Nitrogen

[forceofnature]

Guys,
      The only and I mean the only reason the N2 is used in any tire application is because N2 is devoid of moisture. As your tires heat cycle from cold to hot and back again, the moisture in the air that the tire was originally filled with condenses thereby puddling causing differences in the balance of the tire at different temp points throughout its entire thermal application range.

Nitrogen, my friends, is not immune to Charles' law: i.e., v1/v2 = t1/t2. Or for you non chemical types: As we heat a volume of gas at a given pressure the volume of a given mass of gas (any gas-N2 Air, Argon, C02, or O2) will expand proportionally to its absolute temperature and create higher pressures, but retain the same mass; hence the 5 psi rule.

So what does this mean to you?

You get on yer scoot on any given day and heat the flip out of yer tires and they will not only have 5 psi greater pressure but a smaller contact patch as well from the volume increase per charles law. After all they are a fancy balloon.

Having said that I'll just fill up my tires at the gas station for a quarter!  

True

 

[tinbender0]

So do you evacuate the air out of the tires.?T o 500 microns or what? Then apply the nitrogen???I'm so confused

 

[Narcissus]

Don't forget that water is lighter than air.

H2O = 1 + 1 + 16 = 18 g/mol
O2 = 16+16 = 32 g/mol
N2 = 14+14=28 g/mol

 

[Narcissus]

(tinbender0 @ Oct. 05 2006,20:38) So do you evacuate the air out of the tires.?T o 500 microns or what? Then apply the nitrogen???I'm so confused

Yes, evacuation is the proper method, hence the special equipment. It is important to remove all water vapor.

1% or 0.1% may seem insignificant, but that's like saying having 1 part per hundred of arsenic in the air is 'small enough' that it's safe to breathe. Some understanding of general chemistry and thermodynamics helps here.

 

[tinbender0]

(Narcissus @ Oct. 06 2006,11:01)

(tinbender0 @ Oct. 05 2006,20:38) So do you evacuate the air out of the tires.?T o 500 microns or what? Then apply the nitrogen???I'm so confused

Yes, evacuation is the proper method, hence the special equipment. It is important to remove all water vapor.

1% or 0.1% may seem insignificant, but that's like saying having 1 part per hundred of arsenic in the air is 'small enough' that it's safe to breathe. Some understanding of general chemistry and thermodynamics helps here.

well how do you evacuate a tire? will the negative pressure from evacuation deform or compromise integrity of the tire? i would think it would flatten the sucker out....

 

[Narcissus]

(tinbender0 @ Oct. 06 2006,17:29)

(Narcissus @ Oct. 06 2006,11:01)

(tinbender0 @ Oct. 05 2006,20:38) So do you evacuate the air out of the tires.?T o 500 microns or what? Then apply the nitrogen???I'm so confused

Yes, evacuation is the proper method, hence the special equipment. It is important to remove all water vapor.

1% or 0.1% may seem insignificant, but that's like saying having 1 part per hundred of arsenic in the air is 'small enough' that it's safe to breathe. Some understanding of general chemistry and thermodynamics helps here.

well how do you evacuate a tire? will the negative pressure from evacuation deform or compromise integrity of the tire? i would think it would flatten the sucker out....

http://www.google.com

Search: fill tires with nitrogen


http://www.rtitech.com/2005%20....age.htm

 

[tinbender0]

dayum,,,,,,,people are serious aren't they...got some in my truck think I'm going to try it out in a year or two

hmmmmm

 

[badassbusa03]

Nitrogen FAQ's

I had the busa tires filled to 38psi little over a month ago, and they have help and maintained constant pressure. it really hasnt been long enough to really tell. but from what i am experienceing so far, i cant complain.

 

[Learjett]

(Guclu @ Jul. 15 2006,11:57) Using nitrogen instead of compressed air has distinct advantages , which lead to immediate benefits for the vehicle owner . It has more mass , so it migrates through the tire three to four times slower . So tires hold their psi much longer . It runs about 20-25% cooler . Less heat results in less tire degradation . It drastically reduces oxidation on the rim and inner-liner (nitrogen systems almost totally eliminate oxygen -- the cause of oxidation -- from the mix) .

I am the Aviation Department Manager for a Corporation and I can assure you that nitrogen is definitely the way to go. Every airplane (Jets, Turboprops, etc) use nitrogen exclusively in all tires. As a result, everyone of us (riders) have nitrogen in our motorcycle tires as well, especially this time of year in the south where some cold mornings the tires would be underinflated, while the afternoon might bring 80's and low 90's temps. ...IMHO of course

 

[Wag]

What happens if you're out on the road and you need to re-fill the tire with air at a gas station? Can you fill in if there is nitrogen still in the tire?

--Wag--

 

[Learjett]

Oh, I mentioned that we at the airport use nitrogen in our bikes as well but forgot to give some reasons why.... sorry. There "can" be a number of advantages to using nitrogen in bike tires for the same reason. One website http://www.nitrogendirect.com/ has some pretty good questions and answers about this subject. You will maintain a more constant pressure across the temp range, non-flamable, and non-corrosive (you need to maintain at least 95% nitrogen to have a good effect on corrosion) ...especially interesting for those who have custome aluminum or some exotic metal wheels to prevent corrosion. Tire manufacturers of aviation tires have found that a tire underinflated by 5% will show 30% more wear over the same period of time, than a tire that has remained within the 5% tolerance of recommended pressure.

Lots of good reasons to go with N,7... however, to be have the maximum effect the tire needs to be purged, (dry) and contain at least 95% nitrogen. To the question of adding "air" while on the road (hopefully with N you won't need too) ....the Busa manual recommends 42psi front and rear. So basically, if you start out with 100% N... and want to bring your tire pressure up a couple of pounds with a shot of gas station air, all of sudden you are below the 95% required volume to attain maximum benefit.

Bottom line, for most of us it's like oil in the Busa... everyone uses something different and yet, our bikes (for the most part) continue to run just fine no matter what we swear by. Do it if you have the time or just grab the air hose.

 

[Learjett]

(Wag @ Oct. 06 2006,20:37) What happens if you're out on the road and you need to re-fill the tire with air at a gas station?  Can you fill in if there is nitrogen still in the tire?

--Wag--

yes

 

[Ruth|ess]

(Wag @ Oct. 06 2006,17:37) What happens if you're out on the road and you need to re-fill the tire with air at a gas station?  Can you fill in if there is nitrogen still in the tire?

--Wag--

yes you can add air its not gonna hurt anything besides the money wasted putting it in your tire and the feelings of some who have obsessive compulsive disorder.

In my own, if you dont know how to ride a bike with a cold tire compared to a warm you should still be on a ninja 250.. or possibly a Vespa

 

[Ruth|ess]

BTW: my last comment was not bashing anyone this is actually a really good thread with lots of info in it...
Ride Safe! Ruth

 

[Wrath]

We all know air expands when heated, Nitrogen will fluctuate in pressure but at a fraction of plain air. That makes the air build up much more predictable & is the reason they use it in NASCAR & such. Tires will heat up due to the friction of the road & will transfer to the Nitrogen.