New PSI Rating ?

[Mud Pie]

Well, I just put on BFG 265/70/17 K03's, Class C. Anyone know what the PSI should be ? I did an online search and the numbers varied greatly. Some said 34, some said 36, some said 38. One guy said 80 because that's the max rating on the sidewall. I'd bet that if he has any fillings in his teeth, he doesn't anymore.... I searched on here, because you guys know of which you speak, but I couldn't get an answer (my Search-Fu skills are lacking)

My tires are currently at 38, as set from the tire dude NTB. What would be the correct number ? Is 38 right ? I'm going to print a label and stick it on my door jamb because whatever info I glean here will be forgotten in a few months....

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[Sweetums]

Just do 37-38 PSI for the street.

 

[Bandit’s Lair]

About the same here. I think when I did the 4 tire air up I set to 36 and they usually warm up to around 37 on my normal run and 38 when I hit the hiway. That’s for a 37” though so a bit more sidewall. If you can, run em at a few different pressures and see where they are comfy and good on corners for the road. Road conditions are different everywhere so that always plays into comfort levels. I get a little bit of “feedback” in corners if I set them much lower than I have them now.

Side Note: double check the spare too. Tire place that mounted my spare set it to 40 per the TPMS. It was a noticeable difference after my first rotation. Thought I forgot to torque lugs or something.

 

[XraytecH]

My test also came out to 30 cold on Goodyear 35s DuraTracs. Not recommended for tires like Milestar Patagonias, that have a crowning tread.

 

[Freems]

I have 35” 12.50 on 17” 12 ply MT 80 psi rated, for round town and highway trips I run 40 psi. Hauling the 18’ dove tail trailer with a good load I run the rears up around 50 psi. Hauling the jet boat 18’, coolers full, 50 gal fuel tank full, 45 psi rears. Dirt…20 psi to 35 psi depending on speed.

 

[Vtur]

Wheel’s width also affects ideal psi. With the same tires, narrower wheels require lower pressure for an even wear across, but risk running them hot and wears out sooner. Opposite for wider wheels. I’m running 30psi with 37x12.5 tire on 8.5” wide wheels. It has around 40k miles on it and it can probably go another 20k+ miles.

Only way to find out is testing them. I drew a few lines across the treads with a silver sharpie, shoulder to shoulder with 1” spacing. Started with the door psi label, drove around and gradually lowered down couple psi at a time until it wears nearly to the edge.

27-28 psi would uses up the whole shoulder treads, but they ran hotter and slower steering respond, so i chose the happy medium 30 psi.

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