Tyre pressure is a temperature reading as much as a pressure reading, and that catches people out at night more than at any other time. The figures on the placard in your door shut are cold figures, meaning the car has stood for a few hours and the tyres are at the temperature of the air around them. Drive for twenty minutes and the tyres warm and the pressure rises. Set them to the placard figure while they are hot and you have just let air out of a tyre that was correct.
At three in the morning the whole thing swings the other way. The air is at its coldest, the car has been standing outside since the evening, and pressures read low even in tyres with nothing at all wrong with them. That is why a warning light coming on overnight in winter is so often just the weather. It is also why we check with a gauge and ask how long the car has been sitting before anybody concludes there is a leak. Getting that right stops people buying repairs they never needed.
Cold nights take pressure out of every tyre on the car, and one of them is usually already leaking. We are out on those mornings from before it is light, across EC1M, checking whether it is a genuine puncture, a perished valve or simply four tyres that have all lost a few psi. Whether it is Hatton Garden in rush hour or Clerkenwell Road at midnight, we answer. On Clerkenwell Road, day or night, Charterhouse Street included, arrival across EC1M runs 30 to 60 minutes. EC1M takes in Smithfield and Charterhouse Square, and we work the lot.
24-hour tyre callout in Farringdon is part of our wider mobile 24-hour emergency callout cover. For 24-hour tyre callout in Farringdon, call 07717 389637 or get a price for your tyre.
Cars around Farringdon spend their lives parked outside in metered and permit bays rather than in garages, so they sit through the full temperature swing every night. That makes cold morning pressure warnings common here and mostly harmless. The one that matters is the tyre that has dropped on its own while the other three have not. Look at all four figures rather than only the one the car is complaining about, because the pattern tells you far more than the number.
A car parked overnight near Charterhouse Square showed a pressure warning on a cold morning. All four were slightly low by a similar amount, which is what a temperature drop looks like rather than a puncture.
The same symptom on a different car off Cowcross Street, except only one tyre was down. Even cold, that is a leak, and it turned out to be a screw in the tread.
A driver had set their own pressures straight after a run and then found them reading under the placard the next morning. Nothing was wrong with the tyres, only with when the gauge had been used.
Cold, meaning the car has stood a few hours or has only been driven a mile or so. The placard in the door shut assumes cold tyres. Checking straight after a run gives a higher number, and setting to the placard at that moment leaves you under inflated.
Because pressure falls as the air inside the tyre gets colder, and a sharp overnight drop is enough to take a borderline tyre under the warning threshold. If all four have fallen by a similar amount it is usually weather. If one has fallen alone, it is a leak.
Yes, with a gauge rather than by eye, and we factor in how long the car has been standing. That is the difference between telling you that you have a puncture and telling you that you have had a cold night.
We do, and we would rather that than have somebody drive off on a tyre genuinely going down. If it is temperature we will say so plainly. We work 24 hours a day, every day of the year.
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