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Old 03-16-2007, 09:13 AM   #5
Tool Pants
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Join Date: May 2002
Location: San Jose
Posts: 1,889
Air is about 80% nitrogen. The oxygen molecules in air are smaller than the nitrogen molecules, so the oxygen escapes from the tire faster.

So if you fill your tires 120% the oxygen molecules will escape and you are left with 100% nitrogen.

Free nitrogen for your tires....
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