The tires were left outside, and, after one year, tire pressure was measured. They filled one tire to 30 psi (pressure in pounds per square inch) with nitrogen and the other to 30 psi with air. To assess the tire pressure performance of air and nitrogen, Consumer Reports tested 31 pairs of different tire models. Nitrogen molecules are larger than air molecules, which means it moves through tires at a slower rate and can offer more consistent air pressure. Over time, this gradually decreases tire inflation. Nitrogen has a slight edge over air, in terms of tire pressure, because it’s less susceptible to temperature changes.Īll tires have microscopic holes that allow small amounts of gas to leak out. Like all gases, air expands when heated and contracts when cooled, and tire pressure will rise or fall accordingly. This combination of gases affects how the air in your tire behaves at different temperatures. The rest of the gas is made of approximately 21 percent oxygen, water vapor, carbon dioxide, and smaller concentrations of miscellaneous noble gases such as neon and argon. Air, the standard gas used to fill car tires, is comprised of 78 percent nitrogen. Therefore, the consistency of your tires’ inflation is vitally important. The primary task of car tires is to carry your vehicle’s weight. If you’re wondering whether nitrogen or plain air is the right choice for you, it’s best to a look at the pros and cons of using either gas. However, there is a lot of controversy surrounding its supposed benefits and whether getting a “nitrogen upgrade” for your tires is a worthwhile investment. While uncontrollable elements such as road conditions and weather can affect the lifespan of your tires, the type of gas you fill them with plays a significant role as well.įor the unaware, nitrogen is often offered as an alternative to air for tire inflation. Managing tires is a key concern for motorists and essential to the overall health of their vehicles.
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