This would be very difficult for me to explain. "Standard" barometric pressure change from sea level to 8,000 feet would be in the neighborhood of 3.7 PSI. If one were to take a tire that is inflated to 40 PSI at sea level to 8,000 feet, with only the normal lapse rate of approx. 3.5 degrees F./1,000 ft., the tire guage pressure should be something slightly less than the 3.7 PSI expected differential due to slight expansion of the tire.
A 12 PSI change in guage pressure from sea level to 8,000 feet would be extraordinary, requiring a a tremendous variation in the expected barometric pressure due to horizontal location change, along with a much larger temperature change than the "standard" lapse rate due to altitude, normally between 3-7Degrees F./1000 feet.
A 12 PSI pressure change between Amarillo and 7,000 feet even more difficult to comprehend, since that is only a 3,600 foot change in altitude. Should be less than a 2 PSI differential!
What am I doing wrong? Anyone have a different evaluation of this?
David Shealey
'01 black LTC "BAT BYKE"
San Diego
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Re: Tire pressure/Altitude change??
[re: jayz9705]
