Tire pressure variance on duallies

Look at the KTI 89001 Digital Tire Inflator on Amazon. I've had mine for a couple of years. It is easy to use and appears to be fairly accurate. It does match up with pretty well with the monitors in my Ford and the wife's Acadia.

Tvov wrote:
Why would you allow tires on duallys to have different pressures?

There may be a varying of pressures as you drive throughout the day, the tires are designed to handle this.

Seems like you answered your own question.
Once rolling, it is not something that you "allow".

ACZL wrote:
How much difference do you allow?

It is not something that you really have any control over.

You set them properly COLD and then don't worry (too much) about what they do as they heat up. I have seen differences approaching 10 PSI but that is just going by the TPMS and the accuracy on mine varies all over the place.

Trying to find out WHY would be long and expensive.....and generally pointless. The difference is mostly created by a slight difference in the wheel and maybe air flow. If one side is constantly in the sun, that makes the outside tire hotter too.

My take: Don't worry about it. The TPMS is there mostly to notify you of air loss.

Tvov wrote:

Each of my vehicles has its own tire pressure gauge in the glove compartment. When I get a new tire pressure gauge, I compare its' pressure readings with other gauges such as on a service stations air line. As long as it is close, I go with it. Tires are designed to function with a few pounds pressure differences.

So you accept the fact that you might want 60 psi but really are getting 55 or 65? It doesn't matter what a gas station's gauge says because you are comparing it to an unknown standard and I would think we can do better than that. Does anyone have a good idea about a good brand that really reads correctly?

Why would you allow tires on duallys to have different pressures? They should be the same. When I fill tires, they are all the same pressure (sometimes front and back axle tires are different depending on the setup and owner's manual).

Check and fill them in the morning, when the temperature is cooler. There may be a varying of pressures as you drive throughout the day, the tires are designed to handle this.

Each of my vehicles has its own tire pressure gauge in the glove compartment. When I get a new tire pressure gauge, I compare its' pressure readings with other gauges such as on a service stations air line. As long as it is close, I go with it. Tires are designed to function with a few pounds pressure differences.

Actually, ACZL, now that I think of it... are you talking about pressure differences during a trip? Tire pressure are going to vary with the heat of the day and miles driven.

Better question is what tire gauge really reads correctly to begin with? I have 3-4 and all read differently. I wish I could get one that I knew was accurate.

Equal side to side +/- 1 cold.

As I am the one holding the air hose zero tolerance is my starting point.
It all goes to heck the minute you start rolling with sun on one side, shade on the other, heat buildup, and a side to side weight difference.
The sensors are another issue as 2 of the same ones can vary slightly.
Don't overthink it, it will drive you crazy.