Originally Posted by Machka
Wouldn't your example be a difference of 20 psi?
However, I only inflate my tires to somewhere between 90 and 100 psi at the best of times anyway.
The general rule is atmospheric pressure decreases by half for each 18,000-foot increase in altitude. So at 36,000 feet, the tire that was once at 110 psi at sea level could be high enough to blow it off the rim or pop a tube. Thats the Airline's concern.