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Tires are most often filled with compressed air, which is the same air that we breathe. Air is made up of about 78% Nitrogen and 21% Oxygen. Tires are also sometimes filled with pure Nitrogen in order to get better gas mileage and tire life. This is possible because pure Nitrogen does not expand and contract with temperature changes as much as air does. So if you fill your tires with air when it is cold, the air will expand when it heats up and increase your tire pressure, which makes them less efficient and wear quicker. Inflating tires with pure Nitrogen helps to minimize this inefficiency and offset its negative results.

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15y ago

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