Ok, I have been running my tire at 36 psi. But I have read a few things, saying some tires are running at 80 psi.

That's a big difference and I'm wondering if I'm running ridiculously low, if the 80 psi is just an advirtising ploy, or if it's a manufacture variable.

I know most cars recommened 30-32 psi or so, so I figured my truck would be ok at 36. If I've been misinformed let me know.

Granted, I have yet to be able to read the psi rating for my Stampede tires. A shame I know, but either they are too cheap and didn't mark it on the tire, or it's rubbed off.

 

Just my two cents:

If the tire says "max 80 psi", and you run 80 psi, not only are you in danger of having a blowout, but your tires will also wear unevenly. They will be bulging in the middle, causing that to wear faster than the edges.

Air heats up (expands) and cools (contracts) like everything else. If you fill the tire to 80 psi cold or semi-cold, it will expand past that on a decent trip after it heats up.

A lot of guys here do it to get that extra MPG or two, but I think its a bad idea. Paying a few dollars more for gas or paying hundreds for new tires. Up to you.

 

The recommended PSI for your truck should be on the inside of the door frame, drivers side. It is around 30-32 psi I recall. I run my 35" tires at 35 psi per recommendation from Toyo. When I tow, I up that to about 48-50 PSI, still not as high as the max PSI on the sidewall of the tire.

People often think that they should run the PSI that is written on the side wall of the tire, but that is the max PSI of the tire, not the recommended PSI. Some people will also increase the PSI to improve gas mileage. Higher PSI causes the tire to buldge in the center of the tread. If the truck is not loaded down, this means that less tire is in contact with the road (only the center part of the tire), which helps with rolling resistance and can improve gas mileage. The cost though comes in the form of increased tire wear in the center of the tire, plus a rougher ride and greater potential for tire failure. Personally, I'd rather buy a little more gas then have to replace my tires more often.

 

If you fill to max psi and don't load the truck, they are over inflated, will wear bad and be hard as rocks. It depends on the tire, wheel size and load in the truck. I run my 35s at 28psi. You should be able to see the road contact on the tread and adjust from there.

 

ok, thanks for all the info. I'll continue with my 34-36 psi for now, as it seems to be good, but I may try 30-32 and see if that helps any. I do have a fairly rough ride, but I think the shocks have most to do with it.

 

You could do the chalk test to get the perfect PSI.

 

I run my tires at 80psi. but do not wear unevenly now. The only reason they did wore uneven, was the ones in the front and because lack of upkeep from the previous owner. Swap the rears to the front and vice versa. Rolls a heck of a lot straighter now (doesnt pull) and... yea. But when you look at the tread, tread is equal all the way across. she would pass the chalk test with flying colors.

 

I thought 80psi was for the E load tires, or was that the 3rd gen tires, I can't remember.

 

The psi you run in your tires depends on the ply size of the tire. Examples:

P metric tire (Example: P265/75R16 instead of LT) - 32-35psi - *Should not be towing with this type of tire!!!

C load - 6 ply = 32-35psi

D load - 8 ply = 35-50psi (Depending on towing weight)

E load - 10 ply = 40-80psi (Again, depending on how much weight you plan on pulling on a daily basis)


I sold tires for 6 yrs

 

My tires are E rated, and Toyo recommended 30-35 psi for daily use, and more depending on the load weight. They are wearing perfectly so far.