A plug is a strip of sticky rubber pushed into a puncture from the outside, usually without the tyre ever leaving the rim. It seals for a while. It never bonds to the inner liner, and it does nothing about the cords the nail cut on the way through. Months later it works its way back out under heat and flexing, and a tyre that was mended is flat again.
A fair share of our damage calls in E10 turn out to be exactly that. When a plug tail is sitting proud of the tread, the wheel comes off and the tyre comes off the rim, because the inside of the casing is where the truth is. A proper repair looks nothing like it. A combined plug and patch is a mushroom shape fitted from within, the stem filling the reamed hole and the patch sealing the inner liner around it. If the cords have been chafing around a bad plug all winter, there is no repair left to do, and you get told that with the tyre in your hand.
A bulge in a sidewall is a tyre telling you the casing has already failed. What we can do is come to Leyton, confirm what you are looking at, and fit the correct replacement on the spot, whether the car is on a driveway in Temple Mills or parked up in Leyton Midland. Old tyres leave Temple Mills, Francis Road and E10 with us, every time. You watch it happen in Francis Road, or at the kerb in Bakers Arms.

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Bad repairs travel. A tyre plugged in a hurry somewhere else will usually fail on a road you did not choose, and the A12 alongside E10 has no verge worth stopping on. Most of the damage jobs we attend here happen where the car is already parked, which is the cheap version of finding out. We come to the kerb and take the tyre off the rim there.
A driver near the Bakers Arms had a slow leak mended somewhere cheap in the spring and lost the same tyre again in July. The plug tail had backed out far enough to catch a fingernail. Inside, the liner was blistered all round the hole, so it was replaced.
Both rear tyres on the same car had been punctured within a fortnight. One carried a patch bonded properly to the liner and was left exactly as it was. The other had a plug pushed in from outside and was already weeping air past it, so only that one changed.
A screw had sat in the tread of a car parked off Francis Road long enough for the hole to wallow out around it. There was nothing tight left for a stem to grip. We showed the owner the inside of the casing and fitted a new tyre.
It seals the tread but leaves the inner liner open, so air keeps creeping into the casing where you cannot see it. The rubber between the belts then separates quietly for months. A patch bonded to the liner from inside is what stops that happening.
From outside you usually cannot. A stem trimmed flush looks much the same either way. The only honest check is to break the tyre off the rim and look at the liner, which is part of what happens when we come out.
Not on a structural fault. Tread depth tells you about grip in the wet, and the 1.6mm legal minimum across the central three quarters is about exactly that. It says nothing at all about whether the cords underneath are still doing their job.
Sometimes, but not just anywhere. BS AU 159 limits how many repairs a casing may carry and how close together they may sit, and both limits exist because each repair takes a bite out of the belt. The whole liner gets checked before a second one is agreed.
Only if the other one needs it. Where its partner has decent depth, a sound casing and a similar age, one tyre is a perfectly reasonable answer, and you will hear that rather than be talked into a pair.
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