I'm skeptical too, but here's one thing you missed:
The commercials I've heard on the radio for this say that they actually
suck the air out of the tires and replace it with N2.
So, they could push the tire onto the rim, pop it with air if they
wanted to, then suck (most of) the air out if it and refill it with N2.
Depending on how much vacuum they can put on the tire without the bead
unsealing, it seems like it could get decently close to pure N2.
I'm skeptical that it actually helps anything. Especially
cost/benefit-wise.
Regards,
Jon Heese
av8r567@optonline.net wrote:
> I know we talked about this on the list a while back.
>
>
> http://news.yahoo.com/s/ap/20060731/ap_on_bi_ge/nitrogen_tires
>
> "Skeptics will question how much can be gained by filling tires with pure
>nitrogen when the air we breathe is 78 percent nitrogen."
>
>
> Being a skeptic (and an engineer) I will and do question this. Correct me if
>I'm wrong, but when a tire is mounted on a rim, doesn't "regular air" get
>trapped inside???? Even if pure Nitrogen is used to "pop" the tire bead onto
>the rim there's still "regular air" inside that will be mixed with the
>Nitrogen. Soooo, you don't end up with a tire filled with 100% Nitrogen. The
>only way to ensure 100% Nitrogen inside the tire is if the tire mounting
>machine were inside a sealed room filled with Nitrogen and the installer had
>to wear an Oxygen mask. Is that what the tire dealer purchases for $3,000 to
>$12,000 dollars? What am I missing here?
>
> What if it's Sunday night and my tire(s) are a few psi low? If the local Gas
>'n Sip doesn't have Nitrogen, then what good is having Nitrogen in my tires?
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