Proper tire inflation
Hello, Can someone chime in on this? The inside of my truck driver door has a sticker that says to inflate the front tires to 55 psi and back tires to 80 psi. That makes sense to me since the we...
Forum Discussion
gitpicker2009 wrote:
...if you want to run the tires at 80psi, you should fill to about 70 or 75 cold....I'd suggest slightly lower, and let them come up to the desired pressure/temp/volume during driving.
While this approach seems logical, it is not the case with tires. The pressure increase due to heating has already been accounted for by tire/wheel manufacturers.
Always set tires to the correct inflation pressure when they are cold. Always!
It's actually Charles law which lays out the relationship of temperature and volume, and it can be stated, simply, that most gasses have a direct relationhip between volume and temp.
IMO, the relationship between tire temperature and pressure is best described by the Ideal Gas Law (PV=nRT), or perhaps Ammonton's Law (P/T=k).
Boyle's Law assumes constant temperature. Charle's Law assumes constant pressure.
