The legal minimum in this country is 1.6mm across the central three quarters of the tread, and that is the point at which you are breaking the law rather than the point at which a tyre stops being any good. The useful figure is 3mm, and the reason is water. A groove is a channel for moving water out from under the tyre, and how much it can move depends on how deep it is. At 3mm a groove still shifts a serious volume. Down at the legal line it moves a fraction of what it did when new, so on a wet road the tyre starts to float at a considerably lower speed than the driver is expecting.
Buying at 3mm also puts you in charge of the transaction. You pick the brand, you pick the day, the tyres go on while the car is standing where it already lives, and you are not accepting whatever happens to be in stock because the car has to be legal by Friday. That is the practical difference between a planned purchase and a forced one, and the planned version tends to be the cheaper of the two as well as the calmer.
Two things have to be true for a tyre change to be painless. The first is that you chose the tyre rather than took what was in stock. Car parks, driveways in Little Venice and kerbsides are all the same job to us. Whether it is Maida Vale in rush hour or Warwick Avenue at midnight, we answer. On Sutherland Avenue, day or night, Elgin Avenue included, arrival across W9 runs 30 to 60 minutes. The W9 postcode and a street in Sutherland Avenue: that is enough.

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Cars in this part of Westminster tend to cover very little mileage and sit in the same residents' bay for days at a stretch, which means a set of tyres can take years to wear out and can spend a long while near the bottom of its useful range on the way. Age creeps in alongside the wear. Checking the depth twice a year rather than waiting for a test to raise it keeps the decision where it belongs, and since the fitting happens beside the car, planning it costs you nothing beyond choosing a morning.
A driver replaced a set at just over 3mm ahead of the winter rather than waiting for spring. The choice of tyre was entirely theirs, the fitting happened on a morning that suited, and no part of it was urgent.
A car with tread close to the minimum felt perfectly fine in the dry and distinctly vague in standing water. Nothing was wrong with those tyres beyond depth, which is exactly the point at which depth becomes the fault.
A tyre with plenty left in the outer grooves measured well down in the inner ones. The shallowest groove is the one that governs the decision, and only measuring in several places ever finds that.
Because almost all of the difference between the two is wet braking and resistance to standing water. Grooves half as deep move roughly half as much water, and stopping distances in the rain lengthen well before the tread reaches the limit. The legal figure is where enforcement begins, not where performance ends.
A depth gauge is best and they cost very little. Measure in the main grooves in several places round the tyre and across its width rather than in a single spot, then take the lowest reading you find. Tyres rarely wear evenly, and it is the worst groove that decides the answer.
Before the wet half of the year rather than during it, and while you still have a choice about it. Tread that copes through a dry summer is the same tread struggling in November, so early autumn is the natural moment to plan a set, when nothing is forcing your hand.
That is the usual arrangement around here. Tell us where the car sits and roughly what time suits, and the tyres are fitted and balanced in the bay with the car never moving. Payment is by card or contactless once it is done, and the old tyres leave with us.
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