A bulge in a sidewall is the closest thing to advance notice that a burst ever gives. It is a small dome, sometimes no wider than a thumbnail, and it appears where the cords inside the casing have snapped, usually after a kerb or a square edged hole taken at the wrong angle. Those cords are the structure of the tyre. The rubber over them keeps the weather out and holds the air in, and on its own it cannot contain the pressure sitting behind it. So where they are broken, the rubber stretches, and what you are looking at is a tyre that has begun to give up.
It does not stabilise and it does not heal. Every mile puts the load the failed area used to carry onto the cords at its edges, they stretch in turn, and the damaged patch spreads outwards. The end of that process is not a slow deflation. Which is why a bulge is a stop now problem rather than a book it in for Saturday problem, and why it is worth crouching beside each wheel occasionally instead of glancing at the tread on your way past. We come to the car, and if there is a lump in a sidewall we would much rather it did not travel to us.
Recovery is the wrong tool for a burst tyre. It is a long wait, it takes the car somewhere you did not want it, and at the end of it the tyre still is not fitted. Nobody should be driving on a shredded tyre to make that easier, least of all along Pitfield Street. Old tyres leave Whitmore Estate, Pitfield Street and N1 with us, every time. You watch it happen in Pitfield Street, or at the kerb in Kingsland Road.

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Hoxton Street and the roads around the Whitmore Estate are full of the things that break cords: raised tables, patched surfaces, tight bays with high kerbs, and cars parked so close that you end up taking an angle you would rather not. None of it happens fast enough to feel dramatic, which is why nobody connects the thump on Tuesday with the lump that appears on Thursday. The habit worth having is a slow walk round the car once a month, low enough to see the bottom of each sidewall, including the faces that point inwards.
A driver was checking the tread before a long trip and found something the tread had nothing to do with: a swelling low on the outer sidewall of a front tyre. The car had been driven on it for at least a fortnight.
One wheel down hard on a raised table, the other side barely touching, and all the load through a single corner for an instant. The bulge showed up two days afterwards, which is roughly the usual gap between the cause and the symptom.
The tyre we had come out for was on the nearside front. The one nobody had seen was on the inner sidewall of a rear, which faces the middle of the car and never gets looked at unless somebody is already down there for another reason.
We would rather you did not. Nothing about a bulge gets safer at lower speed, because the damage is a failed structure holding pressure, and it tends to go without any further warning. If the car is parked somewhere we can reach, leave it there and we come to it instead.
No, twice over. The cords in that area are broken and nothing rejoins a broken cord, and the sidewall sits outside the part of a tyre that a repair is permitted in anyway. There is no version of that tyre that goes back into service.
Almost always an impact rather than a slow decline. A kerb caught at an angle, a pothole with a hard edge, a raised bump taken with one wheel. The tyre is pinched hard for a fraction of a second, some cords break, and the bulge appears anywhere from immediately to a fortnight later.
Yes, as long as we can get near enough to reach the wheel. Bays on the estates round here are tight and often double parked, so tell us where the car is standing and what is either side of it, and we will work out the access before setting off rather than after arriving.
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