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Northern Virginia Jeepers Association
December 11, 2017, 07:29:08 PM

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Author Topic: PSI for 35x12.50r17  (Read 232 times)
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InkedKnuckles
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« on: December 01, 2017, 04:36:20 PM »

What is a good PSI to run on these size tires? I have a 15 JKU with a heavy front and rear bumper. The tires themselves are goodyear duratracs.

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nosigma
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« Reply #1 on: December 01, 2017, 04:53:22 PM »

Get the reccomended tire pressure at the rated weight.  Get the weight on each tire.   Divide actual weight by rated weight.  Multiply the pressure at rated weight by that ratio.

That gives you a STARTING POINT.  Starting with that pressure take the pressure up or down 4 or 5 psi and see what feels good on the road with sharp steering inputs.  Depending on the tires you might end up between 20 and 30 psi, lower end if the rated weight is high, higher end if you vehicle is heavy or rated weight is low.

Road stability and a flat contact patch (no tread crowning) is what you want.

John

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nosigma
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« Reply #2 on: December 01, 2017, 04:56:48 PM »

Seen a lot of jk's at 45 and 50 psi because thats the pressure on the sidewall.  That is the pressure at rated weight is usually way to high unless you literally have tons of crap added to your rig

John

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VirginiaZJ "Frank, Stop. Don't come down here"
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VirginiaZJ "The front of his Jeep is facing me now"
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ogre45
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« Reply #3 on: December 01, 2017, 06:28:05 PM »

28psi was the sweet spot for my 2 door JK on 35's

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Alex
1969 Jeepster Commando in work
z4iken
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« Reply #4 on: December 01, 2017, 08:07:36 PM »

I run at 32 cold on my Nittos


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The Jeremy Theorem: Just buy 35's the first time
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Iceman
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« Reply #5 on: December 01, 2017, 08:11:33 PM »

I run between 28 and 30 psi on my 2 door that has a hard top, steel bumpers, skids and a winch. Seems to be right on point with comfort and tread wear.

-Clayton

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Silversurfer
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« Reply #6 on: December 02, 2017, 08:01:09 AM »

I run 28psi on a built JK w/35's

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drekalots
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« Reply #7 on: December 02, 2017, 05:52:17 PM »

Running KO2’s at 30psi on my JKU.


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InkedKnuckles
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« Reply #8 on: December 02, 2017, 06:42:43 PM »

Thanks for the info guys. Installed them today, set them to 30. Ill spend the next week trying different psi's and find what feels best. 30 definitely feels great right now though.

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drekalots
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« Reply #9 on: December 03, 2017, 07:52:35 PM »

Do a chalk test. Easiest way to find out.


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VA6489
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« Reply #10 on: December 07, 2017, 07:28:28 AM »

Had the same question  when I was shopping for a lift kit.  Engineers at Metal Cloak told me they run between 24 and 28 PSI on road and lower off road depending on rims.

Cheers
Rob

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Cheers
RRR
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