A mile is roughly eight hundred turns of the wheel. That number is worth holding onto, because distance is not really what decides whether a tyre survives being driven on empty. What decides it is how many times the sidewall gets folded flat against itself and pulled straight again, and how hot it gets while that happens.
So the questions on the phone are how far, how fast, how heavily loaded and how empty. Walking pace to a safer spot on a warm evening is usually survivable. The same ground covered briskly, on a cold road, with four aboard and a full boot, very often is not, because cold rubber is stiffer and folds harder.
What follows is a check rather than a guess. The wheel comes off, the bead is broken, and the tyre gets examined inside and out before anybody agrees to repair the hole that started all this. Plenty of them pass, which is worth saying, because most people ringing us have already assumed the worst. When one does not, you get told why with the evidence lying on the ground in front of you.
The repair takes about as long as a coffee, which is why it is worth doing at your workplace rather than anybody's workshop. A bay in an office or retail car park around Tolworth is enough room. Old tyres leave Tolworth, Long Ditton and KT6 with us, every time. You watch it happen in Alexandra Drive, or at the kerb in St Marks Hill.

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The temptation in Surbiton is the queue toward Kingston upon Thames, or the run south down the A240 Ewell Road, both of which feel as though they must be nearly over. They are not, and a tyre going down does not care. Where a car can be stopped safely on a side street off Victoria Road, it is nearly always worth stopping.
About two hundred metres to get clear of a blind bend, done at little more than a walk. The tyre showed nothing at all inside, the nail was central, and it took an ordinary repair. Moving that far was the right call.
A car driven the length of Brighton Road with no air in one tyre. Inside the sidewall sat two clean circumferential lines where the rim edge had pinched the rubber against the road on every revolution. Nothing repairs that.
Valve and balance weights no longer lined up with where they started, which means the tyre had slipped round on the wheel while it was flat. That drags the bead across its seat and chews it. Replacement, and the seat cleaned up first.
More than distance does. Every revolution folds the sidewall, so speed sets how many folds happen per second and how much heat has nowhere to go. A long slow shuffle is gentler than a short quick run, which is the opposite of what people assume.
The inside face of the sidewall, the bead heel and the seat it sits against. Damage from running flat happens on surfaces sealed away while the tyre is mounted. From outside, a ruined tyre and a sound one can look identical.
No. Holding air is what a tyre does until the cords let go, and cords that have been overheated hold air right up to the moment they stop. The verdict comes from looking at the casing, not from watching a gauge.
Yes, and it is worth checking at the same time. Running on the flange rolls the lip over on a soft alloy and scores the seat. Light marking cleans up while the tyre is off. A wheel that is genuinely bent wants a refurbisher.
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