The other pattern is impact. The A505 and the A1198 carry real speed, and a pothole or a broken edge taken at seventy pinches the sidewall against the rim and breaks cords inside the casing. Nothing shows at the time. The tyre holds air, the car drives normally, and a fortnight later there is a bulge on the sidewall that was not there before.
So a broken tyre is not really about how bad it looks. It is about whether the structure is intact. Grazes, scuffs and shallow crazing usually are. Bulges, splits, exposed cords and deep cuts are not, and no repair changes that.
Winter leaves the roads worse than it found them, and tyres pay for it in March. A wheel dropped into one on the B1039 can split a tyre from the inside without leaving a mark you would notice. Level in Bassingbourn, sloping in Melbourn Road: we set the car straight first. Underground parking in Burns Road or Newmarket Road is worth flagging.

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Royston sits on chalk and the flint that comes with it turns up on every lane out of town, so cuts rather than nail holes are the common form of damage here. They are worth taking seriously even when they look shallow, because depth is what matters and depth is hard to judge from above. A proper look takes a couple of minutes and settles it either way.
A car came off the lanes with a clean slice in the shoulder of a nearly new tyre. Flint had done it at low speed, which surprised the owner. Depth rather than speed is what counts, and this one had gone through to the belt.
A driver from Burns Road hit a sunken edge on the A10 and thought nothing more about it. A fortnight later the sidewall carried a soft lump the size of an egg. That is an impact break appearing on its own schedule rather than yours.
A car on Melbourn Road had the inner shoulders worn away on both fronts while the outer tread still looked new. The tyres were replaced, but alignment was the reason, and saying so saved the owner doing the whole thing again in six months.
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I clipped the kerb when parking, damaging the wall of my tyre. I contacted Fast Tyre at 21:37 and by 23:40 I had a new tyre fitted. Excellent service and both boys were friendly and efficient.
Came and sorted a replacement tire within half an hour or so. Fast and efficient service.
Just been helped by Abdul. The best customer service experience ever. He went far above and beyond what we expected. An example for everyone to follow.
Effectively yes. Both areas flex constantly and neither will hold a repair. A cut there is judged on depth: if it has reached the belts or lets water in, the tyre is finished whatever the tread depth happens to be.
It can be immediate or it can take weeks. An impact break is a bruise inside the casing that opens gradually under load, so a tyre can drive perfectly for a fortnight and then bulge. If you took a real hit, get it looked at.
No. A bulge is cords that have parted, and nothing puts them back. It only grows, and it fails suddenly rather than slowly, which is why the tyre should come off before the car does another long run on the A505.
Yes. Plenty of the inspections we do end with us saying the tyre is fine. We would far rather do that than have somebody replace a serviceable tyre because a kerb scuff looked alarming in the daylight.
Shallow ones are normal, especially on a car that stands outside through a few winters. Cracks deep enough to catch a fingernail, or running around the bead, mean the rubber is perishing and the tyre is near the end.
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