An impact break is a specific thing and it is worth recognising. You hit a pothole edge hard, nothing seems wrong, and a few days later there is a small egg-shaped bulge on the sidewall. What happened is that the tyre was pinched between the road and the rim for an instant and a handful of cords snapped inside. The tyre held pressure the whole time, which is why it feels like nothing happened.
It has not. That bulge is the only part of the wall still holding, and it fails suddenly rather than gradually. Around Archway this is a familiar story, because the gyratory and the climb up Highgate Hill are patched and repatched, and a wheel dropping into a bad edge at speed is doing exactly the thing that causes it. We come out, take the wheel off, confirm whether it is an impact break or something harmless, and replace it if it is real. The rim gets checked at the same time.
An MOT advisory about a tyre is a warning with a date on it. We can look at the car where it sits, in Hargrave Park or Upper Holloway, and give you a straight view, then fit the replacement there and then if that is what it needs. The wheel comes off in Upper Holloway, not on a ramp in Hornsey. Nothing is towed out of Hargrave Park or St John's Way; the work finishes there.
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The A1 climbs through Archway towards Highgate and the surface takes constant punishment from the gradient and the traffic, so pothole strikes here are not rare events. The damage they do is delayed and invisible for the first few days, which is what makes it dangerous. Getting a suspect wall looked at while the car is parked on a quiet street off Hargrave Park is far better than finding out on the hill.
A driver hit a bad edge at the Archway gyratory and found a swelling three days later. Impact break confirmed, tyre replaced, rim checked and clear.
A car that took a heavy knock on Junction Road had a bulge on the inner wall where nobody looks. It was found on inspection and dealt with.
A wheel struck hard on Highgate Hill had both a damaged tyre and a rim out of true. Both were identified before anything new was fitted.
Cords snapping inside the sidewall when the tyre is pinched against the rim by a pothole. It shows up days later as a bulge, and the tyre never loses pressure in the meantime.
No. The structure has already failed and there is nothing to patch. It is one of the few things where the answer is a flat no with no room for argument.
Check the walls, inside and out, over the next few days. If a swelling appears, stop using it. If nothing appears, the tyre probably escaped.
Yes. A knock hard enough to break cords often bends the rim, and a buckled rim will not hold a seal properly however good the new tyre is.
Typical arrival is 30 to 60 minutes across Archway, whether the car is up near Whitehall Park or down at the foot of Highgate Hill.
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