Best Tire Pressure for Comfort/Wear/Mileage for Stock 33" A/T Tires

[Sweetums]

I just bought my JTRX in January and I've been running the stock 33" A/T tires at the door jam recommended 37 PSI
As we head into hot weather, I find it hard to believe a cold reading of 37 PSI is going to be comfortable or wear appropriately.
What have people reported as the right year-round PSI for the stock 33" ATs?

37 PSI.

A lot of really smart people who have decades of combined experience relied on a lot of science and math to put that sticker on your door jamb. You are running OE tires in the OE size on a stock vehicle - use the recommended pressure.

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[Reddog]

Yes, we agonize over tire pressure. Maybe be need another "which brand of oil" is the best to complement the tire pressure debate.

Gosh, don’t get me started here

 

[jav_eee]

The pressure needs to change as the load and use changes.

so ideally you’d make sure your tire pressures are good when your load changes significantly, right?

If you haul loads or tow heavy loads the pressure needs to be up at manufactures numbers.

Again, not if you’re running any tire OTHER than what came stock. Larger tires are usually different ply which also mean different carrying capacities at different PSI.

 

[van_tri]

Yes, we agonize over tire pressure. Maybe be need another "which brand of oil" is the best to complement the tire pressure debate.

Sorry for creating a useless thread Dave … Wouldn’t want to waste bandwidth like announcing I bought a JT and then not posting a photo of it LOL!!!

 

[Mr Miami]

Sorry for creating a useless thread Dave … Wouldn’t want to waste bandwidth like announcing I bought a JT and then not posting a photo of it LOL!!!

OK, OK, took me a week. You got me there.

 

[ShadowsPapa]

so ideally you’d make sure your tire pressures are good when your load changes significantly, right?



Again, not if you’re running any tire OTHER than what came stock. Larger tires are usually different ply which also mean different carrying capacities at different PSI.

I do.
When I tow, I adjust rear tire pressure to compensate. The idea being to keep the same footprint on the ground.
If I'm hauling something heavy in the back, I adjust.
I don't do a lot with the front tires as my towing doesn't involve any weight distribution and in fact, a bit of weight comes off the front.
I adjust for winter as I've actually found better traction in our winter conditions when the tires are adjusted, and, of course adding the plow weight matters.

Having sold and serviced tires for years long ago in my early career days, I learned from delivery drivers and other pros. We were really nagged about correct and even pressure when selling and installing tires..
I guess it stuck with me all of these years. I have only once had tires wear badly before their time and that was on a car where you couldn't properly adjust the front alignment due to other circumstances.

For non-stock, I go by what the tire maker says. (as in my conversation with the "consumer engineer" from General)

 

[Splenda]

On a cold day, my tire pressure starts out around 38 psi and might hit 40 psi. It's not unusual for them to hit 42 psi on a warn day. I'm going to need to let a little air out of them once the weather stays above 70 degrees.

 

[Gizmo]

I do mine a little different being temps change so much and its heated garage . I just check them on the instrument cluster when I have been driving at speed for a while . I try to keep mine around 33-34 during the average temps that season. Mine is garage kept at 65 degrees at the coldest so my cold temp don't tell me anything when its 5 out side. If it starts to run a little on the low side I just adjust it up or down when I get in the garage . That has always kept me as close as my tires need to be

 

[HueCity0846]

For me 38 cold highway and 25 cold on FS roads. Low pressure much better on dirt roads.

 

[Reddog]

so ideally you’d make sure your tire pressures are good when your load changes significantly, right?



Again, not if you’re running any tire OTHER than what came stock. Larger tires are usually different ply which also mean different carrying capacities at different PSI.

Dont want to argue this. Do what you want.

 

[jav_eee]

Dont want to argue this. Do what you want.

You don’t have to

 

[Splenda]

There is no right answer.

 

[Hootbro]

My last two Rubicon JT's when I had the stock 33's on them, I ran 32 PSI and felt that gave the best overall ride quality for day to day driving.

 

[Stan H]

My opinion and a 2.50 will buy a soda pop at the gas station, but I run between 30-32 psi in my 35's I like a flat level surface across the tire , as you mentioned to increase the longevity of the tire and give increased traction on road. Off road obviously you need more flex and a reduction in air pressure while off roading always helps a smidgen. Just dont forget to air back up before getting back on the hard top.

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