A properly repaired tyre passes an MOT. There is no advisory attached to it, nothing recorded on the certificate and nothing you have to declare, provided the repair was done to the recognised standard and sits inside the permitted area. That surprises people, largely because the opposite gets repeated so often. What does fail is a repair that should never have been made in the first place: something plugged from outside, a patch out in the shoulder, or a repair sitting next to a bulge or a cut.
What an inspector actually looks at is not complicated. Tread depth across the central three quarters, the condition of both sidewalls, whether any casing is exposed, whether there is a lump or a tear, and whether the tyre is the right type and rating for the axle it is on. A sound repair does not appear anywhere on that list, because a sound repair changes none of it. So when somebody tells you a repair means an early replacement, it is fair to ask which of those things they think it affects. The answer is usually none of them.
A repair costs a small fraction of a tyre. That is the whole reason to have someone look properly rather than assume the worst. That happens on the drive in Pentonville Road, at work or at the roadside, whichever applies. The wheel comes off in Islington High Street, not on a ramp in Canonbury. Nothing is towed out of Pentonville Road or the Duncan Terrace area; the work finishes there. A N1 address in City Road basin and one in Upper Street are the same round.

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The streets off Upper Street and around Duncan Terrace are permit only and full by mid morning, so booking a car in anywhere means giving up a space you may not get back. That is the real cost of a garage visit around here, and it is why so many people put off dealing with a slow puncture until a test forces the issue. Since the car does not have to move for us, there is nothing left to put off.
A tyre patched in a bay off Upper Street went through its test a fortnight later without a mention. That is the ordinary outcome for a repair done properly.
A car near the City Road basin came to us after a failure. The tyre had a plug pushed in from outside and no patch behind it, which is precisely what an inspector is watching for.
A driver near Chapel Market wanted both fronts repaired before a test. One was repairable and one had damage in the shoulder, so one was patched and one was replaced.
Not if the repair was done to the recognised standard and sits inside the permitted area of the tread. A sound repair is not a defect and is not recorded as one. What fails is a repair that was never allowed to be made.
Tread depth across the central three quarters of the width, the condition of both sidewalls, whether any cord is exposed, whether there is a bulge or a tear, and whether the tyre matches the other one on its axle in type and rating.
No. It is worth knowing yourself, which is why repairs are marked, so anyone taking the tyre off later can see what is already in there. Beyond that it is an ordinary tyre with an ordinary tread life ahead of it.
That is often the sensible order. We come to the permit bay or the workplace, take the tyre off the wheel, and tell you honestly whether it is a repair or a replacement. Better to have that answer a week beforehand than on the morning.
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