37x13.50r17 mud grappler psi - Jeep Wrangler Forum
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Old 04-19-2013, 06:20 PM   #1
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Join Date: Jan 2013
Location: Keller, TX
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37x13.50r17 mud grappler psi

I am the new owner of a set of 37x13.50r17 Mud Grapplers, discount tire filled them all up to 42psi which seems high. it rides well. my question (because I havnt been able to find any info) is what psi should I be running for best tire life?

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Old 04-25-2013, 09:48 PM   #2
Join Date: Sep 2011
Posts: 233
I run 28psi with my 37x12.5x17 Cooper STT

You will only get an accurate reading by doing the chalk test.

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Old 04-25-2013, 10:09 PM   #3
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Location: Keller, TX
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Thanks, I'll look into that. I dropped it down to 35 which feels a lot better. I'm assuming I just put chalk on the lugs and see what pressure gives me the most contact?
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