Look along the sidewall for the letters XL, or the word Reinforced. If they are there, the tyre is built on a heavier casing than the standard version of the same size, with more plies underneath and a stiffer bead, and it carries a higher load rating on the understanding that you run the higher pressure that goes with it. That matters more to a repair than most people would guess, because a repair is a job done through the thickness of the tyre and this tyre is thicker.
The injury channel is longer, so it has to be cleaned and filled through its full depth rather than simply covered on the inside. A patch bonded over an unfilled channel looks finished and leaves a path for water down to the steel belts, and a belt that has started to corrode is quietly on its way to failing months later. Everything else holds exactly as it does on any other tyre: the damage must sit inside the central three quarters of the tread, both sidewalls must be sound, and the repair is done to BS AU 159 or it is not done. What XL changes is the care it needs and what happens if the tyre cannot be saved, because an XL tyre is replaced with an XL tyre and nothing else.
The can of sealant in the boot is a way of moving the car, not a repair. Ring us instead and the wheel comes off where the car is, on a driveway in Stockwell town or at the kerb, the tyre comes off the rim, and the damage is inspected from the inside. School run in Larkhall or 1am in the Clapham Road area, we answer the same. Christmas Day in South Lambeth, any day in Larkhall: the line is open.

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There are a lot of heavier cars parked around the estates in SW9, and a fair number of them are running reinforced casings without their owners knowing it. It is worth reading the sidewall once so you know what you have, because the answer changes the conversation if a tyre needs replacing rather than repairing. Since we come to the bay and take the wheel off there, you can read the marking yourself while it is in front of you rather than taking anybody's word for it over the phone.
An SUV came to us with one standard casing among three reinforced ones, fitted somewhere else at some point. It was the odd tyre out in every measurable way, including how much load it was rated to carry.
A nail through the crown of a reinforced tyre in a bay off Stockwell Road. The channel went through noticeably more material than a standard casing, and it was reamed and filled to its full depth before anything went on the liner.
A tyre repaired elsewhere came back with staining spreading from the old repair. Water had been getting past it for a season, and by then the argument was over.
Extra load. The casing is built up with additional plies and a stiffer construction so the tyre can carry more weight, and the higher load rating only applies at the higher pressure it was designed around. Plenty of SUVs and heavier family cars are fitted with them as standard from new.
The rules are identical and the workmanship has to be better. There is more material between the tread surface and the inner liner, so the channel is longer and has to be prepared and filled all the way through. Rushing that is how water reaches the steel and ruins a sound tyre later.
Not sensibly. It will bolt on and it will look right, and it will be rated to carry less than the car was approved for. If the car left the factory on reinforced tyres, that is the specification it keeps.
The central three quarters of the tread width, on a tyre that is otherwise sound. Damage in the shoulder or the sidewall is outside the repairable area no matter how neat it looks, and no amount of extra plies moves that boundary outward.
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