A patch put on in the wrong place does not leak. That is what makes it dangerous. It holds air perfectly well for months while the rubber around it is worked far harder than any repair was designed for, and then it goes all at once, with no soft tyre and no warning in between.
The reason is where the flexing happens. The central tread sits on a stiff belt package and barely moves as the tyre rolls. The shoulder and the sidewall move constantly, bending in and out several hundred times a minute. A patch bonded into that zone is peeled at its edges on every revolution, and rubber that is peeled eventually lets go. The hole underneath is then open, and the tyre empties in a second or two at whatever speed you were doing.
We find these on second hand cars far more often than on cars whose owners cut corners. Nobody mentions at the point of sale that one tyre carries a patch on its shoulder. If a tyre has failed and there is a neat round patch inside the wreckage, that is very likely your answer.
Recovery is the wrong tool for a burst tyre. We finish the job instead: one call, a technician on the way to your exact location in SE5, replacement stock already in the van, and a live ETA so the wait has a number on it. Old tyres leave Myatt's Fields, Loughborough Junction and SE5 with us, every time. You watch it happen in Walworth, or at the kerb in Denmark Hill.

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Denmark Hill is a real climb and the traffic on it moves in surges, so a tyre that fails there fails under load rather than while coasting. There is nowhere sensible to stop on the hill and the side streets are parked solid. Wherever you have pulled in, the replacement comes to you, so the only journey the car makes is the one it was already making.
A front tyre let go on the climb with no impact and nothing in the road. Inside the remains sat a patch half on the shoulder with its edges lifted all the way round. The car had been bought that spring.
A tyre off a car near Camberwell Green had been patched twice within a couple of inches. Both sat in the tread, lawful enough on its own, but injuries that close weaken the same area and neither should have gone in.
While fitting the replacement we looked at the other three. The rear carried a shoulder repair in the same style and by the same hand. It came off that afternoon rather than waiting to do the same thing.
From outside, no. A correctly bonded patch is invisible from the road side of the tyre and a badly placed one looks no different. The only sign anyone reliably gets is a tyre wanting a little air more often than its neighbours.
Only with the tyre off the rim, so it is worth asking at the next puncture or tyre change rather than making a special trip. Whenever a wheel is off for any reason the liner gets looked at, and an old repair is obvious.
No. BS AU 159 draws the repairable area across the middle of the tread and stops there, and the reason is the flexing rather than paperwork. We turn repairs down on that boundary regularly and fit a tyre instead.
It usually survives if you stop promptly and usually does not if you carry on. The rim edge takes the whole load the moment the tyre is flat, and a few hundred metres flattens a section of the lip so the bead will not seal.
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