The legal minimum in this country is 1.6mm of tread depth, and it applies across the central three quarters of the tread width, all the way round the tyre. Those two qualifications are where most people come unstuck. A tyre is not legal because the middle of it measures well. It is legal only if the shallowest point inside that central band, anywhere around the wheel, still has 1.6mm left on it.
That distinction decides a lot of jobs. Cars whose alignment is slightly out wear a narrow strip on one edge of the tread while the rest looks healthy, and if that strip falls inside the central three quarters, the tyre is already illegal even though four fifths of it is fine. The second trap is measuring in one place. Tyres wear unevenly around their circumference, particularly if a wheel has ever locked up, so a gauge put in three or four spots tells a very different story from a gauge put in one. We measure properly and show you the readings before anything is decided.
An unusual size is worth mentioning early rather than late. Once it is settled, it is fitted and balanced where the car is parked in Letchworth Garden City, with the valve checked and the pressures set to the manufacturer figure. The A6, the A1(M) and the streets around Garden Square sit inside Hertfordshire. The wheel comes off in Grange, not on a ramp in Stevenage. Nothing is towed out of Norton or Pixmore; the work finishes there.
Emergency tyre replacement in Letchworth Garden City is part of our wider mobile 24-hour emergency callout cover. For emergency tyre replacement in Letchworth Garden City, call 07717 389637 or ask us for a quote.
A car that spends its life on the broad roads around Pixmore and only meets fast traffic joining the A1(M) at Junction 9 wears its tyres slowly and unevenly. That combination is exactly how a set reaches the limit on one narrow band without anyone noticing. Measuring where it genuinely matters takes moments on your own driveway.
A car on a Grange driveway measured comfortably in the centre grooves. Move the gauge inboard and the depth fell away to nothing while still well inside the three quarter band. Alignment had been quietly eating one strip for months.
The same tyre gave four separate depths at four points around the wheel. The lowest of those is what counts, not the average, and the lowest was under the limit. We walked the owner round the other three with the gauge before packing up.
Moulded bars sit in the bottom of the main grooves at the legal depth. When the tread wears level with them the argument is finished. On this car they were flush across two tyres and the driver had been planning to leave it until spring.
It is a rough screen rather than a measurement. The border of a 20p sits a little above the legal depth, so it tells you whether to worry. It will not give you the actual figure, and it will not find the worn strip you never thought to test.
The rule allows the outer edges to wear more, because they take cornering loads the middle never sees. What it does not allow is any point inside that central band dropping below the limit anywhere around the tyre.
That is the point of coming to you. Common sizes travel with us, read off the code on the sidewall when you ring, so the usual outcome is one visit with the tyre fitted and balanced at the car.
It matters to your insurer and to your stopping distance in the wet, which are two separate problems that tend to arrive on the same day. Tread depth is almost entirely about clearing water, and that ability falls away sharply near the limit.
Most people do, and there is good reason for it. Wet grip drops off well before 1.6mm. We will tell you what you have got and let you pick the timing rather than manufacturing an emergency out of a tyre with months left in it.
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