Reducing tyre pressure

[OneForTheRoad]

If the tyres are hot reduce by 2psi , you won't be far off the cold pressure. .

 

[ALFAitalia]

Bit more than that....

 

[Mactech]

Best we don't introduce the problem of how dry the air was when it went into the tyre....
Most, if not all air compressors have a dryer attached. Unfortunately, they are the most likely part of the system to go wrong and many are pumping very moist air into tyres. This can often double the pressure rise with temperature
This is the only real reason to fill tyres with nitrogen rather than (badly) compressed wet air. Nitrogen is always dry out of the bottle.

 

[alabbasi]

2 pages! There be many tire pressure reduction experts on this forum

 

[Mactech]

2 pages! There be many tire pressure reduction experts on this forum

Unfortunately, I think we are just piling on the pressure.....

 

[Gollom]

Unfortunately, I think we are just piling on the pressure.....

Personally I am tyred of the whole thing

 

[ToeKnee]

I'm not going to comment and inflate the post count.....

 

[HappytalkAgain]

This is the only real reason to fill tyres with nitrogen rather than (badly) compressed wet air. Nitrogen is always dry out of the bottle.

I used to get my tyres fitted at a place in Carlisle (Gates Tyres). They used to offer nitrogen inflation for just a few quid per corner. (I always accepted). I then started to use a new place nearer home and never once thought to ask them about the option.

Is it still offered at mai stream places I wonder?

 

[ALFAitalia]

No advantage on the road whatsoever for 99% of cars driven on the road and you won't be able to tell the difference if you had air or nitrogen. Pub bragging rights only....oh and of course 78 percent of the air you put into your tyres IS nitrogen!

 

[Bobby Dazzler]

No advantage on the road whatsoever for 99% of cars driven on the road and you won't be able to tell the difference if you had air or nitrogen. Pub bragging rights only....oh and of course 78 percent of the air you put into your tyres IS nitrogen!

If someone is bragging about the air in their tyres then then it’s a sorry state of affairs. It would take a special person to do it, and another special person to listen

 

[ToeKnee]

I wonder if MissyD ever got round to reducing the pressure in her tyres......

 

[BTB 500]

If the tyres are hot reduce by 2psi , you won't be far off the cold pressure. .

FWIW ... on our caravan we have a TPMS that shows the real-time temperature and pressure of each tyre while towing. An alarm triggers if the pressure goes 20% over the cold setting, and we have reached that sometimes in hot weather. Tyre temperature routinely hits 50C or more - the default alarm for that is 70C.

 

[190]

FWIW ... on our caravan we have a TPMS that shows the real-time temperature and pressure of each tyre while towing. An alarm triggers if the pressure goes 20% over the cold setting, and we have reached that sometimes in hot weather. Tyre temperature routinely hits 50C or more - the default alarm for that is 70C.

The percentage rise between cold and running pressure can be used to determine if the cold pressure was sufficient in the first place. It's used commonly enough on motorcycle tyres. In general anything in excess of 20% is considered as the cold pressure being too low.

 

[MissyD]

I wonder if MissyD ever got round to reducing the pressure in her tyres......

Yes, I did reduce it using @tonysmb's method