TC John
Chihcago
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I just put some new Load range E's on my Dually...For years I know race cars have been using Nitrogen for inflation, however most tire dealers have been using it to fill a new set of tires and of course you can pay for it as well....
In normal higway driving I have noticed my tire pressure jumps up about 4 to 6 pounds when hot from cold and never seems to be real stable.
I am just about to take a long trip and will be interested to see if the cold and hot pressure stay consistant as the installer said it would....
Anybody tried Nitrogen yet..and what were the results...I am in favor of anyting that stabalizes the tire pressure.....
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uScott
SLC, UT
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TC John wrote:I just put some new Load range E's on my Dually...For years I know race cars have been using Nitrogen for inflation, however most tire dealers have been using it to fill a new set of tires and of course you can pay for it as well....
In normal higway driving I have noticed my tire pressure jumps up about 4 to 6 pounds when hot from cold and never seems to be real stable.
I am just about to take a long trip and will be interested to see if the cold and hot pressure stay consistant as the installer said it would....
Anybody tried Nitrogen yet..and what were the results...I am in favor of anyting that stabalizes the tire pressure.....
I've had real good luck using a 78% nitrogen mix, and you can't beat the price. 
Seriously though, we're not racing our TC rigs (and if anyone is, I want video!), and hopefully not running our tires beyond their load ratings. I trust the manufacturers enough to give us recommended inflation pressures that accounts for the pressure variations caused by running at speed under a reasonable load.
As I understand it, the biggest factor in pressure variance is moisture. Nitrogen from a bottle is of course perfectly dry, unlike everyday untreated compressed air. I do wonder whether running air through a dryer, such as auto body painters use, would help any.
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fordsooperdooty
Southern California
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Nitrogen molucules are larger than oxygen molucules, thus they dont "migrate" thru the rubber and leave the inside of the tire, causing tires to stay at proper pressure longer. And keep in mind "lieu of the stuff we breathe"...we actually breath more nitrogen at 78% than oxygen (21%)! 
My posts shouldn't be taken for factual data. They are purely fictional, for entertainment purposes and should not be constituted as actually related to scientific, technical, engineering, legal, spiritual or practical advice. Amen. 
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Ponderosa
Western US
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Doesn't matter what you put in, pressure varies with temp the same (Ideal Gas Law). Water vapor is the same as oxygen is the same as nitrogen is the same as helium. A 10 degree temp change will result in exactly the same increase in pressure regardless of what you fill the tire with.
Exception:
Now, if the gas in your tires contains enough water and it is cold enough the water will condense on the walls of the tire. When you drive the tire heats up, the liquid water changes to gas and your preesure rises more than it would had there been no state change. Does air from your compressor have a lot of water in it and are temps when you fill low enough to condense it? Good question. I think under normal highway conditions it makes not one iota of difference.
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blueflash
East Tawas, Michigan
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More bother than worth and last I heard, was not reccomended by tire makers.
Blueflash
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youngm357
North Idaho
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I tried nitrogen in the tires on my Mercedes and the only thing I noticed was that I was out about $50.
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SoCalDesertRider
SanDiego, CA, USA
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A worthless gimmick. Plenty of free air available, why increase costs in this bad economy?
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W4RLR
Full timing, based in Marion County, Tennessee
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Do you own an aircraft or an RV. Aircraft tires are filled with nitrogen, as they go from zero to 180 miles per hour in about two seconds, and spend time in the upper atmosphere. Oxygen, even 22 percent, is bad mojo.
In land vehicles, it is a waste of good money and another way for the tire shop to increase their profit margin. Save your cash and spend the money on metal valve stems. They make a difference.
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2oldman
Moses Lake
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Been discussed a lot on here:
Nitrogen posts
fordsooperdootydieselsmoker wrote:Nitrogen molucules are larger than oxygen molucules Hmm.. since N exists in a gas in its elemental form, I guess it would be called an atom, not a 'molucule'. Your explanation is a good sales pitch but nonsense.
* This post was
edited 04/05/09 10:21pm by 2oldman *
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Jeff3161
Pasco,Washington
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I just read a report about that and for average passenger car or truck it really makes no difference to use Nitrogen. Stick with the free air and just check the pressure each month.
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