So I got a set of cooper discoverer at3s in LT265/70/17 load c (50 psi). The tire shop set them at 42 psi and they feel soooo much better than the P metric tires I was running at 40 psi.

That said, what's the best psi to run this load C tires to get the best tread wear and life out of them? The most weight that's ever in my bed is about 300 - 400 lbs but it's usually just one trip a month.

Should I be running these tires closer to 50 psi? Or will 42 be ok?

My p metric tires at 40 psi had 55k miles on them and still could have have a couple more years of life. I want to get the same lifespan with the new tires. Thanks!

 

Hi.

Here ya go:

https://www.f150online.com/forums/wh...-tire-psi.html

https://www.f150online.com/forums/wh...light=pressure

https://www.f150online.com/forums/wh...-question.html

 

Around 40 should be fine for the tires you purchased. Ford recommends either 40 or 45 depending upon which LR C it installs as OLE equipment, so any where in that range should be good. Just keep and eye on wera and adjust as needed. I would not go any lower than 40.