An impact break is the damage that catches people out, because the event and the symptom are weeks apart. You hit a pothole hard, or drop a wheel off a kerb at an angle, and in that instant the sidewall is crushed between the rim and the obstruction. Nothing appears. The tyre holds air, the car drives normally, and the whole thing is forgotten. Then a lump the size of half an egg appears on the sidewall on an ordinary Tuesday and nobody can think what caused it.
What happened was that a band of cords inside the sidewall snapped at the moment of impact, and the air behind them has been slowly pushing the rubber outwards ever since. Once you can see it, the tyre is finished. There is no repair for it, it will not settle back, and it gives no warning at all before it lets go.
Kerbing an alloy near Walthamstow Market or dropping a wheel into a pothole on the North Circular does not always announce itself. The tyre holds air, the car drives, and the damage only shows when you crouch down and look: a gouge, a split, a bulge sitting proud of the sidewall. Nothing is towed out of Highams Park or Wood Street; the work finishes there. Pressures set before we leave St James Street, and the same on Hoe Street.

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Forest Road and Lea Bridge Road take a constant beating from heavy vehicles and the surface shows it, which is where most of the impact damage we see in E17 comes from. The useful habit after a hard knock is to look at the sidewall the following morning in daylight. A broken cord announces itself then, not while you are still driving.
It did not appear out of nowhere, it was made weeks ago by something you have forgotten. The tyre is scrap the moment the bulge is visible, and no inspection makes that verdict any softer.
The old streets around Walthamstow Village have unforgiving kerbs and cars squeeze in tight. If you felt the wheel land badly, look along the whole sidewall in daylight the next day rather than at night under a streetlight.
A scrape on the alloy means the tyre was trapped between metal and concrete at the same moment. The wheel is harder than the rubber, so if the rim took a mark it is worth pulling the tyre and reading the inside of the casing.
No. What has failed is the structure the tyre is built around, and there is nothing to patch. Any repair that existed would be sticking rubber over broken steel and fabric.
Treat it as no distance. It might last a fortnight or it might not last the run down to the North Circular, and nothing about the tyre will tell you which of those you have.
Depth and condition are two different tests and a tyre has to pass both. You can have 7mm of tread and a broken sidewall, and the tyre is still finished.
Describe it to us first and we can often place it without anyone travelling. If we do come and the tyre turns out to be sound, we say so and fit nothing.
Not automatically. If its partner across the axle is in reasonable condition, one goes on. We will tell you honestly if the pair is badly mismatched rather than push the larger sale.
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