Tire Pressure

What does it indicate then?

 

The amount of pressure in your tire, according to the gas laws.

 

That's right. every shop manager I ever spoke to regarding inflation pressures tells me the pressures and I do it HIS way.

 

Helium is a very small molecule and can actually leak through rubber. I know this cause I'm also a certified welder. If you're being serious about this you should try nitrogen.

 

Keith didn't say you're overinflated. What I said was its likely you are and to check the load inflation tables.

You're also misreading the tables. 22k lbs on a single drive axle isn't legal. Max loading for a single axle is 17k lbs in a standard tandem/duel configuration. Michelin tables show between 70 and 95 psi cold for 17k lbs depending on which tire you have.

For the record, I don't run my tires as low as the tables call for either. My drives are 90psi and I randomly check pressures on hot days. Highest hot pressure I've seen is 105ish.

 

Oh yeah, according to the sidewall, it gives a weight and pressure, so, therefore, duh. Max pressure for max weight, as per, in accordance with, duh.

What's next? Let's talk about how the dipstick gives no indication of oil required, and refer to tables...

 

I'm not surprised that the average trucker is confused about the properties of gas and how it effects your readings to the point that judging the situation strictly by what the gauge says only hurts you.

 

I've never blown a tire, so it hasn't hurt me or anyone around me to follow manufacturer recommendations on the tire (as if they didn't understand that). I'm not confused, and you can't confuse me.

 

Boss says 100 psi in all tires but I keep the steers at 110 since I tend to have the steer axle on the heavy side. That way states like Missouri who go by tire load rating can't turn around and say I'm OOS due to "overloading the steer axle tires", something they like to do.

 

If you look at the Michelin tire inflation chart a 24.5 can be run at 70psi with a max load rating of 9,640 per tire. That translates to 38,560 per tandem axle. I ran my last set of steers and drives at 90psi and was a very smooth ride.

http://www.michelintruck.com/refere...s-and-warranties/load-and-inflation-tables/#/