Is It OK To Deflate A Hot Drive Tire On My Truck?

Running lower tire pressure also reduces fuel economy. I personally wouldn't run less than 105psi on any tire, regardless of load weight.

 

Years ago I remember reading a article about a company running lower pressure as per tire manufacturer but getting placed oos at scales a few times because it was under 80 psi.. can’t remember if they won in court or not

 

One thing you need to consider is the “heat on the street” factor In the summer months. Heat is what kills tires. Lower psi makes more heat. If you set a tire at its 105 max at ambient it will actually stay cooler on a hot day of normal running then if set at s lower psi. Sidewall flex is the reason. That creates heat and stress on the tire. The steel cords in the sidewall fatigue snd will break. Blowouts and gators all over the roads in the summer time proof low psi kills. That is why many tire shops will not air up a hot tire that has been run low on air. The sidewall can “zipper” and blow out.
Another trick to do that the big three manufacturers all say is safe is too run 5psi over the labeled sidewall psi if running
75 mph or over for long periods of time. Speed builds heat. Heat kills the tires. Lower psi builds much much more heat then higher psi.

 

The court case that was written about, the carrier lost.

That said, stop overthinking this.

The manufacturers put in hundreds of hours of testing, burn through hundreds of tires and uses the data to come up with those charts.

Now the thing is, inflation the tires so they ride right. What I mean by riding right is not the feel but the full contact of the tire on the surface of the road. The manufacturers use a method called Chalking; it is where you use chalk to find the contact locations of the tire on specific road surfaces at different pressures. What this actually tells you is the best tire pressure for the least rolling resistance with maximum contact.

As a fleet, we do (with exceptions) 110psi all around; this is the best for the fleet. The exceptions are the super singles, which run at 130 psi, and heavy haul, which is load-dependent.

Changing air pressure to fit specific needs is not needed for road trucks, it is not even needed for most 4X4 situations.

 

As a company driver, are you logging this tire PSI conundrum On Duty?

I really don't understand your concern here. But, whatever I guess.