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PartyOf Five

Wheaton, IL

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Posted: 04/07/21 08:46pm Link  |  Quote  |  Print  |  Notify Moderator

Our mechanic suggested nitrogen in the car tires if we did a rotation as winter approached. Apparentky it doesn't contract and expand as much in the cold and so is better in extreme temps.
That was already a few years ago- the fad seems to have died down.


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time2roll

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Posted: 04/07/21 09:07pm Link  |  Quote  |  Print  |  Notify Moderator

Put "nitrogen" in that search box above, I dare you [emoticon]


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DrewE

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Posted: 04/07/21 09:22pm Link  |  Quote  |  Print  |  Notify Moderator

PartyOf Five wrote:

Our mechanic suggested nitrogen in the car tires if we did a rotation as winter approached. Apparentky it doesn't contract and expand as much in the cold and so is better in extreme temps.
That was already a few years ago- the fad seems to have died down.


The only component of air that expands or contracts significantly differently than nitrogen alone is water vapor. Dry air won't behave much differently at all than pure nitrogen (and air is mostly nitrogen anyhow)--all the component gasses are very well well described by the ideal gas law.

Some gasses do interact with rubber a little differently; in particular, carbon dioxide more easily permeates through the rubber itself than most other gasses, though it's not a huge difference and completely irrelevant if your tire isn't perfectly sealed to the rim, or the valve stem leaks microscopically, etc.

In some extreme applications, like airliners and race cars, nitrogen is used to reduce fire risks. For ordinary vehicles and trailers, it's pretty much valueless (but not harmful or worrisome in any way).





pianotuna

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Posted: 04/07/21 09:58pm Link  |  Quote  |  Print  |  Notify Moderator

Hi Crowe,

First there are no stupid questions.

Some aircraft have nitrogen installed in their tires. Once you have taught your RV to fly--I do recommend nitrogen. Until then, compressed air will be fine.


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ktmrfs

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Posted: 04/07/21 10:03pm Link  |  Quote  |  Print  |  Notify Moderator

PartyOf Five wrote:

Our mechanic suggested nitrogen in the car tires if we did a rotation as winter approached. Apparentky it doesn't contract and expand as much in the cold and so is better in extreme temps.
That was already a few years ago- the fad seems to have died down.


NOT true. all gases follow boyles law PV=RT. since V (volume) is constant, P is strictly a function of T (temperature) where T is absolute temp, E.G. room temp is 273 or so Kelvin

Nitrogen molecules are slightly larger than Oxygen, so pressure drop from migration through the tire will be very slightly less.


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bikendan

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Posted: 04/07/21 10:10pm Link  |  Quote  |  Print  |  Notify Moderator

Crowe wrote:

So y'all can call me uneducated, stupid or whatever you like, but the 5th wheel we are looking at comes with nitrogen in the tires. Are there nitrogen pumps available? Can you mix it with air or just swap it over? Just seem weird to me.


This is the biggest scam in the tire industry.


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wa8yxm

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Posted: 04/08/21 04:18am Link  |  Quote  |  Print  |  Notify Moderator

Crowe wrote:

So y'all can call me uneducated, stupid or whatever you like, but the 5th wheel we are looking at comes with nitrogen in the tires. Are there nitrogen pumps available? Can you mix it with air or just swap it over? Just seem weird to me.


First the only STUPID question is the one you should have asked, but did not.

Second. Nitrogen There has been much debate on this. Nitrogen has some different properties than basic air. It's a large molecule so the gas does not "Migrate" as fast as normal air (Which is 78% nitrogen by the way) now if there is a greater pressure differential (IE: flying high say 10,000 feet) this becomes more important... It also is not as affected by temperature So it is commonly used in aircraft tires.. Which suffer extreme temps and often can be found thousands of feet in the air.

For RV tires.. It's basically a Gimmick. Feel free to use normal Air.

I do suggest a Tire Pressure Monitoring System...


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dodge guy

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Posted: 04/08/21 05:40am Link  |  Quote  |  Print  |  Notify Moderator

Nitrogen does work. It will keep the pressure stable. But the use in auto/RV applications is not necessary. They have their place, which is in aviation and auto racing.

And yes, you can add regular compressed air to nitrogen filled tires. It’s like adding 87 octane to a tank that has 93.


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CapriRacer

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Posted: 04/08/21 05:59am Link  |  Quote  |  Print  |  Notify Moderator

ktmrfs wrote:

...... All gases follow boyles law PV=RT. since V (volume) is constant, P is strictly a function of T (temperature) where T is absolute temp, E.G. room temp is 273 or so Kelvin. .....


X2!!

Nitrogen behaves exactly like air when it comes to pressure buildup in tires!


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pitch

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Posted: 04/08/21 06:05am Link  |  Quote  |  Print  |  Notify Moderator

JIMNLIN wrote:

I see several haulers swear by using nitrogen in the commercial trucks and trailers. Same size trucks and trailers we rv with.

If I went back to hauling I would use nitrogen all around but for just using a truck for pulling my rv trailer regular compressed air works fine.

Your choice.


You see several haulers that are not real intelligent. Did they purge their tires of existing atmospheric pressure air before the nitrogen? If not they have already eliminated the reason for nitrogen to begin with.

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