Tire PSI

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Flryder

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Bradenton, Fl
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2012
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4.7
Hi, I have load range E tires on my Ram. The stock inflation pressure is 40 PSI. Load range E tires can go to 80 PSI to increase their weight carrying capacity. I tow a RPOD 192 that weighs (empty) about 3500 pounds and has a tongue weight of about 440 pounds. How should I determine how much to inflate my rear tires to?
 

lpennock

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Phoenix, AZ
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5.9L & 6.7L Cummins
Correct way is to take truck to a CAT scale and get actual weight. Once you have the actual weight you can check TRA load tables for correct pressure to carry the actual load.

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JRS950

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Correct way is to take truck to a CAT scale and get actual weight. Once you have the actual weight you can check TRA load tables for correct pressure to carry the actual load.

Sent from my SM-T350 using Tapatalk
This the best way to determine tire pressure. Excellent advice.
 

Quyonmob

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Here’s a calculator to set your new tires to the same load capacity as the OEM door sticker tires. Great place to start the chalk test.

https://tiresize.com/pressure-calculator/

the differences are surprising, my results were (for an oem door sticker of P265/70/17 @ 40psi):
265/70/17 115 (notice no “p”) = 34psi
LT265/70/17E 121 = 47psi

this will ensure your new tires are inflated to carry at least the OEM GVWR.
 
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