Yep Errol is correct. I went to one of the racecar dynamics 
seminars with Claude Rouelle (ex head race engineer in 
F1?/CART/IRL etc etc) and he made the point that the use of 
nitrogen in dampers etc was for consistent operation, because 
there is no change in expansion/compression with temp.

Andrew

> I think you will find its more to do with the rate of expansion per degree
> of temp increase. This means your tyres react more predictably with temp
> changes.
> 
> Cheers
> Feral Errol
> [EMAIL PROTECTED]
> http://www.datrats.com.au/
> 
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Jim Little
> Sent: Sunday, 23 June 2002 6:59 PM
> To: [EMAIL PROTECTED]
> Subject: Re: nitrogen filled tires
> 
>  and aircraft
> 
> --- mark krawczuk <[EMAIL PROTECTED]> wrote: > i
> believe that  some racing  pushbikes use nitrogen
> > in the tyres?
> >
> >   mark k
> > ----- Original Message -----
> > From: "James Cox" <[EMAIL PROTECTED]>
> > To: <[EMAIL PROTECTED]>
> > Sent: Saturday, June 22, 2002 1:32 PM
> > Subject: RE: nitrogen filled tires
> >
> >
> > > Actually I think they do that to maintain a
> > constant tyre pressure since
> > > nitrogen is less likely to expand with heat
> > increases, a common practice
> > in
> > > some forms of motorsport.  If he really intended
> > to make the tires lighter
> > > he should have uses helium.
> > >
> > > Jame Cox
> > >
> > >
> > > >
> > > >No
> > > >I have only ever seen a bloke fill his tyres with
> > nitrogen to make them
> > > >lighter, similar to bridge construction (true
> > story)
> > > >
> > >
> > >
> > >
> >
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