Quote:
Originally Posted by spearfish25
Molecular size is also not a factor for tire inflation...tires are not selectively permeable membranes that would leave you with pure nitrogen as the oxygen diffuses out more quickly (very funny idea though). Nitrogen's molecular size is nearly identical to that of oxygen anyway.
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As a tire engineer for many years with Goodyear, I can tell you that nitrogen inflation has only one plus attribute for tire inflation, and that is it won't migrate through the butyl lining of the tire nearly as fast as standard air does. We have run tests and can confirm significant reduction in inflation loss over time. Basically, you won't have to check your car's inflation monthly as you should, but maybe only ever three to four months. Nitrogen inflation won't do any good if leakage is from the valve stem or valve itself, and those items have been cheapened up over time. Hope this helps.