A tyre is not one material, it is several bonded together: a steel belt package, a textile casing and rubber moulded over the top. Those bonds are the tyre. When one of them lets go at the shoulder, where the tread meets the sidewall, the tread begins lifting away from the belt underneath while the wheel is still turning. That is a separation, and it usually announces itself as a vibration or a rhythmic thumping that builds over days rather than as a bang.
What ends it is centrifugal force. Above a certain speed the loosened section is being flung outward harder than the remaining bond can hold, and the tread peels off in a strip, taking the tyre with it. Which is why a new thump through the floor or the steering is worth investigating rather than living with. It is also why nobody can repair one: the failure is in the bonds between layers, and there is no way to glue the inside of a tyre back to itself. If it goes while you are moving, hold the wheel straight, lift off gently, let the speed fall away, and get off the road before thinking about anything else.
The clock is the difference between an hour lost and a day lost. We do the second, across EC1M, with a live ETA so the wait is a known quantity. That includes on Farringdon Road, where sitting still is the last thing you want to be doing. School run in Charterhouse Street or 1am in Smithfield, we answer the same. Christmas Day in Smithfield, any day in Charterhouse Square: the line is open. The EC1M postcode and a street in Hatton Garden: that is enough.

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Farringdon traffic is slow, and slow traffic hides this particular problem, because a separation that would announce itself at speed just feels like a rough surface when you are crawling along Charterhouse Street. Then the car goes out on something fast and the loosened section finally lets go. If you have picked up a new thumping noise while doing local mileage, it is worth having the wheels off before the next long run rather than after it.
A driver had been hearing a rhythmic noise for days before the tread lifted on a fast road. The separation had been showing as a slight distortion in the shoulder the whole time.
A wheel off in a permit bay near Charterhouse Square showed a shoulder that was no longer flat where the tread met the sidewall. That tyre was replaced rather than repaired.
A separation on a car pulled in off Farringdon Road took the tread away and marked the inner arch on the way out. The tyre was replaced and the wheel checked.
Usually a vibration or a regular thumping that rises with road speed rather than engine speed, and it tends to get worse over days. Anything newly arrived and getting louder is worth having looked at rather than waiting to see what it does.
No. The failure is in the bond between the tyre's layers and there is no way to reattach them. A tyre showing separation gets replaced. The value of catching it early is that it gets replaced on a driveway rather than at the side of a fast road.
Age, heat, long periods run under inflated, an old repair that let water in, or a manufacturing fault. Running a tyre hot and soft is the most common of those, because heat is exactly what attacks the bonds between layers.
The common car, SUV and 4x4 sizes travel on the van, so most roadside failures around EC1M and EC1A finish on the first visit. Anything unusual we tell you about when you call rather than after we have arrived.
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