-30 temp and tire pressure

adnanakhtar wrote: ↑Good morning, I noticed the -20 temperatures made my winter tires a bit flat. I am guessing the Colder temp shrinks the air inside them?

It’s not air leak as all tires look little under inflated.

Should we be adding more air in the tieres?

Ps: I am in Whitehorse Yukon. Temp drops to -40. Currently it’s -22 with about 4 ft of snow

Thanks in advance

vkizzle wrote: ↑ Correct, tires will lose a few psi in subzero temps.
That's why the recommendation is to take readings when the tires are cold.

Andy34 wrote: ↑ This is where nitrogen is extremely useful. The pressures don't drop anywhere near as much as air even down to -30 or so.

adnanakhtar wrote: ↑ Good morning, I noticed the -20 temperatures made my winter tires a bit flat. I am guessing the Colder temp shrinks the air inside them?

It’s not air leak as all tires look little under inflated.

Should we be adding more air in the tieres?

Ps: I am in Whitehorse Yukon. Temp drops to -40. Currently it’s -22 with about 4 ft of snow

Thanks in advance

warpdwhim wrote: ↑ Air is already 78% nitrogen. The only way you can get all nitrogen is to have 2 valve stems in the rim so you can flush out all the "regular" air.