Nitrogen in tyres

[jcupit69]

if memory serves correct the new nissan GTR had special tyres designed for it that are filled with nitrogen???

[boman]

We used to fill our transam light tyres up with nitrogen. We found that the pressure did not increase as much when the tyre was hot, as it did when using compressed air. This was handy so you did not have to worry about the pressure altering the tyres contact patch during a race. On a road car, ,if my memory serves me correctly, the pressure can increase by around 5 - 10 psi during normal driving. Which is why you should always check tyre pressures COLD not after they have been driven on.

[vifferman]

Nitrogen in tyres kills baby fur seal whales and causes globular yawning.
It's chock full of carbon, y'know, which is why tyres are black.

[Badjelly]

We used to fill our transam light tyres up with nitrogen. We found that the pressure did not increase as much when the tyre was hot, as it did when using compressed air.

Are you sure about that? Because the ideal gas law tells us that the change in pressure due to a given change in temperature is the same for any gas. (Well, any ideal gas, but air and nitrogen are pretty much ideal gases.) So either your observation is incorrect or there's something else going on. And the only something else that I can think of, that's been mentioned on this thread and might be relevant, is that an increase in temperature causes condensed water to evaporate.

[Mikkel]

Are you sure about that? Because the ideal gas law tells us that the change in pressure due to a given change in temperature is the same for any gas. (Well, any ideal gas, but air and nitrogen are pretty much ideal gases.) So either your observation is incorrect or there's something else going on. And the only something else that I can think of, that's been mentioned on this thread and might be relevant, is that an increase in temperature causes condensed water to evaporate.

Air is pretty much nitrogen...

If you read some of the earlier posts it seems that moisture in air compared to clean dry nitrogen is what makes the difference. Water expands a lot when it evaporates.

[Badger8]

ergh, it's late, i'm tired... 5 minute try...

PV = nRT, assume ideal gas law holds (which at the pressures we're talking about, is near enough to true), Less mass to cause sufficient pressure. Look up coefficient of thermal expansion in Perry's Chemical Engineering Handbook, compare it to that of typical atmosphere (or calculate it out at ratios if needs be) even at the not-atall-accurate 80-20 N2 O2 mix (78-16 off the top of my head?) ya can see the difference. it may be sod all, but to some people it's enough to justify it.
Plus there were other benefits mentioned, cant be bothered reading it all. There's some real crap in the air comin outta gas station compressors too.

Ergh, if i dont wanna think about this crap at work when i'm gettin paid to do it, why on earth am i doing it now for free?

[98tls]

Simple really,anyone that rides a road bike on a public road in this country that thinks there is anything to be gained by inflating there tyres with it deserves to move themselves to the states and have the pleasure of being dumb enough to pay for someone else to fill there tyres with it.

[Mikkel]

Saw the thread and thought. "Today is indeed repost day." Turns out today is thread necromancy day...

I'm pretty laid back, 78-80% nitrogen is good enough for me.

[Hitcher]

Turns out today is thread necromancy day...

Indeed there's nothing like a bit of romantic foreplay to get one's day off to a good start.

[Kickaha]

Simple really,anyone that rides a road bike on a public road in this country that thinks there is anything to be gained by inflating there tyres with it deserves to move themselves to the states and have the pleasure of being dumb enough to pay for someone else to fill there tyres with it.

So how do you know without trying it that there is nothing be gained from it?

There is tens of thousands of dollars spent each month in this country putting it in cars, if all those people moved to the States the country would empty reasonably quickly

[98tls]

So how do you know without trying it that there is nothing be gained from it?

There is tens of thousands of dollars spent each month in this country putting it in cars, if all those people moved to the States the country would empty reasonably quickly

And that would be a bad thing?After reading many threads on many bike forums the world over with many posts by some pretty clued up buggers ive never yet seen one post mentioning any benefit to filling tyres in vechicles used under everyday road going conditions so to pay for such a service would seem to me anyway a waste of $

[imdying]

So how do you know without trying it that there is nothing be gained from it?

Because he's not a retard.

There is tens of thousands of dollars spent each month in this country putting it in cars, if all those people moved to the States the country would empty reasonably quickly

Yep, that would be the aforementioned retards.

[Crazy Steve]

You are all wrong ya bunch of muppets.....

And you dont need to be a chemist to figure it out...

Im a truckie and have the answer...

Crazy Steve..

Ps...you are all a bunch of slaves...

[MaxCannon]

From what I've read in magazines and the like the key benefit with Nitrogen is the lack of water vapor compared to normal air.
In a racing situation water heats to boiling point.
Usefull for hot water bottles, not useful inside tyres.

If you are riding hard enough on the road to get the water vapor in your tyres boiling then changing it for Nitrogen will probably get you more consistent pressure and therefore a better gripping / feeling tyre.

Although you'd probably need it since going that hard is going to get some blue and red lights on your tail.

[98tls]

From what I've read in magazines and the like the key benefit with Nitrogen is the lack of water vapor compared to normal air.
In a racing situation water heats to boiling point.
Usefull for hot water bottles, not useful inside tyres.

If you are riding hard enough on the road to get the water vapor in your tyres boiling then changing it for Nitrogen will probably get you more consistent pressure and therefore a better gripping / feeling tyre.

Although you'd probably need it since going that hard is going to get some blue and red lights on your tail.

FFS there will be all these late model Ducati owners up all night squeezing themselves into billon dollar leathers convinced they have to have some,be a hell of a thing to park up and have a latte without nitrogen in your rubberbands.oh the humanity.