Unfortunately, Kwik Fit are now our company car tyre supplier.

They have sent out the following on a flyer:-

What a crock of ****!

Another reason to go cash for car!

Steve

Nitrogen? I wouldn't trust a quick fit fitter with oxygen were it not for the fact that he needs it to breathe!

Eh? Nitrogen is an inert gas yet you suggest it is more reactive than Oxygen?

- They should fill tyres with Methane from cows though! That's cut down on the greenhouse effect!

errrr - it's true. e.g. see here:

Tyres : Car tyre safety advice - filling with nitrogen - The AA

and why wouldn't you trust a kwik-fit fitter with nitrogen? it's inert. (I remember being highly amused when watching terminator at the cinema - at one point arnie freezes the robot bloke with liquid nitrogen - a pillock in front of me shouted 'chuck a match!' - errrr, why?)

Gordo

errr it's not, read the last bit:-

Steve

More money then sense?! Nitrogen FFS.

TX.

^^ in your wallet

TX.

how do they get all the air out the tyre? Even popping the valve only gets you down to ambient air pressure so plenty left in the tyre.

They get MODS to suck the atmosphere out of them - Much like in here

Good point, I doubt they vacuum it out!

So, by rough calculation, you'd start with 1Bar (absolute) in the tyre. My car takes about 2Bar (gauge) or 3Bar (Abs) so a third of the volume (assuming constant temp) would still be air.

So, 21% of air is oxygen therefore 7% of the tyre would still have oxygen in it!

Myth -BUSTED

Steve

It's true, but impractical.

Race cars teams use nitrogen to get more consistent behaviour from the tyre.

I have my tyres filled with Krypton at every possibility. Well that's what Charlie Brown's charge me for.

F1 cars have tyres inflated with nitrogen

You probably get more nitrogen in if you use a vacuum pump (very slow though).

When I worked in a/c, we often filled the tyres on the van with Nitrogen (used to carry bottled of the stuff for pressure testing). Not for performance, but because the manager refused to get the punctures sorted in a timely fashion. At one point my van had three punctures; one on the spare and two on the road wheels. Had to re-inflate them on every journey (only took a few seconds with full bottles).

Problem was one day we ran out of Nitrogen. Flat tyre, flat spare, so used a little R22. Not a clever idea, owing to its rate of expansion when it gets warm (nor the ozone).

If you fill your tyres with Nitrogen, remember that you will need a re-map ... if you don't it is well documented in the ***** of SN that the wheel will detonate and drop a valve!!

That will be £600 please - ching, ching ...

Only £600?

Bargain!

How much would it cost to fill your average everyday car tyre with Nitrogen then??

Nitrogen air fill is free at loads of places, you just have to request it. Been using it for the past 3 years

It has questionable vale on a road car...

EFA

Wot, you mean like, as in, er, fresh air - cool

mb

Post of the day award goes to...

Unfortunately all that 100% N2 theory goes out the window when you get out the footpump the next month to top up the pressure................

Youll need your own nitrogen cylinder if youre using it in a track car too.

.. really who gives a ****

In theory nitrogeon filled tyres don't lose pressure so you won't need to top up each month.

haha - it's still right. you disputed the facts in your original post, which were all true. you're now questioning how it's done in practice, which is different. I agree I wouldn't pay Kwik-Fit to fill my tyres with nitrogen (or anyone else, for that matter, as Im not driving a 'race' car), but that doesn't mean the benefits of doing so are wrong.

but the main reason I wouldn't take a car to kwik-fit is I wouldn't trust them to do anything

I'm a bit of a nerd , but here goes:

Using 2 barg as the inflation pressure and the fact that we don't have a vacuum pump to hand.

With tyre temperature at 10C, for a 10C rise in temperature the density change is 2.3% less using Nitrogen.


A few years ago someone asked about filling 4 tyres with Helium, on standard classic rims, If I remember correctly there was a 244g reduction in weight.


Nik

The reason nitrogen inflated tyres vary less in their pressure vs temperature response is that there is less water vapour. Using compressed air inevitably introduces water vapour which changes to steam when the tyres get hot. My tyres were inflated with nitrogen at the factory and the dealer use it, but I still adjust the pressures with air for seasonal changes and when the dealer ***** up the correct tyre pressures. I wouldn't spend my own money on nitrogen.

Ive got 2 bottles of N2 on my van. Never used it for my tyres but did used to use it to blow up the kids paddling pool in the summer

Chip