BuckeyeButch]

I've used Nitrogen for years and don't have to deal with the tempter swings.
Unless you've tried it don't knock it.

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