Eco2014

My sticker on the door jam says 35psi. I have the stock tires on 275/65/18 GoodYears. And the last time I took my truck in for service they put 40psi. What's up with that?

ji603

I run 40 in the front, 38 in the rear, unloaded.

No tire roll during cornering and a little better mpg. 35 seems too low to me; the tires had such a wide footprint/bulge at that psi.

Eco2014

So I went and took air out to get them to 35psi. I've noticed that the edges of the tires seam rounded off to me

DavidKR

If the edges are worn that means they are under inflated. That's quite possibly why they aired them up higher, to try to even out the wear.

Eco2014

I don't know if you can tell by this picture. I guess I can do the old trick of using a piece of chalk and making a line across the tire and adjust the air

Steve Osborne

my goodyear at/s im running 40 f/r..
looks like your front is rolling over in corners rounding the edge...looks under inflated..

Eco2014

That's kinda what I was thinking. I went out an put the air up to 40psi all the way around. I'm going to go to the auto parts store in the way home and get some tire chalk and try the chalk trick

bigbad

35 max PSI COLD

That means it expands when your temps warm up, really depends on where you live. If you can maintain 40 psi through the day then youre good.

Eco2014

I live in missouri

gDMJoe

You're implying that you think that where you live pertains to "PSI COLD". It doesn't.

It simply means that the tires have been at rest and haven't built-up any heat as the result of running on the road.

"PSI COLD" does go up|down because of the ambient temperature changes, however, it's not related to a particular location/region. *And YA, I know the South is warmer (in general).
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