A screw can sit in a tyre and only leak while the wheel is turning. Parked, the tread is unloaded, the rubber has closed itself around the shank, and the hole holds well enough to fool a gauge and to fool the car's own warning system. Roll the same wheel and every rotation drags that patch of tread through the contact patch, where it is squashed flat and then springs back. The hole is worked open and shut on each turn, and air walks out past the threads a little at a time.
Which is exactly why this one turns into a night call so often. The car stands outside all evening reading perfectly normal, then you set off before six and the warning appears somewhere in the first couple of miles. Pumping it up buys another journey and proves nothing. A torch will not settle it either, because the head of a roofing screw wears flush with the tread inside a few hundred miles and looks like a piece of grit unless you get your hand on it. We work under our own lamps, take the wheel off, run a palm across the tread and then look at the inner liner, where a leak that behaves like this leaves a clean bright mark you cannot argue with.
The A3 at two in the morning is quiet right up until you are stood next to it with a flat. We are out around Stockwell Green and the rest of Stockwell through the night. The wheel comes off in Larkhall, not on a ramp in Vauxhall. Nothing is towed out of South Lambeth or Larkhall; the work finishes there.
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The traffic along the Clapham Road never really stops, which is why screws and nails end up spread across the lanes and why so many of these calls come from drivers heading out for early shifts. The frustrating part is that the tyre behaves impeccably while it is parked, so the problem only ever surfaces when you have somewhere to be. Since the car does not need to move for us to work on it, an estate bay in Stockwell Park at four in the morning is as good a place as any.
A car parked overnight on a street off South Lambeth Road read correctly on a gauge at midnight and had a warning light on before the driver reached the end of the road. Nothing had changed except that the wheel had started turning.
A screw head worn level with the tread showed up when a hand went over it and not before. Under a lamp it looked exactly like the grit that gets pressed into every groove on a busy road.
A late job in a bay near Stockwell Park with the car left exactly where it stood. The mark on the liner sat directly under the screw, which is the confirmation worth having before anybody repairs anything.
Because a standing tyre is not flexing. The rubber has closed around whatever is in it and the seal holds. Driving squashes that section of tread flat once every rotation and lets it spring back, and the hole opens and closes with it. Air escapes on the move and almost nowhere else.
It means the car sat still. The test is not whether it holds pressure overnight, it is whether it holds after a run. If a tyre is right when you set off and low when you arrive, the object is still in there and it is still working itself deeper.
Yes, because we do not rely on looking at it. The wheel comes off, the tyre comes off the rim, and the inner liner shows where air has been passing through. Our own lighting comes with us, so a dark street is no different from a lit forecourt.
If you need the car early, call now. We run nights the same as days, all year, and dealing with it at two in the morning means the tyre is repaired rather than shredded during a drive you could not put off. Typical arrival is 30 to 60 minutes.
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