Originally Posted by m3dragon
Nitrogen molecule are denser than Air molecules (AKA larger) thus your tires will keep pressure longer. Most performance cars run nitrogen to keep temps down and well as keep tire pressure. When you drive around corners in any car the, the tire deflects and forms small gaps where air slowly leaks. With nitrogen it is a larger molecule, thus they can't escape.
It is better so if you can get do it. =)
So denser means larger now? Where do some of you guys get your facts? What's more dense - a beach ball or a 1 oz. fishing weight?
Nitrogen expands less with heat, and contracts less with cold.
Nascar uses NITROGEN because it's more of an inert gas than Oxygen and thus expands and contracts much less than regular air when the ambient temperture changes. Thus (in Nascar's case) the tire's pressure fluctuates less and their car setup changes less during a run. Small pressure changes can affect the handling of a racecar.
In our case (the consumer) increased pressure adversely affects the tire's shape when it gets hot and increases uneven wear patterns on the tire tread.