The rules for repairing a punctured tyre do not change with the size of the tyre, but the odds certainly do. BS AU 159 confines repairs to the central part of the tread, and everything beyond that band, out toward where the tread curves down into the sidewall, is off limits, because that is the region of a tyre that flexes hardest in service. On a tall, narrow tyre most punctures land comfortably inside the permitted area. On a wide low profile wrapped around a big wheel, the contact patch is short and broad, the shoulders make up a greater share of what actually meets the road, and a nail is simply more likely to arrive somewhere that cannot be patched.
There is also less to work with. Performance tyres are shallower when new than ordinary ones, so there is less rubber above the belt and less sound material around the hole for a patch to key into. None of that makes a repair impossible, and plenty of low profiles are repaired properly every week. What it does mean is that on a car wearing wide, short-sidewall tyres the honest answer comes back as replace noticeably more often than the driver expects, and that is much better heard before the wheel comes off than after.
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 Cromwell Road is also the least safe thing you will do that week. A Phillimore cul-de-sac or a Gloucester Road main road, tell us which. A tight terrace in Gloucester Road or a narrow bay on Cromwell Road is usually workable.
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Large wheels and short sidewalls are the norm on the cars parked along the streets off Kensington High Street, and the same kerbs that mark those wheels also push nails and glass into the outer part of the tread rather than the middle of it. That combination is why a straight repair goes ahead less often here than the drivers expect. It is not caution for its own sake. It is where the damage happens to sit, and the only place that can be judged properly is with the tyre off the wheel and the inner surface in front of a light.
A nail in a wide front tyre had landed just past the edge of the repairable area. Half an inch further in and it would have been a straightforward patch. There is no discretion available at that line and pretending otherwise helps nobody.
The same car had picked up damage on two wheels near the High Street. One was central and got repaired properly. The other was into the shoulder and was replaced, which is not inconsistency, it is where the objects happened to land.
A screw that looked central on the outside had travelled sideways through the rubber and come out well off to one side. That only becomes visible once the tyre is off the wheel and the inside can be seen.
Within the central section of the tread only. The area out toward the shoulders and the whole of the sidewall are excluded, because those parts flex constantly and a bonded repair works itself loose there. The standard is specific about it, and a repairer who ignores it is handing you a tyre that will let go later.
Partly geometry and partly material. The contact patch is wide and short, so proportionally more of what touches the road is shoulder rather than central tread, and a nail is more likely to land out there. And a performance tyre has less depth to begin with, which leaves less sound rubber around the hole to bond to.
A repair carried out to the standard, from inside, with the tyre off the wheel and the injury properly prepared, leaves the tyre serviceable and is marked as such. A plug pushed in from the outside is not a repair to any standard, and after one of those nothing about the tyre's original rating can be relied on.
Not honestly, no. What matters is where the object finished up inside the tyre rather than where it went in, and the two are often surprisingly far apart on a wide tyre. The tyre has to come off the wheel and be looked at from the inside, which is what we come out to do.
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