Posted by Muhanad on November 28, 2016

I had the OEM tires P265/70R17 with door label 40 psi. I bought LT285/70R17 on my Dodge Ram 1500 Crew Cab Hemi 4x4. What is the correct psi for the LT285/70R17?

Answers / Replies
  • Posted by Serge on December 01, 2017

    When you equip our vehicle with a different tire size, you have to check tire load inflation table to find proper tire pressure value for your new tires. You do that by comparing maximum load capacity of each tire size and finding their appropriate tire inflation values. In your case your original tire size of P265/70R17 and recommended tire pressure of 40 psi has load capacity of 2403 lbs. Since you are replacing a P-Metric tire with LT-metric tire, tire load capacity is multiplied by 1.1 so your new tire size of LT285/70R17 has load capacity of 2643 lbs. On load inflation chart for LT285/70R17 tire size find corresponding load that is equal to or greater than the OE tire which is 50 psi at 2755 lbs for single tire, or 55 psi at 2640 lbs each tire for dual rear tires. There are your new recommended tire pressure values for your new tire size.

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