Correct tire psi. Ridge Grappler 33 12.50 R17 LT load range E - Jeep Wrangler Forum
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Old 11-21-2019, 09:19 AM
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Correct tire psi. Ridge Grappler 33 12.50 R17 LT load range E

Have these on my 2017 rubicon unlimited and keep getting different answers as to proper PSI for normal everyday use and what to use for trails, nothing crazy. Thoughts please? Thank You in advance

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Old 11-21-2019, 09:43 AM   #2
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28psi is a good starting point for the road and 15psi off.

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Old 11-21-2019, 09:48 AM   #3
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people recommend the chalk test but that has never worked for me with an e rated tire as I get the same chalk pattern from 10psi to 40 ps. What I uses is the 10% method if your psi rises 10% from cold psi to warmed up psi ie 10 miles on the highway it is good ie for simple math if cold 30psi goes to 33psi you are good to go 30 X .10=3 30+3 =33
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Old 11-21-2019, 10:06 AM   #4
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As a point of reference, I run Goodyear Duratrac 315/70R17s and maintain 26 PSI cold. On trails, 15 PSI. Nittos have a much harder compound, you need to run them low, otherwise you’ll end up with a bouncy ride. Start with 30 and go down gradually until you find the sweet spot.


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Old 11-21-2019, 10:22 AM   #5
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I run my Nitto Trails (35x12.5 17s) at 28psi on the highway and 11psi on the trail. Hope that helps.
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Old 11-21-2019, 11:11 AM   #6
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I emailed Nitto after weighing my Unlimited and they told me 26 psi front and rear for my E rated 35x12.50 17 Ridge Grapplers


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Old 11-22-2019, 02:22 AM   #7
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Even though I don't run Nitto's I run 26 psi in the summer and 28 psi in the winter.

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