Not my week, slow puncture

Why don't you top up the tyres yourself?

[rictus01]

Originally Posted by DJFridge

Ha! The wallet-weightloss for the nitrogen was only £1 per wheel, which I figured wasn't too bad. And they'll top it up foc over the life of the tyre, so it's cheaper than topping up at the garage now they all charge for air. If I'm going to get charged for air, it might as well be special air!!

you do of course know air is 78% nitrogen anyway don't you

it's been used for greater stability at varying temperatures but you're unlikely to reach those in normal use, still something for the pub chat I guess.

Cheers Mark.

[yorkie_chris]

Originally Posted by DJFridge

Ha! The wallet-weightloss for the nitrogen was only £1 per wheel, which I figured wasn't too bad. And they'll top it up foc over the life of the tyre, so it's cheaper than topping up at the garage now they all charge for air. If I'm going to get charged for air, it might as well be special air!!

Buy a foot pump.

Originally Posted by rictus01

you do of course know air is 78% nitrogen anyway don't you :sm102

it's been used for greater stability at varying temperatures but you're unlikely to reach those in normal use, still something for the pub chat I guess.

Cheers Mark.

Nitrogen is no more stable at any temperature than air, unless you get to point where stuff starts to combust. Impossible to reach that in ANY use!

Only "advantage" is a tin of nitrogen is dry, as it's procured by distilling liquid air. So some plausible advantage if you're lab-grade careful about making sure EVERYTHING inside the tyre is dry, so fit the tyres in a dry chamber, with no rim soap... Loada bollox...


I have a foot pump, and a cylinder of nitrogen here. Anyone who has an infrared thermometer and a pressure gauge is welcome to come around and fill them both ways and go for a ride to observe the difference that doesn't happen.

[rictus01]

I was never good enough to warrent the expense when I was in the paddock (spent most of my time and money repairing things), but there were some who wouldn't use anything else and that was there reasoning.

here's an extract from popular mechanics, so not just hear say.

First is that nitrogen is less likely to migrate through tire rubber than is oxygen, which means that your tire pressures will remain more stable over the long term. Racers figured out pretty quickly that tires filled with nitrogen rather than air also exhibit less pressure change with temperature swings. That means more consistent inflation pressures during a race as the tires heat up. And when you're tweaking a race car's handling with half-psi changes, that's important.


Read more: Nitrogen vs Air In Tires - Why Nitrogen in Tires - Popular Mechanics

Cheers Mark.

[yorkie_chris]

Originally Posted by rictus01

I was never good enough to warrent the expense when I was in the paddock (spent most of my time and money repairing things), but there were some who wouldn't use anything else and that was there reasoning.

here's an extract from popular mechanics, so not just hear say.

First is that nitrogen is less likely to migrate through tire rubber than is oxygen, which means that your tire pressures will remain more stable over the long term. Racers figured out pretty quickly that tires filled with nitrogen rather than air also exhibit less pressure change with temperature swings. That means more consistent inflation pressures during a race as the tires heat up. And when you're tweaking a race car's handling with half-psi changes, that's important.


Read more: Nitrogen vs Air In Tires - Why Nitrogen in Tires - Popular Mechanics

Cheers Mark.

Well I've read that too, often from people selling nitrogen.

Why does it exhibit less pressure change?
Why does it migrate more slowly? (N; 14, O;16) Given that I'm not a chemist, or a micro-fluid-dynamicist or whichever clever lot knows of these things I can't see a bigger lump going through a hole more readily than a little un...

I am of opinion that if an argument is supported by one incorrect fact stated as true then rest of it is very suspect. Maybe I misread the science behind it...

[rictus01]

have you actually used it chris in a race enviroment

I haven't but I know of those that do, like you I know little of the science, but will say very little gimmick stuff says around in racing if it serves no purpose, and this has.

Cheers Mark.