Before anybody condemns a tyre it is worth ruling out the cheapest thing on the wheel. A rubber valve stem is a consumable: it perishes with age and with ozone, cracks where it bends over the rim, and starts weeping air long before anything looks wrong. Inside it there is a valve core, a tiny spring loaded item that seals when the cap goes on, and a core that has grit in it or has been overtightened will leak steadily on its own. Both are the work of a couple of minutes to sort and both get blamed on the tyre for weeks.
So a call about air disappearing overnight starts with a bit of soapy water round the valve before anything else. If it bubbles there, that is the job done for very little. If it does not, the tyre comes off the rim and the search moves to the tread, the inner liner and the bead area. That happens on a drive in Croxley Green at whatever hour, because the point of being available at three in the morning is not drama, it is that the car is still where you left it and the tyre has not been driven flat.
Away from home and a flat overnight is the worst combination, because you have no idea who to ring. A hotel car park, a relative's street, a road you have never driven before, Mill End or anywhere else round Rickmansworth. Old tyres leave Maple Cross, West Hyde and Hertfordshire with us, every time. You watch it happen in Loudwater, or at the kerb in Croxley Green.

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Not every tyre losing air has a nail in it, and the valve is both the commonest cause and the cheapest to put right. Checking that first is how you avoid paying for a repair you never needed. Whatever the answer, the work happens where the car is standing, on a drive near the station or out on a lane towards Chorleywood, at whatever hour it suits you.
A car in Moor Park had a valve cracked where it bends over the rim. It had been losing air for a month and had been blamed on a puncture throughout.
A slow loss on a car near Loudwater came from a valve core that had never sealed properly since the last fitting. Replaced in minutes.
Soapy water round the valve on a car in Mill End showed nothing, so the tyre came off. A thorn had gone through the central tread and was still in place.
Very possibly. Rubber valves perish with age and the core inside can leak on its own. It is the first thing checked because it is the cheapest to fix.
A little soapy water around the base of the valve and over the open end, with the cap off. Bubbles mean you have found it.
It should be, every time. A new tyre on a ten year old valve is a false economy nobody notices until it goes down.
Every night of the year, across Rickmansworth and out to Croxley Green, Mill End and the lanes beyond.
The tyre comes off the rim, the casing is read from the inside, and if it is repairable the hole is reamed, plugged and patched to BS AU 159.
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