Another thread about tire pressure

[TrevorLS]

While pulling my 2024 JL XR with 35s into the garage, I noticed that only the center portion of the tire is making contact with the ground as you can see in the picture. Currently the low pressure sensor says to inflate my tires to 37. I have them inflated to 34. This tells me that I'm still running too high of pressure and should probably drop it to around 32 or 30. Searching on the forums it seems like most people with 35s are running around 32. Does this look like too much pressure? And if so, what's the easiest way to change the low pressure warning threshold.

Thanks!

Sponsored

 

[gsbrockman]

Due to some temperature swings recently, mine have basically been 31 to 32 psi cold, and only get up to about 34 psi warm.

I presume your 34 psi is per the TPMS screen? Have you noticed what they are cold?

 

[GrumpyOldVet]

I don't even have my 2024 yet and I suspect it's overpressure from the pic the dealer sent me.

I don't have experience with it yet but I think jscan is the budget option to reset the TPMS threshold. Guess I'll see how it rides before I get too worried about it

 

[Reinen]

I don't even have my 2024 yet and I suspect it's overpressure from the pic the dealer sent me.

I don't have experience with it yet but I think jscan is the budget option to reset the TPMS threshold. Guess I'll see how it rides before I get too worried about it

Yup. Overpressure.
Jeeps are shipped from the factory with overinflated tires to avoid flat spotting during storage and transport. It will ride much better once PSI is reduced enough to pass a chalk test.

 

[ParadigmDawg]

I run 29 cold in both of mine with 35s. Seems about perfect.

 

[TrevorLS]

Thanks for the replies all. That's what I suspected. Pakistan of the low pressure warning so I have to look into jscan to change the set point.

 

[Jeepin_OLB]

Have you done a chalk test on the tires? Every tire and Jeep is going to be a little different. Use chalk to mark a wide strip across the tread from edge to edge, then drive about 100 feet straight, and check the tire to see where chalk is worn off. Inflate/deflate tire pressure until the chalk is worn evenly across the tread. My tires (37s and 39s) ended up around 28 PSI cold and I just set the TPMS low to 25 psi.

 

[Delta Yankee]

How do you reset the TPMS? I've been running our 2023 HIGH-TIDE tires at 29 to 31 PSI.

 

[Deleted User 38384]

You do realize your entire tread is not supposed to touch the ground right?

I mean you can drop your PSI if you want, but your tires going to wear out quick as hell!

Only time I would recommend driving with lower PSI on the streets is if there's snow on the ground or ice. Otherwise there's really no point. You're just wearing out your tires quicker.

 

[gl420]

You do realize your entire tread is not supposed to touch the ground right?

I mean you can drop your PSI if you want, but your tires going to wear out quick as hell!

Only time I would recommend driving with lower PSI on the streets is if there's snow on the ground or ice. Otherwise there's really no point. You're just wearing out your tires quicker.

I agree, I think it's by design to not have the contact patch be completely to the edges when driving in a straight line.

When you're cornering on pavement, the tire deforms from the forces applied to it and that is when those edges come into play. You want it to still be the flat part of your tread and not your sidewall.

 

[SargeDiesel]

You do realize your entire tread is not supposed to touch the ground right?

I mean you can drop your PSI if you want, but your tires going to wear out quick as hell!

Only time I would recommend driving with lower PSI on the streets is if there's snow on the ground or ice. Otherwise there's really no point. You're just wearing out your tires quicker.

@Tredsdert & @gl420

Your onto something here.
On my 37's, I noticed the same thing as the OP when diving on a gravel road. It was basically the same as doing a chalk test. After driving on the gravel road, the entire tire was white, so once pulling onto the regular paved road, I could see the wear. It was very close to the OP's pic (maybe a little closer to the edge, but not much).
* note: I did an actual chalk test and got the same results.

I was initially running around 35/36 in the front an 31/32 in the rear(JTRD)....
After the gravel road/chalk test, in order to allow the entire tire patch to touch and wear on the pavement, my psi had to be lowered to around 31/32 in the front and 27/28 in the rear... after driving this way for a couple weeks I noticed 3 main issues.

1. The ride wasn't as comfortable. (More noise and grabbing in the corners.
2. I lost 1-2 mpg.
3. My front tires started feathering around the edges, basically the outer patch that had the new contact due to the lower psi.

I have since raised the pressure and #1 & 2 are resolved.
To address #3, I have plans for @Discount Tire to do a roadforce balance and while the tires are off, a rotation. Hopefully this will get my wear back on track.

@Discount Tire any current Roadforce balance/rotation forum promo discounts / or Military Discounts ?
Thanks

 

[TrevorLS]

You do realize your entire tread is not supposed to touch the ground right?

I mean you can drop your PSI if you want, but your tires going to wear out quick as hell!

Only time I would recommend driving with lower PSI on the streets is if there's snow on the ground or ice. Otherwise there's really no point. You're just wearing out your tires quicker.

I hadn't thought about that, you make a good point. I had seen a few videos of people doing the chalk test and they try to get all of the tire to make contact. Thanks for the extra points.

 

[Deleted User 38384]

...or Military Discounts ?

It all makes sense now! ? @SargeDiesel SARGEdiesel!! ?

 

[SargeDiesel]

I hadn't thought about that, you make a good point. I had seen a few videos of people doing the chalk test and they try to get all of the tire to make contact. Thanks for the extra points.

Thats what initially threw me off.

 

[SargeDiesel]

It all makes sense now! ? @SargeDiesel SARGEdiesel!! ?

Ha ha.... its two fold...
Military for sure and the reason I wanted a "Sarge" Green JT.

This is a closer look:

Sponsored