PSI Tire pressure recommendation

[NightHawk2025]

Just put on new shoes for my 2025 gladiator nighthawk wondering what would be the proper psi for LT295 /70 R17
They set them at 41 psi any recommendations?? Thanks for any help !

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[Camaroboi13]

Jump on YT and look up how to chalk test your tires. Not every wheel and tire combo will be the same.

 

[smlobx]

41 is definitely too high. Why don’t you drop it to what is shown on your B pillar to start?

 

[Gvsukids]

Jump on YT and look up how to chalk test your tires. Not every wheel and tire combo will be the same.

Or how the truck feels with the shocks and springs.

 

[Metalhead]

I always start with the psi listed on the door jam sticker and adjust from there.

 

[Q Tip]

My door sticker on my 2025 Nighthawk with 275/55/20 General Grabbers specs 36psi but as received from dealer were 43 psi on the drivers side and 40 psi on the drinker side...truck felt a little twitchy on the road. Reset to 36 psi....truck is tracking noticeably better.

 

[ShadowsPapa]

My door sticker on my 2025 Nighthawk with 275/55/20 General Grabbers specs 36psi but as received from dealer were 43 psi on the drivers side and 40 psi on the drinker side...truck felt a little twitchy on the road. Reset to 36 psi....truck is tracking noticeably better.

Dealers, including tire dealers, for some reason, usually jack them up way too high.

And - I don't understand why when there's those recommended tire pressures for those tires on that truck listed right next to a person when they get in or out of the truck, that sticker is ignored.
It's right there in plain view.
unless the tires are non-stock or the truck is loaded down with heavy accessories, go by that. It gives the best wear.
The chalk test has been a big failure for me on my General tires I had on 2 other JTs.
I finally called General and talked to a consumer engineer and we figured it out - and it was right about where I assumed it should be based on the size difference from the original tires.

Just put on new shoes for my 2025 gladiator nighthawk wondering what would be the proper psi for LT295 /70 R17
They set them at 41 psi any recommendations?? Thanks for any help !

40 is too high for ANY Jeep tires that come with them from the factory, and if the tires are wider and/or larger diameter, that means larger footprint, so lower PSI than stock.

In short - WOW, that's WAY too much.

I always start with the psi listed on the door jam sticker and adjust from there.

Yes, but, he has different tires than stock.
If they are wider or taller or taller and wider, it would be lower than the door sticker.
Air supports the tire - psi pressing down on a footprint that is xx square inches.
So assume a truck of 5500 pounds, that's 1375 pounds per tire if all things were equal.
35 psi would give a footprint of about 40 square inches per tire.
so a person can pretty much figure out what that footprint is supposed to be (ask the tire maker) and figure the air pressure from there based on the weight of the truck.

 

[bd100]

Our old pickup's manual has a table for tire pressures. Depending on the stock tire size, start at X, add some more pressure for highways speeds in summer, and add even more pressure if towing.

In our case while heavily loaded, plus towing, plus summer, plus highway speeds, the LT tires of stock size, at the back, were getting too warm for my liking at 40psi. I raised them to 50 and they ran as cool as the front. So they stay at 50psi because we tow or do highway speeds fairly often, and they're still stock-ish size (32"). Likewise, on our old truck we run around 45-50psi all the time and the tires last forever and have decent wear patterns.

So if hauling or towing check the sidewall temperatures and go ahead and add pressure if needed.

 

[Chasm]

My Nighthawk says 36 on the pillar, but came at 40 on all four corners and handles better than I expected anything that sits this high to handle.

 

[HorsesRear]

35

 

[Zachanadandy]

30 psi unless loaded up heavy. Don't need anymore than that and it rides better.

 

[ShadowsPapa]

Our old pickup's manual has a table for tire pressures. Depending on the stock tire size, start at X, add some more pressure for highways speeds in summer, and add even more pressure if towing.

I'm afraid I'd toss that manual out in the recycle bin..

You don't add pressure for highway driving, and you don't add for summer. Highway driving in hot weather automatically raises the pressure.
You check cold (meaning 60-70 degrees).
I sold and installed tires over the years, and never seen such a thing as that, and I'd absolutely ignore the bit about adding for highway driving.
The recommended pressure IS for that sort of thing.

Add based on LOAD - yes. That's the whole point I've made - keep the same footprint regardless of load means add pressure for heavier loads, reduce it back down to normal for curb weights.

If you start out CORRECTLY at 36 psi, for example, depending on tire size and truck weight, as you drive, it's going to increase. A highway trip of say 10 miles in 80 degree weather will end up with pressures around 39-40 in many cases. But you don't ADD to get there.

 

[Metalhead]

Yes, but, he has different tires than stock.

Doesn't matter to me what tires they are. I still start at what the door sticker says. I have never had any issues running non stock tires at the door sticker psi number. I will be putting 35 inch tires on my gladiator this week and will run them at the same pressure as what the door sticker says.

 

[Dougstdig]

Just put on new shoes for my 2025 gladiator nighthawk wondering what would be the proper psi for LT295 /70 R17
They set them at 41 psi any recommendations?? Thanks for any help !

https://tiresize.com/pressure-calculator/

 

[Chasm]

I have never had any issues running non stock tires at the door sticker psi number

It really does rely mostly on vehicle weight. The contact patch is not THAT different from one tire size to another, within reason, but that's where any variance is.

When I was a teen I had a swamper Ford Ranger. So much tire that at 5psi you could barely tell it was low by looking at it. Driving on the other hand, you could tell.

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