The worst damage a kerb does is not usually where people look for it. When a wheel goes into one at an angle, the tyre is trapped for an instant between the kerb face and the edge of the rim, and the rubber that takes the crush is the last inch above the bead, low down where the sidewall is thickest and where the rim flange keeps it out of sight. What that leaves is a short cut or a crushed line running along the tyre, and it is the least survivable damage a tyre can carry, because the bead area is the part holding the whole thing onto the wheel.
It very rarely fails on the day. The tyre holds pressure, the car drives normally, and the cut works itself deeper over the following few days until the remaining cords in that area let go, usually with no warning worth the name. So the useful minute is the one straight after the impact. Crouch down and look at the bottom of that sidewall where the rubber meets the rim, on both faces of the wheel, before you get back in and drive off. If there is a cut, a nick or a flat crushed area down there, the tyre wants replacing where it stands rather than after another week of one way systems.
With children or an older passenger in the car, waiting is the problem, not the tyre. One call and a technician is on the way to the exact spot in EC1R, with the replacement already loaded, and you know when he will be there rather than hoping. The St John Street phone and the Farringdon Road phone ring the same fitter, any hour. Midnight in the Amwell Street area, midday in Exmouth Market, the same call either way.
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The street pattern here is old and unforgiving. Tight one ways, cobbled corners around Clerkenwell Green and kerbs that sit higher than modern ones mean a lot of wheels meet stonework at an angle, usually at walking pace and usually while the driver is concentrating on something else entirely. That is how a pinch cut happens: slowly, quietly and without any of the drama you would expect from something that later destroys a tyre at speed. If a wheel goes into stonework hard enough that you feel it through the seat, the moment to look at the tyre is then.
A driver squeezed past something parked badly and put a front wheel into the kerb at an angle. The tyre looked fine from standing height. Kneeling down beside it showed a crushed line an inch above the rim edge.
The kerb strike had happened on the Monday and the tyre gave out on the Friday with the driver nowhere near a kerb at the time. The two were the same event with several days in the middle of it.
The impact that cut the tyre had also caught the flange, which we checked over before anything new went on. A wheel edge with a burr or a flat spot in it does not give a replacement tyre a fair chance of holding air.
Holding air proves the tyre is not punctured. It says nothing at all about the cords in the bead area, which is where a kerb strike does its damage and where the rim edge hides it from view. Two minutes crouched beside the wheel, looking at the bottom inch of sidewall on both faces, settles the question.
Because a repair is only permitted in the tread, and the bead area is not merely outside that, it is the part that seals against the rim and carries the tyre on the wheel. Rubber crushed or cut there has lost the cords that do that work, and nothing bonds them back together.
The cut usually does not go all the way through in one go. Enough is left intact for the tyre to behave normally, and then every mile flexes that spot, opens it a little further and moves the load onto fewer cords. The failure comes when the last of them give, which has nothing to do with where you happen to be.
Do as little as possible with the controls. Steady hands on the wheel, ease off the accelerator and let the car shed its own speed, then look for a way off the main road once it is slow enough to steer properly. Hazards on, everybody out on the pavement side, and tell us the street you have ended up in.
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