Tire pressure question

[saltbayou]

On my dodge dually drw door placard it says max cold psi 65 on rear. That's what I tow at. However tires are rated 80psi. Should I use 80 or 65? After a recent long trip had a blowout,not while towing.

[Krease]

If you run much over 65 in your rears loaded, you'll wear out the centers. My buddy found that out the hard way. Mine are usually 60-65

[Cummins12V98]

saltbayou wrote:
laknox,good suggestion,it says 80 for single or dually. Now thinking of going 70 all around. Seems like a good compromise. Started this thread because I'm getting ready to order a cat eye air kit. Thanks for all answers.

Those are max pressures for the tires!

Weigh your truck loaded and unloaded and use the charts.

Or do what I have done for thousands of miles and have proven even tread wear.

Run 70 front and you will wear the edges. Run 70 rear you will wear the centers. But if you rotate them at those pressures they will average out but you will bee lucky to get 40K from your tires.

[Cummins12V98]

stripit wrote:
The tire pressure posted in the door of the truck at 65 for the duels will cover the max rear axle carrying capacity listed on that sticker. The tires when filled to the 80 psi will exceed the trucks rear axle carrying capacity, but that will also make the truck ride rough. If you have weighed the truck/trailer and know what the rear axle load is you can easily determine the correct tire pressures needed to safely carry the loads. Find the tire inflation guide on line for your tire and see what it tells you.

Yup!

Like I said it's called CYA on the MFG's part.

I run 45 rear solo and 60 loaded with 4,500# pin weight. As you said use the charts.

I may drop to 40 on the rear since the depth in the center of the rears is 1/32" less than the edges.

I was told by GY Tech to add 5psi when using the charts.

[saltbayou]

laknox,good suggestion,it says 80 for single or dually. Now thinking of going 70 all around. Seems like a good compromise. Started this thread because I'm getting ready to order a cat eye air kit. Thanks for all answers.

[laknox]

saltbayou wrote:
On my dodge dually drw door placard it says max cold psi 65 on rear. That's what I tow at. However tires are rated 80psi. Should I use 80 or 65? After a recent long trip had a blowout,not while towing.

Check the tires, too. Dollars to donuts that there's single/dual application pressures and loads molded right in the sidewall.

Lyle

[FastEagle]

Ever wonder why so many people think the tire manufacturers know all there is to be known about tire pressures?

Tire manufacturers build tires to specifications needed by vehicle manufacturers.

Vehicle manufacturers set recommended tire pressures for all of your vehicles. You know that the recommended air pressures for your tires is set by vehicle manufacturers and is the correct air pressure for your vehicle's tires under normal circumstances, right? Deviations will be found in the vehicle owner's manual.

FastEagle

[stripit]

The tire pressure posted in the door of the truck at 65 for the duels will cover the max rear axle carrying capacity listed on that sticker. The tires when filled to the 80 psi will exceed the trucks rear axle carrying capacity, but that will also make the truck ride rough. If you have weighed the truck/trailer and know what the rear axle load is you can easily determine the correct tire pressures needed to safely carry the loads. Find the tire inflation guide on line for your tire and see what it tells you.

[jmtandem]

45 psi on my duals on my Ram unloaded. Much better ride and good wear. When I carried a 4000 pound cabover camper I went to 80 psi on each and never had an issue. Ride was good. Fronts stay the same loaded or unloaded at around 75 psi. The Cummins is heavy. Has worked just fine for 130,000 miles on the dually. Ran Toyo HT's and got 53,000 miles out of them, now Michelins and hope to get upwards of 70,000 miles.

[Cummins12V98]

saltbayou wrote:
Thanks for advice will continue to use 65. Thanks again

The centers WILL wear pre maturely! It's called CYA with the 65psi number.

[Cummins12V98]

saltbayou wrote:
On my dodge dually drw door placard it says max cold psi 65 on rear. That's what I tow at. However tires are rated 80psi. Should I use 80 or 65? After a recent long trip had a blowout,not while towing.

I run 45 rear solo and 60 loaded with 4,500# pin weight. My tires are wearing very well. I run 80psi front all the time. I just checked at 25K the Michelin MS2's have 9-10/32" tread left.

Too many run too much air in the rears and too little in the fronts. Weigh your rig and use the weight inflation charts. With the HEAVY Cummins up front you will wear the edges off if U don't run 80psi.

[saltbayou]

Thanks for advice will continue to use 65. Thanks again

[iawoody2]

When it states cold pressure it usually means at 70 degrees. The pressure will normally go up based on air temperature not necessarily road temperature. My truck also says 65 rear and tire says 80. I set mine at 80psi and when it's 70 degrees. This afternoon it was 95 degrees and driving at 65mph I checked them at a rest stop and were 90psi and sidewall was 124degrees measured with a infared gun. According to tire manufacturer spec this is all normal.

[Old-Biscuit]

80# is max tire load rating for 'single' application..not dually. Stick to the 65#

[DutchmenSport]

65. Tires will heat up when on the road and tire pressure will increase. Besides, the more pressure in your tires (reaching the tire max), the harder and bumpier will be the ride, and when towing (anything) with very hard tires, it's just simply NO fun at all, unless you enjoy headaches and your back bone yanked out of joint from all the hard bouncing.