The repairable area on a car tyre stops well short of where most people assume it does. It is the central three quarters of the tread width, and the reason has nothing to do with caution. It is about how much that part of the tyre moves.
The centre of the tread runs almost flat against the road. It carries load but barely changes shape, so a patch bonded to the liner beneath it lives a quiet life. The shoulder is a different object entirely. It is where the tread curves round towards the sidewall, where the edge of the steel belt finishes, and where every corner, every camber and every kerb makes the rubber bend and spring back. A patch there is being peeled at its edge thousands of times a mile.
It does not fail immediately, which is the trap. It holds for a few hundred miles, then weeps air at one corner of the patch, and by the time the tyre is opened again the liner around it has been fretted rough. That is why we would rather refuse a shoulder repair today than sell you the same tyre twice.
You are stood looking at a screw head in the tread and wondering whether to pull it out. We come to it, on Westwood Hill or on a driveway, take the wheel off and find out whether the damage is inside the repairable area. Level in Forest Hill, sloping in Sydenham: we set the car straight first. Underground parking in Crystal Palace or Bell Green is worth flagging. The SE26 postcode and a street in Crystal Palace: that is enough.
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Shoulder damage turns up more here than on flat ground, because the shoulder is the part of the tyre that meets a kerb. Streets parked to both sides with a real camber mean cars get pushed in tight against a kerb face several times a day, and the outer edge of the tread takes all of it. That is also the part where no repair is allowed.
A screw sitting exactly where the tread pattern begins to curve away. Measured across the tyre it fell outside the band by a matter of millimetres. Being shown that with a rule is easier to accept than being told it.
A tyre losing air slowly with a patch already inside it, fitted right out at the tread edge. One side had lifted and the liner beneath had chafed itself rough. There was no repairing it a second time and a replacement went on.
Described on the phone as being at the edge, which usually means a new tyre. With the wheel off it proved well within the central band. The driver had been judging against the tread pattern rather than the width of the tyre.
Within the middle three quarters of the tread width, measured across the tyre rather than judged by eye. The outer eighth on each side is out. That sounds generous until you look at a wide tyre, where an eighth is a good deal more rubber than it sounds.
Same reason as the shoulder, only more so. A sidewall does nothing but flex, several times a second, for the whole life of the tyre. No bond survives that and no standard anywhere permits it.
None, and the size of the hole is not the question. Where it sits is. A pinhole in the shoulder gets refused and a considerably larger injury in the middle of the tread gets repaired without a second thought.
You are told what size the car takes and what is on board before anything is decided. Common car, SUV and 4x4 fitments travel with us and go on balanced and torqued where the car stands.
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