Winter air replacement month

It’s the first time I’ve ever heard of ‘replacing air’. Typically I check pressure (and wear) once a month. Even when I lived in the Snow Belt or in Europe, either I changed from summer to winter tyres (and rims), or had a year-around tyre. I pay particular attention to the big swings, because ambient air temperature will (obviously) change tyre pressure. Otherwise, I’m a lost of ‘replacing air’.
 
Marcoose said:
For Mr Simpleton here, what is ‘replacing air’ ?
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It's all about temperature and density. Cold air is denser than warm air and therefore heavier. Although heavier, being denser it expands less so you need more heavier winter air to get the same amount as summer air in the tires.
The downside is a loss of economy and performance due to the extra weight, however this is balanced by the colder denser winter air allowing more air into the fuel/air mixture.
It's a very exact science, the formulae are pretty complicated.
 
Ah, I see, the smart lads are up and full of energy. Brilliant.

But what is ‘air replacement’ ? You remove the air in the tyre and replace with … new air, hydrogen? Because checking pressure is just adding or bleeding a bit. Dafuq is ‘air replacement’?
 
I do my bit for the environment, i fill car tyres with CO2.
Now if we all did that we could stop global warming.

What could be significant is actual atmospheric pressure.
Are tyre pressures based on the international standard atmosphere.
So only check tyres when atmospheric air pressure is 1013 hPa and temperature 15 degrees C..
So you need a barometer in your car.
Not sure there is space on the dash for that.
Nice brass marine one might do.
 
All joking aside, there is one gas which defies Boyle's first law of thermodynamics, of pressure and temperature being directly related.
It is excreted by a large insect found only in Madagascar, which are 'farmed' to harvest the gas.
It is made up of Carbon Monoxide, Carbon and Potassium; chemical symbol of 'COCK'.
I buy it for my car tyres. It is so rare and expensive that even Amazon don't sell it.
You can buy it directly from the link below. HTH
www.getsomecock.com
 
I live in the south so keep the same air all year round. But I do use a 78% nitrogen mix - if it's good enough to put in 747 tyres, it's good enough for me.
 
smorris_12 said:
I live in the south so keep the same air all year round. But I do use a 78% nitrogen mix - if it's good enough to put in 747 tyres, it's good enough for me.
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Actually most commercial and military aircraft tyres are inflated with 100% nitrogen….primarily to avoid moisture being injected into the tyres which would freeze altitude..in addition the CO2 content of normal air tends to diffuse through the rubber more easily than other gases… :thumbsup:

https://www.dunlopaircrafttyres.co.uk/aircraft/boeing-737-next-generation-tires/
 
So ‘air replacement’ is simply add more air. Go figure. Christopher, back to your query, check tyre pressure about once a month irrespective of season. Keep an air pump in the boot anyway, and tyre patch kits, because as YouTube you’ll tell you, there’s no spare in your Zed.
 
B21 said:
Actually most commercial and military aircraft tyres are inflated with 100% nitrogen…
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Exactly. I never go above 3,000ft so I only use 78% nitrogen. I'm lucky that I know someone who can supply this mix at very reasonable rates.

I can probably organise a group buy if anyone's interested.
 
smorris_12 said:
B21 said:
Actually most commercial and military aircraft tyres are inflated with 100% nitrogen…
Click to expand...

Exactly. I never go above 3,000ft so I only use 78% nitrogen. I'm lucky that I know someone who can supply this mix at very reasonable rates.

I can probably organise a group buy if anyone's interested.
Click to expand...
Not sure anyone is picking up on this. Very well thought out. :thumbsup:
 
enuff_zed said:
smorris_12 said:
B21 said:
Actually most commercial and military aircraft tyres are inflated with 100% nitrogen…
Click to expand...

Exactly. I never go above 3,000ft so I only use 78% nitrogen. I'm lucky that I know someone who can supply this mix at very reasonable rates.

I can probably organise a group buy if anyone's interested.
Click to expand...
Not sure anyone is picking up on this. Very well thought out. :thumbsup:
Click to expand...

I was going to point out the diurnal effects on tyre pressures but decided to pass… :tumbleweed:
 
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