A tyre that lets go without hitting anything has usually run out of two things at once. The first is rubber. The legal minimum of 1.6mm across the central three quarters of the tread is a floor, not a target, and a tyre sitting on that figure has almost nothing left between the road surface and the steel belts holding it together. A sharp stone that would have lodged harmlessly in a deep groove reaches the belt instead.
The second is the ability to shed heat. A tyre warms up by flexing, and a tyre that is a few pounds down flexes considerably more than it should, so the casing runs hotter mile after mile. Heat is what attacks the bonds between the layers, and a worn tyre is very often a tyre that has been quietly soft for months, because nobody checks the pressures on a car that only does short journeys. Put a warm day and a sustained run on top of that and the crown can simply part. It explains something people find strange after the event: these failures nearly always happen on the fastest road anybody has driven that week rather than on the street outside the house. On the A3 Kennington Park Road, running hard toward the Elephant, that is not a comfortable place to find out.
A 4x4 or a big SUV makes a blowout harder rather than easier. We carry proper equipment for exactly that and stock in the larger sizes, so the wheel comes off safely, the replacement goes on and it is balanced where the car is stopped, in The Oval or anywhere else you have managed to pull up. The wheel comes off in the Cleaver Square area, not on a ramp in Vauxhall. Nothing is towed out of The Oval or Vauxhall; the work finishes there.

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A great many cars in SE11 do modest mileage, sitting on a permit bay near Cleaver Square all week and going out for one proper run at the weekend. That is exactly the pattern this failure likes, because tyres wear slowly, get checked rarely and then meet real speed and real heat in a single afternoon. If the car mainly does short trips, the tread depth and the pressures deserve a look before a long journey rather than after one.
A tyre measured a shade over the limit in the centre groove and well under it at the outer edge. Depth is not one number, and the car had been passing its own owner's eyeball test for months.
A car used for short local runs had been a few pounds down since the cold weather. Nothing happened at all until a long warm drive gave the casing the heat it needed.
A driver replaced one worn tyre after a failure and we measured the other while the wheel was off. It was in the same condition and had done the same miles at the same pressure.
It is legal and it is nearly finished. Wet braking and standing water performance fall away long before the tread reaches that figure, and a tyre that thin has very little material protecting the belts underneath. Treat it as the point you must have replaced it by, rather than the point at which to start thinking.
Because heat is half of the cause. A soft or worn tyre flexes more, generates more heat and struggles to lose it when the road surface is already hot. Add a longer, faster run than the car normally does and you have every ingredient at once.
Only if the rest of the width agrees. Depth has to be measured in several places across the tread and around the circumference, because tyres wear unevenly. The worst reading is the one that decides, not the one that flatters the tyre.
Keep hold of the wheel with both hands, do not brake hard, and do not try to steer against the pull. Ease off and let the car slow itself, then move to the nearside as the speed drops and get well clear of the traffic before you make any calls.
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