nitrogen

Hi
Is there really any benefit of users of road going bikes to inflate their
tyres with nitrogen? are there any negative point about using it??

cyril

 

Not sure *what* was going on, "Cyril Bonnett"

Nitrogen is F_A_S_T

In winter your tires will explode














-Don (don't believe everything you read in a newsgroup)

I, Pooder, aPproved this Post . . . .

 

Not sure *what* was going on, (Kaybearjr) leapt
in with:

[snip some serious stuff]

I think this means "no". The question was for "road going bikes" and
while all that might be significant for someone riding in a race at
the very edge where a few milliseconds can make the difference between
first and second, on the street it would be totally lost . . . .

-Don

Pooder aPproved this Post . . . .

 

"Kaybearjr" <> skrev i meddelandet

Sorry, I might be dense but I don't get this.

 

In the case of a high-volume, high-pressure tire, even if you don't
remove all of the "regular" air (at atmospheric pressure) in the tire
before adding dry nitrogen, you end up with the vast majority of the
stuff in the tire being nitrogen.

In a smaller, lower-pressure tire, the proportion to nitrogen to
atmospheric air is much lower, which significantly reduces any benefit
you intended to get from using nitrogen in the first place. To raise the
proportion, you have to fill and empty the tire a couple of times
(creating one of those really nasty mixing problems that they give you
in chemistry).

I do have a question for kaybear, though. Did you guys air up those
tires to 175psi absolute, or is that guage? I'd have thought that it
would be guage psi, which should change your math a little bit,
shouldn't it?

 

Seems like I've read that nitrogen won't change in pressure as much as air
does. This allows better control of the tire pressure for tuning purposes.

Les

 

Air contains oxygen and that is more chemically reactive.

Ben

http://autos.groups.yahoo.com/group/rockland_mc_riders

 

I just did a quick search on Google and found this...

http://www.branick.com/n2/faq.html

Les

 

I just did a quick search on Google and found this...

I suspect:

Above web site should be read as 'marketing' material.

Nitrogen used in competition tyres mostly to ensure no water (less)
present since I think that as the tyre tempreture changes the water
will cause greater pressure changes than would occur with a pure gas.
I lost my steam tables years ago and would not know what to with them
now anyway.

I thnk that some racing bicycles use helium filled tyres due to the
weight saving. Now they do leak a lot.

 

Why would anybody want to inflate their tyres with Oxygen ? Most people use
air which has a high nitrogen content anyway...

Steve

 

richard cortese wrote

hey the merkins are up.

happy chrimas dudes.

i wave a glass ion your fgeneral direction.

You can all **** off now.

 

Yes, that's what they mean, through the tire, but they seem to ignore that air
is over 70% nitrogen and this means that the partial pressure of the oxygen is
much lower and that will slow diffusion down. But let's play Devils advocate
and say that air diffuses out of a tire 2 times faster than pure nitrogen. It's
inconsequential because the rate of diffusion is slow to begin with. It would be
much more susceptible to changes in pressure by day to day air temps. Also,
anyone who is considering using "exotic" gas in their tires is already probably
checking them fairly regularly.


Ben

http://autos.groups.yahoo.com/group/rockland_mc_riders

 

That does not make sense. Water vapor gas obeys Charle's and Boye's laws like
Nitrogen.

Ben

Ben

http://autos.groups.yahoo.com/group/rockland_mc_riders

 

Shame on you Jack, throwing rocks at a perfectly nice girl like that!!!
Dang you made her cry boy...
Good for you & congrztzz

Grtz, P1

 

One wonders about a tire with a pint of slime in it.

 

Yes, it would be an entirely different matter if there was sufficient liquid
inside the tire but how likely is that to be?


Ben

http://autos.groups.yahoo.com/group/rockland_mc_riders

 

How do you know there is liquid water in the tire?

Ben

http://autos.groups.yahoo.com/group/rockland_mc_riders

 

Jack, I'm not accusing anyone of being full of hooey. I'm just asking questions
with the ultimate goal of either debunking or learning something.
I did a search on the net and yes, indeed, lots of pro racers are filling their
tires with nitrogen. However, invariably, the reason given is that water vapor
expands differently under temperature than "dry" air. In and of itself, this is
not a correct statement. Water vapor is a gas and will obey gas laws.
Some of the sources cite problems with humid days. Well, this may be the
answer. Humid air has larger amounts of water vapor in it and as the vapor
content goes up at 1 ATM, under increased pressure, it is more likely that there
will be condensation.


Ben

http://autos.groups.yahoo.com/group/rockland_mc_riders

 

OK, so I learned something .


Ben

http://autos.groups.yahoo.com/group/rockland_mc_riders

 

I cannot remember this stuff much at all however the behaviour of
water as its temperature rises above boiling point (at whatever
pressure you choose) is not as one (well I) might expect.
At 100 C it does not suddenly all become vapour. At room pressure <g>
just over 100 C there is some kind of mixture of liquid and gaseous
water the ratio being mostly? liquid water and a bit gaseous water vapour.
As the temperature rises the ratio of liquid to vapour falls until at
some higher temperature we eventually have all vapour.

I have no idea how a mixture of water and air might behave however
I suspect that there will be some liquid water in every road
bike tyre in the UK due to the above effects.

The state where all of the water in steam is in the gaseous state is
known as superheated steam. The temperature required to maintain
this state increases with increasing temperature.

As has been stated I believe that the reason that Nitrogen is used by
the racing people is that it is dry. I suspect that the reason that
this is important is that there is liquid water in the tyre
even if it is not visible as a pool running round at the bottom.