The legal position is narrower than most drivers realise. Tread depth is the bit everyone knows about: 1.6mm, held across the central three quarters and right the way round the tyre. What is less understood is that a tyre can be illegal with a full depth of tread on it.
A cut deep enough to reach the cords, a lump or bulge caused by the structure separating inside, and any ply showing through the rubber are each an offence on their own account, and each is a straightforward MOT failure. So the useful question about a damaged tyre is never how much tread is left. It is what the casing is doing. We take the wheel off, read the inner liner as well as the outer face, and give you a verdict rather than an impression. Around SE8 the bulk of what brings us out is kerb and pothole damage, because the surfaces near the railway and along the High Street get patched rather than rebuilt, and patches lift. A decent proportion of it turns out to be cosmetic, in which case the wheel goes straight back on and nothing is sold. When it is not cosmetic there is no middle course, because neither the regulations nor the standard makes any allowance for repairing a structure that has come apart.
Tyres on the same axle should be a matched pair, and one damaged tyre is where that goes wrong. The replacement itself is fitted and balanced where the car stands in SE8, with the alloy and pressure sensor checked as the wheel goes back on. The wheel comes off in Greenwich, not on a ramp in Bermondsey. Nothing is towed out of the Creek area or New Cross; the work finishes there. SE8 takes in Deptford and New Cross, and we work the lot.

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Heavy traffic on the A200 and Creek Road hammers the surface and the repairs never last a winter, so this postcode produces more impact damage than it does punctures. If you use those roads daily, the sidewalls are worth a proper look every few weeks, particularly the inner ones, which are the last place anybody thinks to check and the first place trouble shows.
The inside shoulder is the part nobody sees, and it is where a car with tired geometry wears through first. By the time cord is visible the tyre has been illegal for a while. Turn the steering onto full lock now and then and have a look.
A hard-edged hole taken at speed traps the tyre against the rim for an instant. That is long enough to break cords without leaving a mark you would notice at the time. The bulge shows up days later on a completely uneventful journey.
Plenty of people are surprised that a nearly new tyre with a gash in it is an offence. Depth and condition are assessed separately, and failing on condition is just as much a failure. It is also the version that fails suddenly rather than gradually.
In the main grooves across the middle of the tyre, in several places around it. Wear is rarely even, so one healthy reading proves very little on its own.
As a rough warning, yes. If the outer band of the coin disappears into the groove you are comfortably legal; if it does not, get it measured properly. It is a prompt to check, not a substitute for checking.
If the cracking has gone deep enough to expose the structure, yes, and the tester has to fail it. Surface crazing on its own should not fail, so ask which it was and get it shown to you.
Get a second opinion, and we will not be offended. We would rather you were confident about a tyre than take our word grudgingly. The one thing we will never do is put back something we believe to be unsafe.
Normally within the same visit. The verdict and the replacement happen in one trip, so you do not end up sitting on a car you have just been told not to drive.
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