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15/9/2023 at 12:39pm
Location: London
Outfit: Lunar Cosmos 524
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Not sure too many people expect the gauge on a forecourt pump to be accurate, and from rather unscientific anecdotal checking/comparisons by various people/organisations over the years that expectation seems to be justified!
I'd use one to inflate my tyres, BUT I'd use my own gauge to verify pressure, as wouldn't trust an unknown gauge!
They will be accurate enough at manufacture, but have heard that Trading Standards who have responsibility for checking continuing accuracy don't have the resources to do so, so they are largely unchecked and could be wildly inaccurate!
Just had my car serviced at a main dealership, when I checked tyre pressures (verifying they were inflated to heavily loaded pressures for towing the van) I found they were not at the recommended pressure, but over inflated for normal running and underinflated for heavy loads! It went into garage with them at loaded pressure, so someone has meddled with the inflation to an incorrect figure, now that could be a incompetent fitter, or an inaccurate gauge on their airline, but either way, not to be trusted!
Often overlooked is that recommended tyre pressures are COLD figures as you mention, even a short journey to garage can raise the pressure by the heating of the tyres due to flexing and heat from brakes. I recently fitted Tyrepal pressure/temperature sensor system to my caravan wheels, and it was 'enlightening' (well aware of the technical facts, but not the timing before fitting) at how quickly the tyre pressure (and temperature) rose once on the road, within only a mile the pressure was well up and close to the maximum that it reached on a much longer journey! Set your pressures to recommended figures, even with an accurate gauge, after driving any distance to a forecourt and you'll likely be technically underinflated!
AND as some do, the practice of deflating hot tyres to get back down to the recommended figure is just WRONG! Allowances are made for normal pressure increase in hot tyres, even the MAX allowable pressure marked on the sidewall is a COLD figure, not a pressure never to be exceeded under running conditions!
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17/9/2023 at 11:36am
Location: London
Outfit: Lunar Cosmos 524
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Quote: Originally posted by trog100 on 16/9/2023
.. i dont think its as critical as some people think it is..
trog
When I first picked my van up from the dealers, it handled like a total pig, despite the nose weight subsequently turning out to be very heavy (heavy nose weight generally improves handling!), even at moderate speeds on reasonable roads the ATC was kicking in frequently, I wondered what the hell I'd bought if it was so bad at 40 and 50mph! Turned out the tyres were under inflated, only a few PSI, but more significant percentages - one by 15%, the other by 20%! After inflating to correct pressure and lightening the nose weight it's been a dream to tow in all conditions over thousands of miles, even at accidental over 70mph.
So maybe tyre pressure is not so critical on some vans, no personal experience to pass comment on, but certainly on others it can be the difference between a 'dangerous' liability and a dream tow!
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Topic: Tyre pressure
via mobile 15/9/2023 at 4:16am
