Cooper discoverer st maxx

[Fearless black ram]

I am new to this forum, and I would love to get an answer to my tire question, I bought a set of cooper discoverer st maxx 275 65r20, and I wanted to know how much psi people were running in this larger tire. The truck door jam says 39 psi, but do I keep following that since I got bigger tires

 

[Rampant]

I am new to this forum, and I would love to get an answer to my tire question, I bought a set of cooper discoverer st maxx 275 65r20, and I wanted to know how much psi people were running in this larger tire. The truck door jam says 39 psi, but do I keep following that since I got bigger tires

I am running 35x12.5x20 Falken AT3Ws on my '16 2500. Factory says to run 65 front/80 rear. After much exprimentation, I ended up running 50 all the way around. Any less and the truck felt like I was riding on flat tires and was noticeably robbing power. Any more than 50 feels too stiff and the tires "mound up" in the middle so much that the outside lugs never touch pavement. I verified this by driving on a fresh white pea gravel driveway.

But, you're dealing with less weight, so you may need to experiment as well. Most importantly, watch your treadwear closely. You'll be able to tell where that sweet spot is for your particular combo if you take the time to test a few different pressures.

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