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The latest idea for keeping your tires from slowly going flat (air molecules do leak through rubber tires) is to use nitrogen. It's a larger molecule than oxygen, and doesn't leak out as fast as air which is about 80 percent oxygen.

Glenn



Glenn, you are correct about using nitrogen in tires. However I do believe that air is approximately 21% oxygen. I believe you made a typo as air contains approximately 78% nitrogen. Argon makes up the difference to 100%



Mario:

You are absolutely correct - I got the numbers backwards.

So, I'm wondering; if air is only 21% O and 78% N, then how much improvement would there be with pure nitrogen? And would it be cost effective. Most places I go, air is free, but nitrogen would not be, and if you weren't close to a nitrogen filling station, what would you do - dilute the nitrogen, then have to start over again? Cost effective - or a money grab by tire shops?

I have a modest RV, and I carry an air compressor because the tires take 65 psi, and if I develop a slow leak, I'm not stranded.

Glenn