Benefits of Nitrogen in Tires

Compressed nitrogen has long been used to inflate the tires of race cars and aircraft. Regular air is approximately 78 percent nitrogen, 21 percent oxygen and 1 percent water vapor. The oxygen and water vapor can degrade tires and wheels, shortening tire life. Nitrogen inflation is now available from many commercial and passenger car tire dealers.
Slower N2 tyre Inflation Pressure Loss
A tire inflated with regular compressed air will lose about one and a half to two psi of pressure per month. Most of the pressure loss is due to oxygen molecules permeating through the tire rubber. Replacing the air with 95 to 98 percent nitrogen reduces the pressure loss to less than one-half psi per month. Since many drivers do not regularly check their air pressure, nitrogen inflation will allow their tires to maintain proper inflation levels longer. The major benefit of properly inflated tires is optimum fuel economy.
Oxygen can cause oxidation of tire rubber and corrosion of metal and alloy wheels. The water vapor in air can accelerate these processes, especially under pressure like the compressed air in a tire. The corrosive effects of both oxygen and water vapor are multiplied when a tire overheats due to under-inflation. Nitrogen is an inert gas and will not cause corrosion or rust. Nitrogen also will not degrade the seals in air valves, further preventing pressure loss.
Using nitrogen to pressurize tires has benefits over regular air for tire longevity. The greatest threats to tire life are heat and uneven tread wear. Both of these result from improper tire pressure; using nitrogen will maintain a more even tire pressure over the life of a tire. Also, the rubber inner lining of a tire will degrade over time in an air environment. As the rubber lining degrades, air pressure will be lost faster, accelerating the effects of under-pressurization. Nitrogen will not cause the inner lining of a tire to degrade, extending its useful life. According to the Innovative Balancing website, inflating tires with nitrogen can extend tire life up to 25 percent. (See References 1)
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