Frank,

That's bogus! It's a marketing ploy by Costco.

Gases - nitrogen or otherwise - all follow the "Ideal Gas Law". This law
- oft stated in chemistry and physics - is comprised of three other laws
- Boyles Law, Charles Law, and Gay-Lussac's Law.  A fairly comprehensive
and easy to read summary of these laws is found in Wikipaedia. The
inside volume of the tire remains constant, so as temperature changes,
whether from the weather or from rolling friction on the road, the
pressure will change. The case for nitrogen being used in the Agilis
tire is that it is a very dry gas - no entrained moisture - and being a
relatively inert gas, it reduces the tendency of the tire to rot.

BTW, I'm soon to need new tires, and the Agilis is my choice for the
next set.

Regards,

John Rodgers
88 GL Driver

Frank Condelli wrote:
> In a message dated 20/09/2007 6:15:56 A.M. Eastern Standard Time,
> WHalsey@sya.org writes:
>
> Why  nitrogen? I have never heard of that.
>
>
>
> Because that's what COSTCO is doing.  The  pamphlet I got from COSTCO says:
> Nitrogen helps stabilize a tire's  inflation pressure.
>
> Cheers,
>
> Frank  Condelli
> Almonte, Ontario, Canada
> '87 Westy & Lionel Trains (_Collection for sale_
> (http://members.aol.com/Fkc43/trainsal.htm) )
> _Frank Condelli &  Associates_ (http://members.aol.com/Fkc43/busindex.html)
> - Vanagon/Vanagon Westfalia Service in the Ottawa Valley
> _Vanagon Stainless Steel Exhaust  Systems_
> (http://members.aol.com/Fkc43/stebro.htm)
> _BusFusion_ (http://members.aol.com/BusFusion/bfhome.htm)  a VW Camper
> camping event, Almonte, ON, June 07 ~ 10,  2007
>
>
>