When I saw that 8 replies were already posted, I was sure that someone had
provided a serious response; but it was not bo be.

I have long forgotten the periodic table, so I used Wiki. Argon is shown
as
atomic number 18, so it is a good sized molecule--although possibly
smaller
than N2--and is supposedly used when Nitrogen is not sufficiently inert.

It seems like it should work just fine, even if mixed later with dry
nitrogen or even with air; but I would call the tire manufacturer and ask.


Better get in touch with Ingersoll-Rand and NASCAR. Apparently you know
something they don't.


Nitrogen runs cooler thus less thermal expansion, and is more predictable
due to less moisture content. But don't take my word for it.

Ingersol-Rand

consistent tire pressure

cooler running tires

Longer tire life

Better fuel mileage

Increased safety

Eliminates false alarms for Tire Sensor-equipped vehicles.

http://www.nitrogendirect.com/?gclid...FRf9IgodRyLXvg



How Stuff Works

Why don’t they use normal air in race car tires?

http://auto.howstuffworks.com/question594.htm



How Stuff Works

How NASCAR Race Cars Work

http://auto.howstuffworks.com/nascar5.htm