Correct tire pressure

[axis]

Originally Posted by Infern0

Well that doesn't sound good. And the only benefit being air pressure fluctuation is reduced?

Supposedly, it increases the life of the tire since the tire pressure doesn't flucuate as much. I've never heard of the "drying out" affect.

[OUR72GTO]

The Maximum is just that........not the "recommended" as per the builder>

[HeavyD]

So what do you do when your factory set wears out and you replace them with something that is totally different and the recommended tire pressure isn't anywhere near "factory" recommendation? I would go by what the tire says. GM didn't design and test that tire. Do what you want.

[jtallen123]

http://chemistry.about.com/od/chemis...omposition.htm

From there, chemical composition of air.

Question: What Is the Chemical Composition of Air?
Nearly all of the Earth's atmosphere is made up of only five gases: nitrogen, oxygen, water vapor, argon, and carbon dioxide. Several other compounds also are present. Although this CRC table does not list water vapor, air can contain as much as 5% water vapor, more commonly ranging from 1-3%. The 1-5% range places water vapor as the third most common gas (which alters the other percentages accordingly).
Answer: This is composition of air in percent by volume, at sea level at 15°C and 101325 Pa.

Nitrogen -- N2 -- 78.084%

Oxygen -- O2 -- 20.9476%

Argon -- Ar -- 0.934%

Carbon Dioxide -- CO2 -- 0.0314%

Neon -- Ne -- 0.001818%

Methane -- CH4 -- 0.0002%

Helium -- He -- 0.000524%

Krypton -- Kr -- 0.000114%

Hydrogen -- H2 -- 0.00005%

Xenon -- Xe -- 0.0000087%

Ozone -- O3 -- 0.000007%

Nitrogen Dioxide -- NO2 -- 0.000002%

Iodine -- I2 -- 0.000001%

Carbon Monoxide -- CO -- trace

Ammonia -- NH3 -- trace

Reference: CRC Handbook of Chemistry and Physics, edited by David R. Lide, 1997.

Feel free to draw your own conclusions.

I'm not going to say I'm an expert on tires, but I would prefer to see some documented evidence that upping the nitrogen percentage in my tires from 78% to 98%, or thereabouts, will actually do much of anything.

Regardless, check your tire pressures regularly and keep them properly inflated.

[Easy Go]

PV=nRT

[SleepWarz]

Originally Posted by VT2CA

Costco have Nitrogen air pumps, many tire places do not recommend Nitro tho as it drys out the tire from the inside out, can cause premature cracking and deterioration of the rubber in a place where you wont see it happening.

Not like our tires last too long anyways =p

[OUR72GTO]

OR..........

Is that the old Costco bashing and the " SOME TIRE PLACES" can't provide it so they knock it?

[Easy Go]

My personal opinion is that the real benefit (if anything) is keeping moisture out of the tire with regards to temperature and pressure fluctuations due to the water vapor from the compressed ambient air vs. pure nitrogen which would be "drier" and the pressure fluctuations due to water vapor are eliminated. By definition, pure nitrogen would not oxidize the rubber. Sulfur and oxygen react well - sulfur and nitrogen not so much...

[Johnny1]

You never inflate to what it says on the tire for maximum pressure. You most likely will have way to much air in the tires. You want to put just what the door jam says for that size tire on that vehicle. The factory tires on my Canyon 4x4 says max. on them 44lbs. But yet the door jam says 30lbs. If I were to put the maximum I'd wear the center right out of the tires they would be so over inflated. I put what the door jam says and they are wearing even all the way across.

[strobi]

I have a 2LT RS, I traded off the 20 tires and got 2 sets of 18' (LS STEELIES AND BAVARIAN) WHAT PRESSURE SHOULD i BE RUNNING IN THESE??? 36 SEEMS A LITTLE HIGH FOR 18"

[Abygale]

Originally Posted by VT2CA

Costco have Nitrogen air pumps, many tire places do not recommend Nitro tho as it drys out the tire from the inside out, can cause premature cracking and deterioration of the rubber in a place where you wont see it happening.

Well it sure would be nice if you would post something that supports this statement. I have never heard of such a thing, and usually you hear just the opposite that pure nitrogen has less of a chance of damaging the rubber because there is no oxygen or water vapor inside them.

To the OP, this is why the internet is often called the "errornet" so much false information being thrown around. Do yourself a favor and do a search on nitrogen in tires and learn for yourself.

The primary advantages is that because you don't have the H2O in your tires anymore, you won't see the wide pressure fluctuations with temperature changes. Properly inflated tires help with better handling, and better gas mileage. Nitrogen helps to keep your tire pressures more stable, thus giving you those benefits.

Of course, whether you use compressed air or nitrogen, the key is to check your tire pressure regularly which the majority of car owners do not do. You lose less tire pressure with nitrogen from month to month then you do with compressed air. Typically with compressed air, tires lose 1-2 psi each month. So if you are like me and don't like to mess with it every month, that could be another benefit of using the nitrogen.

The place I use does refills for free, and it was a minimal charge to switch to it initially. To each his own, but please don't just take some blanket statement and treat it as true without doing a little research of your own. This applies to just about anything you read on a forum like this!

Cheers!

[noisemker]

just curious at what temp that pressure is rated

[OUR72GTO]

We need a female Moderator.

I nominate Abygale.

[tradosaurus]

http://www.motorsportreport.com/inde...=1:latest-news

Basically the ideal gas law states that every gas expands with temperature. Nitrogen just doesn't expand as much as oxygen and since air is 75% Nitrogen the air won't expand as much as oxygen and a little more than nitrogen.

By the way if you want to put nitrogen in your tires how to evacuate all the air in the tires before replacing with nitrogen?

I think I'll stick with 75% Nitrogen.