Tire Pressure Vs. Ambient

bluwtr49 wrote:
I recently found that adjusting our tires to the cold inflation temperature base on the local ambient may not be the correct way to do this. Based on this info, the ambient temp for setting tire pressure is always 65F and they are than adjusted upwards base on local ambient.

This was a surprise to me and would suggest that many are running their tires under inflated.

Tire Pressue vs Ambient

Something to consider. Me, I'm going to follow this guide.

I'm not sure why this seems controversial: the science is sound. For example, here's what Roger Marble says on RV Tire Safety: "As you work through my earlier posts you will see the general guideline for pressure increase of about 2 percent for every 10°F, so if you set your cold pressure to 80 psi in Oklahoma City in November and it's 45°F you may see your cold pressure has increased to 86 psi in Phoenix the next morning when it is 85°F." Or running it the other way, if you set your cold pressure at 86 psi at 85°F, the cold pressure would be 80 psi at 45°F. So, the question is, if the cold pressure is right in Phoenix, should you add air when you get to Oklahoma City?

I'll send a message to Marble as to whether one is supposed to chase the pressure/temperature curve all over the place every morning, or just ignore the temperature correction and figure it's close enough for government work. (I've always assumed one can ignore the temperature correction, but you know what they say about "assume...")

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