"John E. Carty" wrote in message ...

"REEI2002" wrote in message
...
Try Nitrogen instead of air, aviation type rubber tubes leak molecular
air.
Nitrogen molecules are larger.

Considering air is 77% Nitrogen, how much difference does this really make
when it comes to seepage of this kind? :-)

And Oxygen, the next largest component (almost 21%) is even larger. Then
you get down to Argon at 1% (which is bigger yet).

Unless you were previously filling your tires with helium, there isn't much to be gained
on diffusion by this change.