The sticky rope you can buy in a tin, pushed into a hole from the outside with a needle, is the thing we get asked about most and the thing we will not do. It is not a repair recognised by BS AU 159 and it never has been. The reason is not snobbery about the material. It is that the entire procedure happens from the wrong side of the tyre.
A legal repair begins with the tyre coming off the rim, because the only way to know whether a tyre can be repaired is to look at the inside of it. You are checking the inner liner for the scuffing that says it has been run flat, checking the casing around the hole, and confirming the object went where you thought it went. A string pushed in from outside skips all of that. It seals the hole well enough to hold air, which is exactly the problem, because it makes a tyre that may be structurally finished feel completely normal. Every one we take out has been holding pressure for months. That was never the question being asked.
The space saver in the boot is the reason people drive on a flat, which is a shame, because it is not much of a solution either. Changing to it at the roadside on Whitton Avenue West is also the least safe thing you will do that week. Tight in Perivale, easy in Ravenor Park: neither stops the job. Level in Ravenor Park, sloping in the Westway industrial area: we set the car straight first. UB6 takes in the Westway industrial area and Sudbury Hill, and we work the lot.

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The estates around Perivale and the Westway industrial area produce a steady supply of screws and nails, and plenty of them end up in tyres belonging to people who have neither the time nor the inclination to lose a morning at a garage. That is the appeal of the tin of string, and it is why we pull so many of them out. Doing it properly costs about the same amount of your time, because we come to the yard or the driveway and the car never moves.
A car bought secondhand near Greenford Green had a string plug in a rear tyre. With the tyre off the rim the liner showed it had been driven flat before the plug went in. The tyre was scrap and had been for a long time.
A nail picked up on Oldfield Lane had gone in square and in the middle of the tread. Tyre off the wheel, inside inspected, patched from within, rebalanced, all of it on the drive.
A driver had been told a repair was impossible. It was a straightforward one, well inside the repairable band, and it was patched rather than replaced.
Because it goes in without the tyre coming off the wheel, so nobody has seen the inside. The standard exists to make sure the casing is sound before anything is sealed, and a plug seals first and asks nothing.
Holding air is not the same as being sound. A tyre that has been run flat carries damage to the liner and the casing that no amount of holding pressure reveals. Air tightness was never the test being applied.
The tyre comes off the rim, the inside is inspected, the hole is cleaned out and probed, and a combined stem and patch goes in from the inside so both the hole and the liner are sealed. Then the wheel is rebalanced and torqued back on.
Yes. Everything needed to break a tyre off a rim, repair it properly and balance the wheel travels on the van, which is the whole reason the car does not need to go anywhere.
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