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[–] 6 points 9 months ago (1 child)

That's the opposite of how that works.

Tires are a gauge pressure, meaning pressure vs ambient pressure.

14.7 psia (absolute) at sea level. And getting less as you go higher elevation.

12.7psia ambient is ~4000ft elevation 10.7psia ambient is ~8500ft elevation

So if it you start at sea level with 40psig in your tires, when you get to 8500ft elevation and measure the tires you'll be ~44psig.

If you start at 8500ft at 40psig, when you get to sea level they'll be ~36psig.

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