Tire pressure at altitude

Why don’t car tires burst when you go over a 12,000 foot mountain pass?

Because the air pressure at 12,000 feet is only about 5 psi less than the air pressure at sea level. Any tire in decent shape can handle that change.

I’m sure you could take a tire completely into outer space and it wouldn’t burst. It would be like overinflating it by about 14 psi, some people overinflate that much just to get good gas mileage and their tires survive.

Here’s what happens to a plastic water bottle when you drive from Taos NM to Austin TX.