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[the alarming man]

it is not just shocking fit that uses nitrogen ATS do it as well in a avation application it is used/needed but on cars not really an issue...but what happen when you check your tyre pressure and have to refill it a PITA paying 20p let alone £ 20 a corner!!...i think it more a gimmick than anything else 

[Abiton]

Further more, another question, operating temperature gives an operating pressure because warm tyres have increased pressure due to heat, hence all tyres pressures are quoted cold.

What pressures do Nitrogen suppliers recommend? Because the stock pressures will now be useless as the tyres pressure won't increase correctly because the pressure won't increase with the tyre temperature if Nitrogen is used.

Get that wrong and the tyre could be permanently under inflated... No?

This is nonsense I'm afraid Chris.

Which bit...? That Nitrogen won't expand with heat?
If so there's no point using it, fair enough.

However there is a part of that equation I believe to be useful. Rightly or wrongly. 

Sorry, should have been clearer, nitrogen will expand with heat just like any other gas.  Just because some marketing type at Kwik Fit claims it's exempt from the laws of physics does not make it so. 

[Andy H]

Further more, another question, operating temperature gives an operating pressure because warm tyres have increased pressure due to heat, hence all tyres pressures are quoted cold.

What pressures do Nitrogen suppliers recommend? Because the stock pressures will now be useless as the tyres pressure won't increase correctly because the pressure won't increase with the tyre temperature if Nitrogen is used.

Get that wrong and the tyre could be permanently under inflated... No?

This is nonsense I'm afraid Chris.

Which bit...? That Nitrogen won't expand with heat?

If so there's no point using it, fair enough.

However there is a part of that equation I believe to be useful. Rightly or wrongly. 

Exactly - nitrogen expands with increase in temperature just like any other gas. Charles Law If it can't expand then the pressure increases. Boyles Law

The only way it could be beneficial is if the water vapour makes the pressure increase more pronounced Dalton's Law. If I can find some figures for the water content of compressed air I might be able to work out some answers using the Gas Laws.

I wonder how hot a tyre gets in use?

[Amigo]

I was going to ask about this. My new (06 plate) TGA MAN truck has stickers on the body above the front wheels saying nitrogen filled. I asked a tyre fitter & he was'nt sure but said fitters have to be re trained & carry said gas to re inflate but added my truck tyres are probably air filled by now as it's an expensive impractical gimmick which sounds righrt to me. If a Kingsway tyre fitter has no experience of them since 06 then it obviously has caught on for everyday use so on that premis i guess there is nothing to be gained by using it in an everyday car regardless of techie discussions.

   I did hear Clarkson say a new sporty Datsun he was testing had them so maybe it's only for planes or hihg pperformance cars. Everyday cars & trucks like ours, probably not.

[tidla]

put helium in my tyres and it just floats along now...

[Amigo]

put helium in my tyres and it just floats along now...

[Andy B]

If you buy a tyre from Costco it'll be Nitrogen filled. If you need it topping up just take it back to them & they'll re-fill  for nothing. 

[Amigo]

If you buy a tyre from Costco it'll be Nitrogen filled. If you need it topping up just take it back to them & they'll re-fill  for nothing. 

Hello matey. Still not much help if you notice it's a tad low when not at a Costco.
  Sorry, i'll stick with air!

[Field Marshal Dr. Opti]

Placebo?

[Andy B]

If you buy a tyre from Costco it'll be Nitrogen filled. If you need it topping up just take it back to them & they'll re-fill  for nothing. 

Hello matey. Still not much help if you notice it's a tad low when not at a Costco.
  Sorry, i'll stick with air!

So do I. 

[robbo299]

They fill tyres with Nitrogen at WIM. Aparently one reason is less water vapour in tyre compared to the run of the mill air inflation units on garage forecourts.

[twiglet]

I was going to ask about this. My new (06 plate) TGA MAN truck has stickers on the body above the front wheels saying nitrogen filled. I asked a tyre fitter & he was'nt sure but said fitters have to be re trained & carry said gas to re inflate but added my truck tyres are probably air filled by now as it's an expensive impractical gimmick which sounds righrt to me. If a Kingsway tyre fitter has no experience of them since 06 then it obviously has caught on for everyday use so on that premis i guess there is nothing to be gained by using it in an everyday car regardless of techie discussions.

   I did hear Clarkson say a new sporty Datsun he was testing had them so maybe it's only for planes or hihg pperformance cars. Everyday cars & trucks like ours, probably not.

Correct... The Nissan Skyline has had nitrogen in its tyres from the factory for a good few years now. Nissan made quite a fuss about! However, they also said that each gearbox is specifically built to work with a certain engine, as all the engines are hand built and are slightly different. They also say that horse power figures can differ between engines!! Sounds like a load of bull to me!  What happens when you need a new gearbox?  :-/

[Kevin Wood]

Correct... The Nissan Skyline has had nitrogen in its tyres from the factory for a good few years now. Nissan made quite a fuss about! However, they also said that each gearbox is specifically built to work with a certain engine, as all the engines are hand built and are slightly different. They also say that horse power figures can differ between engines!! Sounds like a load of bull to me!  What happens when you need a new gearbox?  :-/

Another way to read that is that their production tolerances are so sh1t that they have to fettle every gearbox before it'll fit the engine.

.. or that it's some load of old bull created by a marketing consultant somewhere.

[Mr Skrunts]

So, if I want nitrogen filled tyres what would it cost?

[Mikes1670]

What is meant by 'snake oil for road use?' :-/