The law wants 1.6mm of tread across the central three quarters of a tyre, right the way round. That is the figure everybody quotes, and it is worth being clear about what it leaves out. It says nothing about a swelling in the sidewall, nothing about a cut down into the cords, and nothing about rubber gone hard and crazed with age. A tyre can clear the tread requirement easily and still be unfit to drive on.
A good deal of what we get asked to assess round here falls into that second group. Surfaces that carry constant heavy traffic break up along their edges, and a car parked tight against a broken kerb in a permit street collects damage over months rather than in one dramatic moment. We come and look at it properly, off the car if that is what a real verdict takes, and then we tell you what is actually there. If the tyre is sound you will hear that as well, and no reason will be invented to sell you a new one.
Somebody usually points it out before you notice it yourself. A neighbour, a colleague in the car park, a passer-by who saw the bulge as you pulled in in Craven Park. We come to the car, confirm it, and fit the correct replacement where it is parked, on Craven Park Road or on a driveway, balanced and pressure-set before we leave. The wheel comes off in Craven Park, not on a ramp in Willesden. Pressures set before we leave Stonebridge, and the same on Harrow Road.

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Kerb strikes, broken road edges and the general battering that NW10 surfaces take mean damage assessment is a large part of what we do locally. We will reach the vehicle wherever it has ended up, pull the wheel off when a real answer demands it, and tell you straight instead of guessing.
The owner was certain it had not been there the day before. It probably had, but small. Broken cords under the rubber, no repair possible, and a tyre that could have let go at speed. Changed the same afternoon.
Regular parking against a broken kerb edge had been slicing at the same spot for months. From the kerbside there was nothing whatever to see. Turn the wheel round and the inner face told a completely different story, and it was replaced.
Deep scuffing on an alloy after a tight manoeuvre near the High Street. The tyre itself was undamaged, inside and out. We said so and left, because it was true and because saying otherwise would have been the easy sale.
It comes off the road. That bulge marks where the internal structure has failed, and there is no repair for it at any price.
Sometimes instantly, sometimes weeks later when a weakened area finally gives. That is why a hard impact is worth having looked at rather than forgotten about.
It does. Rubber hardens with time and stops gripping properly in the wet, and cracking along the sidewall is the visible sign of it. Age and depth are separate questions.
It can narrow it down and it is worth sending one. A proper answer still needs somebody looking at both faces of the tyre, which usually means taking the wheel off.
Frequently. There is no future in selling somebody a tyre they did not need, and word travels fast around here.
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