Ideal Tire Pressure for 35" Tires

[brianinca]

Sounds like yet another application for the old Seek Thermal Compact!

I’ve used this formula for awhile now, post #16:

https://www.jeepforum.com/forum/f15/tire-pressure-equation-342704/index2.html

I then take a 5 mile highway drive and check the temps across the tire with a temp gun similar to this:
https://us.amazon.com/General-Tools...mp+gun&qid=1634002221&sprefix=rc+temp+&sr=8-5

I have one leftover from my Nitro R/C days.

Temps should be within a degree or two when measured on outside edge, middle, and inside edge. Higher in the middle is over inflated, higher on the edges is under inflated.

Doing this has worked well for me regardless of load range or diameter of the tires. It’s time consuming, but worth it in the end, and more reliable than the chalk test.

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[Aonarch]

I’ve used this formula for awhile now, post #16:

https://www.jeepforum.com/forum/f15/tire-pressure-equation-342704/index2.html

I then take a 5 mile highway drive and check the temps across the tire with a temp gun similar to this:
https://us.amazon.com/General-Tools...mp+gun&qid=1634002221&sprefix=rc+temp+&sr=8-5

I have one leftover from my Nitro R/C days.

Temps should be within a degree or two when measured on outside edge, middle, and inside edge. Higher in the middle is over inflated, higher on the edges is under inflated.

Doing this has worked well for me regardless of load range or diameter of the tires. It’s time consuming, but worth it in the end, and more reliable than the chalk test.

That formula gives me 24 psi FOR MY RIG, which is way too low.

 

[rafaelsmith]

I’ve used this formula for awhile now, post #16:

https://www.jeepforum.com/forum/f15/tire-pressure-equation-342704/index2.html

I then take a 5 mile highway drive and check the temps across the tire with a temp gun similar to this:
https://us.amazon.com/General-Tools...mp+gun&qid=1634002221&sprefix=rc+temp+&sr=8-5

I have one leftover from my Nitro R/C days.

Temps should be within a degree or two when measured on outside edge, middle, and inside edge. Higher in the middle is over inflated, higher on the edges is under inflated.

Doing this has worked well for me regardless of load range or diameter of the tires. It’s time consuming, but worth it in the end, and more reliable than the chalk test.

Hmm...i question that formula. Using it I get 28psi for my OE Falken MTs which is way to low. Unless I misread something.

 

[Wheelin98TJ]

That formula gives me 24 psi FOR MY RIG, which is way too low.

Hmm...i question that formula. Using it I get 28psi for my OE Falken MTs which is way to low. Unless I misread something.

The formula is just a guide like the chalk test is.

Gives you somewhere to start, but you should also consider how it feels and handles.

 

[rafaelsmith]

The formula is just a guide like the chalk test is.

Gives you somewhere to start, but you should also consider how it feels and handles.

Understood....Being 10+ PSI off seemed odd.

 

[Wheelin98TJ]

Understood....Being 10+ PSI off seemed odd.

Jeep says 38+ for your tires?

Likely for better MPG.

 

[rafaelsmith]

Jeep says 38+ for your tires?

Likely for better MPG.

I was off a tad in math...Door says 37.
Formula came out to 28. (Tire rating 2755@50. weight 6252)

So diff of 9.

I have been running them @35PSI which is what I roughly got with chalk test.

 

[freebird_78]

Diesel on 35s here.

Chalk test says 34 front, 31 rear.

 

[Northshoremb]

Just found this thread So I'll have to do chalk test. Just had 37" Kanati Trail Hog AT install which are load E and I was driving around first 2 days wondering why no ture hum and suspension felt hard as well as some vibration. Went and tested the PSI to be shocked they had 52psi ...wtf. lowered to 36 and now some hum plus no vibration and softer suspension

 

[OldManOfTheSee]

I’ve used this formula for awhile now, post #16:

https://www.jeepforum.com/forum/f15/tire-pressure-equation-342704/index2.html

I then take a 5 mile highway drive and check the temps across the tire with a temp gun similar to this:
https://us.amazon.com/General-Tools...mp+gun&qid=1634002221&sprefix=rc+temp+&sr=8-5

I have one leftover from my Nitro R/C days.

Temps should be within a degree or two when measured on outside edge, middle, and inside edge. Higher in the middle is over inflated, higher on the edges is under inflated.

Doing this has worked well for me regardless of load range or diameter of the tires. It’s time consuming, but worth it in the end, and more reliable than the chalk test.

Thanks for this link! Used it to determine 32psi with my Maxxis Razr AT 35x12.5r17 is what should be best.

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