Nodge68 said:
My electronic gauge reads the same pressure every time I connect it to the same tyre. This would make every pressure taken as valid. If it were to display random pressures, it would be of little use.
Click to expand...
+1 if it gave random readings I would bin it.:)
 
jedi said:
My old halfords one reads the same all the time....it moves in .5s 1, 1.5 , 2.........its now nearly 10 years old been dropped etc..still working on origional battery...ive never opened it...

Halfords Digital Tyre Pressure Gauge | Auto Express
Click to expand...

Reading the same each time means you have good precision 0.5psi is acceptable resolution but you have no idea of the acuracy. didnt one of the lr mags do a test recently on pressure gauges.
 
remember hippo each time you take your tyre pressure you are loosing a little tiny bit out of the tyre and I bet like me you never get the gauge on properly each time but down to 20 from 28 that is a bit much buy a new one.
 
Nodge68 said:
My electronic gauge reads the same pressure every time I connect it to the same tyre. This would make every pressure taken as valid. If it were to display random pressures, it would be of little use.
Click to expand...
Which one have you got?

teddywood1 said:
remember hippo each time you take your tyre pressure you are loosing a little tiny bit out of the tyre and I bet like me you never get the gauge on properly each time but down to 20 from 28 that is a bit much buy a new one.
Click to expand...
Yep that's what I was thinking.
 
Hippo said:
Which one have you got?.
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I've 3. All repeatedly show the same pressure and all are within 1Psi of each other.
The gauge I keep in my Freelander came from Asda. It was in a set with a tread depth gauge for £5.99 iirc.
 
Mine have nitrogen in them, but to see which of my gauges were correct, I got the tyre place to fill them to 30psi. When I got home I checked all 3. 2 read 30psi, 1 read 25psi. Now I know which ones to trust.
Mike
 
Skinny Mike said:
Mine have nitrogen in them, but to see which of my gauges were correct, I got the tyre place to fill them to 30psi. When I got home I checked all 3. 2 read 30psi, 1 read 25psi. Now I know which ones to trust.
Mike
Click to expand...

If you tested the pressure as soon as you got home, something was wrong. The pressure will start to rise once you start driving.
There's no guarantee that the tyre fitter has an accurate gauge, or knows how to use it correctly.
 
Nodge68 said:
If you tested the pressure as soon as you got home, something was wrong. The pressure will start to rise one driving.
There's no guarantee that the tyre fitter has an accurate gauge, or knows how to use it correctly.
Click to expand...
Pressure in nitrogen filled tyres stays static, as its an inert gas.
Even after a long journey pulling the caravan they are still at 30psi. Whereas the caravan tyres had raised 5psi due to them being air filled.
As for an accurate pressure at the fitters, I'm just happy its the same as mine, so can't be to far out. Most gauges are +- 1-3psi.
Mike
 
Skinny Mike said:
Pressure in nitrogen filled tyres stays static, as its an inert gas.
Even after a long journey pulling the caravan they are still at 30psi. Whereas the caravan tyres had raised 5psi due to them being air filled.
As for an accurate pressure at the fitters, I'm just happy its the same as mine, so can't be to far out. Most gauges are +- 1-3psi.
Mike
Click to expand...

Gauges do very quite a bit.
However
All gasses expand and compress at the same rate, about 1/273rd for each change of one Kelvin degree. Nitrogen is dry but that's about it.
Heat up the tyre, the pressure will increase. Normal air is 78.2 % Nitrogen anyway. Nitrogen filled tyres should reduce inner rim corrosion. I'm not sure how slight moisture would affect the pressure though.
 
Last edited:
i invested in one of these bad boys



kick-the-tires.jpg
 
accuracy is not so important as consistency.


once that is established, then yu can get it calibrated if you need.

chalk test dont have emperical units ;)
 
My local hotdog seller have a nice air filler with auto pressure thinghy next to their gas pump. I see they become more usual at more and more stations around here at the moment.
 
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