Air shrinks when it gets cold, and the size of that effect surprises most drivers. A tyre set correctly on a mild afternoon can read a couple of psi lower after one clear night, with nothing whatever wrong with it. Nothing has escaped. The same air is simply taking up less room, and a gauge is honest about that in a way your eye is not.
So a good share of the calls we take in the colder half of the year end with somebody being told they have nothing to buy. Separating weather from a genuine leak is not clever work, it is patient work. Temperature moves all four tyres by roughly the same amount. If the odd one out is down while the other three sit level, that is a leak.
Set them cold, first thing, before the car has turned a wheel, and write the four numbers on the back of something. If they are all still there a week later, the cold did it and a gauge has saved you a tyre. If one has quietly slipped again, ring us and we will find where it is going.
Screws and nails collect where traffic slows and stops, which in KT1 usually means Kingston Bridge and the parking around Norbiton. Pick one up and the only real question is whether it can be repaired. The wheel comes off in Kingston Hill, not on a ramp in New Malden. Nothing is towed out of Norbiton or Canbury; the work finishes there. The KT1 postcode and a street in Hampton Wick: that is enough.
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Most cars around Surbiton and the terraced streets towards Norbiton stand outside all night, so every tyre takes the full swing between a mild afternoon and a cold, clear morning. That swing is precisely what hides a genuine slow puncture for weeks. Gauge all four cold, on the same morning, a week apart, and the odd one out loses its cover.
A car on a driveway near Kingston Hill threw a warning light after the first proper frost. All four had lost about the same, the pressures went back up and stayed up, and nothing was found in any of them. The system had reported honestly.
The two things happen together more often than either gets diagnosed alone. A tyre with a fine nail in it loses a little every day and a lot on a cold night, so the weather takes the blame until the morning it will not hold at all.
Pressures set straight after a run along the A307 Richmond Road are set warm, which means they are set low. The car cools overnight and reads under in the morning. Cold is the reference the door plate is written to, and cold means properly cold.
Possibly not. Check all four with a gauge rather than by eye. An even drop across the car is temperature, and a pump sorts it. One tyre well below its neighbours is a leak, and driving on it turns a repair into a purchase.
No. The figure on the door plate is already the cold figure, so adding to it puts you above specification once the tyres warm on the road. Overinflated tyres carry the car on the middle of the tread and wear out down the centre.
Not meaningfully. Nitrogen is most of what is in there already and it contracts in the cold like anything else. The real benefit is a slightly slower loss through the rubber over months, which is no reason to stop checking.
Yes, and you hear that plainly when it is the answer. Gauging four tyres and finding nothing wrong is a short visit and a straight verdict. We would rather do that than leave somebody guessing at a sound tyre all winter.
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