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Taken from the Automobile associations (AA) website

Car Tyres
Filling with nitrogen

The air we breath (and the normal compressed air used to inflate tyres) contains 78% Nitrogen, 21% Oxygen and 1% other gases.

Purified nitrogen has been used to inflate tyres on aircraft and racing cars for many years, but now some tyre specialists are offering nitrogen inflation for ordinary car and van tyres.

The advantages of using nitrogen in specialist applications are clear

Planes fly at heights where temperatures may be as low as -40C. Any moisture in the tyres can freeze causing vibration and balance problems when landing. Pure nitrogen is dry so eliminates this problem (as would using dried compressed air)
In motor sport the smallest fraction of a second can make the difference between winning and losing. Filling with nitrogen can reduce tyre pressure variation caused by changes in tyre temperature.
For passenger car applications the main claims seem to be

Reduced corrosion – because unlike air there's no moisture in pure nitrogen
Slower rate of pressure loss – because nitrogen molecules are larger than oxygen molecules (which make up 21% of compressed air)
Leakage can occur through the tyre's inner liner but can also occur through the valve, punctures, or failure of the seal between tyre and wheel rim. Pure nitrogen might leak more slowly through the liner, but regular checks of tyre condition and pressures will still be essential.

Corrosion of the tyre through use of normal compressed air alone is most unlikely because only the outer tread band of a car tyre contains steel – the amount of moisture reaching it from the inside is minimal.

Changing to nitrogen involves removing all the air which is already in the tyres and then re-inflating them with purified compressed nitrogen. There will be a one-off charge per tyre but once filled with nitrogen any future top-ups would also have to be with nitrogen if any advantages are to be maintained.

Overall, while accepting the possibility of purified nitrogen being of benefit in certain applications, we don't think that the cost and possible inconvenience are justified for normal passenger car use.
 

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I had nitrogen in my tyres when I first got the car. Didn't seem to lose any air for quite a while.

As there was no other facility local to me offering the same service, I went back to the normal stuff.
 

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I knew someone that worked at a shop that had the Nitrogen. He told me not to get it, and said that its advantages were not worth the money.

Chris
 

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I believe the local Kwik-fit offers it for 5 euros per tire. It's not that much, but hey, normal air is cheaper! I check my tires regularly so that's no problem.
 

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What you state makes sense but I believe the nitrogen is introduced to a pressure neutral tire and then causes it to expand to appropriate pressures mixed with some residual air.

I would think, therefore, that the nitrogen occupies at least 90% by volume.

It's only a guess on may part, however.
 

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I believe the local Kwik-fit offers it for 5 euros per tire. It's not that much, but hey, normal air is cheaper! I check my tires regularly so that's no problem.
5 euros per tyre is a pure rip off. I get mine for free at the local tire service, and it seems that I need to do it once a year. In contrast I used to fill them with air 3 times a year.
 

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Nitrogen is completely inert and a bit boring, why not make it fun and fill your tires with helium:grin: It would help you to avoid any traffic jams. Plus you would have the added benefit of being able to suck it out of the tires and could amuse your friends by talking to them in a high pitched voice.
A word of warning, don't use hydrogen - remember the Hindenberg (not sure about the spelling)
 

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Nitrogen is completely inert and a bit boring, why not make it fun and fill your tires with helium:grin: It would help you to avoid any traffic jams. Plus you would have the added benefit of being able to suck it out of the tires and could amuse your friends by talking to them in a high pitched voice.
A word of warning, don't use hydrogen - remember the Hindenberg (not sure about the spelling)
Haha, every Ferrari owner on this site should use helium so at the meets you could sing the lollipop gal song from The Wizard of Oz.

Chris
 

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Does anyoen use nitrogen in their tires ?

If so how often do you need to top it off and how do you do it?

Do the benefits outway the hassle?
Boxer,

I understand they use it as standard in the GTR, ensuring constant pressures even with extreme usage. I would summise that this would be beneficial on your 360CS on the track, and even on a long run through the passes aka FL2, but day to day driving on standard roads wouldn't make a great difference.

Saying that, the pressure sensors on the 612 tell me that pressure increases by at least 2-4 psi from cold start to end of a drive, which I would expect to be as a result of heat generated by the tyres.

I check pressures weekly, especially at this time of year. Average temp in the summer is 28'C, now between 8-14'C and that causes a drop of 2psi of both front and rear tyres.

Quote:
Originally Posted by Gcalo
They sure blew away the competition, though!!!

Guys, if we don't stop gassing and get back to the thread, Boxer will blow his top, we will be seen as being antagasnistic, .I know you see it as having a blast, but this could explode (hindleberg ref) in our faces.
 

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Discussion Starter #18
Boxer,

I understand they use it as standard in the GTR, ensuring constant pressures even with extreme usage. I would summise that this would be beneficial on your 360CS on the track, and even on a long run through the passes aka FL2, but day to day driving on standard roads wouldn't make a great difference.

Saying that, the pressure sensors on the 612 tell me that pressure increases by at least 2-4 psi from cold start to end of a drive, which I would expect to be as a result of heat generated by the tyres.

I check pressures weekly, especially at this time of year. Average temp in the summer is 28'C, now between 8-14'C and that causes a drop of 2psi of both front and rear tyres.
.
Agree, it makes sense for a race/track car but probably not worth the hassle on a road car unless you are planning on doing some very aggressive driving (autobahn, alps, or track).

Any idea if it extends or cuts the useful life of the tires ?
 

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Agree, it makes sense for a race/track car but probably not worth the hassle on a road car unless you are planning on doing some very aggressive driving (autobahn, alps, or track).

Any idea if it extends or cuts the useful life of the tires ?
From what I have heard the Nitrogen extends the life of the tire, because there is no condensation on the inside of the tire.

Chris
 

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it would make sense that if the pressures are more constant, wear rate on the tread would be more even, and thus less prone to specific outer edge, inner edge wear. However, if tracking or camber settings were incorrect, would this not then accelerate wear of the tread?
 
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