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Old 04-13-2014, 03:16 PM
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need help with correct tire pressure on new tires

I have a 2011 Jeep Wrangler Unlimited. I just replaced the stock tires with these: Nitto Trail Grappler M/T size: P255/75r17
I spent a fortune on these (for me, anyway) and want to take care of them. The tire dealer suggested 35-38 PSI. I want to make sure.
Here are the specs on the new tires:
Max Load 2405 lbs
50 PSI

The sticker on the door has this weight information for my Jeep:
Front GAWR 2775 lbs
Rear GAWR 3200 lbs
GVWR 5400 lbs
It recommends 35 PSI, but this is for the stock tires (which have these specs: max load 2535 lbs with 44 PSI)

I have looked all over the internet, but all I find are the correct pressure for the stock tires, which I already know to be 35 PSI, based on the sticker.

My new tires are the same size as the stock ones, but have different ratings, as shown above.

What do you guys recommend the PSI for my new Nitto tires, for regular street and highway driving?

Thanks! I love these tires so far (they ARE very quiet just like they advertised). I can't wait to go off-roading with them this summer.

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Old 04-13-2014, 03:25 PM   #2
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The air pressure listed by the manufacturer is selected to maximize load carrying capacity and fuel economy. Many Jeep owners run lower pressure. A lot of them us the chalk test to select tire pressure because it optimizes the tire footprint and therefore provides even tire wear. The chalk test provides a range of PSI, I would recommend staying on the high end of the range to also maintain fuel economy. The chalk test usually results in 25-28 PSI for 32"+ LT tires.

There are also those that select tire pressure for ride comfort and sometimes that is closer to the 25 PSI range.

The difference between the chalk test and the manufacturer recommended air pressure can account for as much as much 1 MPG. The bigger and wider the tire the larger this range, so you decide where you want to spend your money.

Many owners seem to focus on tire care on the road but worst enemy of tires are heat (which peaks when airing down for extended periods) and rocks.

Make sure you rotate your tires regularly.

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Old 04-13-2014, 03:52 PM   #3
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I have Goodrich KM in the same size 255/75x17 I run 34 psi
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Old 04-13-2014, 05:35 PM   #4
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Try 28-30 and see how they feel and look. I run my stock KMs at 30 and my 35" MTRs at 24ish.
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Old 04-13-2014, 07:16 PM   #5
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Quote:
Originally Posted by HK_Runner View Post
Try 28-30 and see how they feel and look. I run my stock KMs at 30 and my 35" MTRs at 24ish.
Do you adjust with temp?

My E Rated are at 24 cold but warn up to 26 psi.

Today (2nd day 70+) they checked in at 29 psi. A little harsher driving.
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Old 04-13-2014, 08:05 PM   #6
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I did on huge temp swings on my 2-door with the MTRs but that was a sensitive setup. The 4-door is much less sensitive but I still have my stock KMs on. The 35s go on next weekend. I do adjust for altitude when I travel.
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LOD front bumper, AEV rear bumper, TeraFlex tire carrier, Shrockworks sliders, Mopar Big Brake Kit, Method The Standard wheels, 35" MTR Kevlars, Englewood driveshafts, Synergy 3" Lift, Rancho 9000XLs, Artec truss, Teraflex C-gussets, Grabars, HotHead Liners, JW Speakers, MORE dead pedal, Tuffy underseat box, Uniden 520 XL, 10lb CO2 tank...
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Old 04-13-2014, 08:09 PM   #7
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Originally Posted by HK_Runner View Post
I did on huge temp swings on my 2-door with the MTRs but that was a sensitive setup. The 4-door is much less sensitive but I still have my stock KMs on. The 35s go on next weekend. I do adjust for altitude when I travel.
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Old 04-13-2014, 09:42 PM
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thanks for all the quick replies. Jeep owners are AWESOME! It sounds like there is no real set number or method to find the optimum pressure. These responses range from 28-35. I guess I will try the chalk test to see how the 35 PSI I am using right now looks, and go from there.
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Old 04-14-2014, 04:37 AM   #9
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http://youtu.be/ojGsavK0Uwc


This guy does a good job explaining go to do it. I did the chalk test to find my pressure. Best of luck!

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