A bulge in a sidewall is not a lump of rubber. It is air, sitting in a pocket where the casing cords used to be. The tyre was pinched between the edge of a hole and the rim, the cords snapped in that instant, and all that holds the shape now is the liner. It does not settle down and it does not heal. It grows, and it tends to let go at the worst moment: hot tyre, loaded car, long run.
The awkward part is where they turn up. Most impact breaks sit on the inner sidewall, the face nobody ever looks at. A torch under the arch and a hand run round the inside of the tyre finds one in seconds, and it is worth doing after any hit hard enough to make you wince. Not every mark is a condemned tyre, though. Rubber scrubbed off the outer shoulder is usually cosmetic, and where that is all it is, we say so.
Sidewall damage is the one that catches people out. A kerb taken badly on Walton Bridge Road will do it as readily as a pothole will. If that is what you are looking at, whether the car is in Charlton or anywhere else in Shepperton, the answer is a replacement, and it is better fitted where the car is standing than at the end of a nervous drive. Ring at 3am from Lower Halliford and someone answers; Littleton at noon is no different. A 4am Lower Halliford call and a noon Littleton call reach the same fitter.

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Winter is the season for these round here. Water standing on a patched road surface freezes, lifts the top and leaves an edge, and the residential streets through Lower Halliford and Charlton collect them faster than they get filled. You feel the bang, you carry on, and the damage waits quietly on the side of the tyre you never see until somebody looks.
A driver who felt a bang the day before let us look at the car on the drive. The outside was spotless. The inner sidewall had a bubble the size of a thumb, and the tyre was scrap from that moment.
Impact breaks do not need drama. A sunken drain edge taken at thirty in a car with low profile tyres is plenty, and often the noise is the only clue you get.
Grey rubber rubbed off the outer shoulder looks alarming and usually is not. We checked the depth of it, found nothing into the casing, and told the owner to keep her money.
No. There is nothing left to repair to. The strength of a tyre is in the cords, and once they are broken no patch, plug or filler puts them back. Anybody offering to fix one is offering you something that does not exist.
Treat it as no distance. If the car has to move at all, move it at walking pace to somewhere safe and stop. Heat and speed are what turn a bulge into a blowout, and the car is far easier to deal with parked.
It can. A hard enough hit can buckle the rim, knock the tracking out or tire a shock absorber, and a buckled rim shows up as a steady vibration once the new tyre is on. We check the wheel while it is off and tell you what we find.
Then it is fine and we say so. Plenty of the marks people worry about are surface scuffing that has not reached anything structural. It is a better outcome for you and it costs you nothing in credibility with us.
It leaves with us. The old one goes on the van and is disposed of properly, so you are not left with a scrap tyre leaning against the garage wall waiting for a tip run.
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