You are hosing down the car on a Saturday, you get to the front nearside, and there is a smooth swelling in the sidewall about the size of an egg. Nobody remembers hitting anything. That is how a good many of them start. A bulge means the cords inside have broken and the shape is being held out by pressure alone, which is why the tyre must come off the car rather than be watched for a few weeks. Other damage is far less serious than it looks, and we will tell you which you have got.
Most damaged tyres are not dramatic. They come from a kerb taken slightly too fast on the A428, a pothole nobody saw, or a bulge noticed while walking back to the car in Upper Cambourne. Nothing is towed out of Sheepfold Lane or Monkfield; the work finishes there. Pressures set before we leave Monkfield, and the same on the A1198.

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Newer estate roads across Cambourne still shed screws and grit from ongoing building, and the kerbs are square and unforgiving on a tight turn. Most damage we are called to here came from the road rather than a nail, and we come to the drive to look at it properly.
A raised, soft area on a tyre with plenty of tread left and no story attached to it. Impact damage does that, sometimes weeks after the pothole responsible. It was replaced on the driveway that morning rather than taken onto a fast road to find out.
A gash across the tread picked up somewhere on the newer estate roads, deep enough to show cord. A cut through the casing is not a puncture and cannot be patched. The tyre came off and a matching one went on in its place.
A second car near Sheepfold Lane that barely moved had healthy tread and cracked sidewall shoulders. Age hardens rubber regardless of mileage. With the A14 in its future, replacing the pair was the sensible advice.
No. That is the one piece of advice on here we would not soften. The tyre can fail without warning and the fast roads out of the village are precisely where it would happen. Leave the car and let somebody come to it.
Usually a pothole or a kerb hit that felt like nothing at the time. The cords break inside, the swelling appears days or weeks later, and by then the connection has been forgotten.
Rarely. Stones sit in the grooves and fall out. What matters is whether anything has gone through into the casing, and whether it is losing air. If the pressure holds for a week, it is almost certainly just a stone.
We look, yes. A hard kerb strike can flatten the rim lip and leak air past the bead, and there is no point fitting a new tyre onto a wheel that will not seal. If that is what is going on, you will hear it.
Yes, and it happens often. There is nothing to gain from selling somebody a tyre they do not need, and the reviews behind our 4.9 star rating say more about those visits than about the big bills.
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