Some pothole damage announces itself as a bulge, and some of it produces a split that runs the wrong way. A cut that runs across the tread, from one groove to the next, is one thing. A split that runs around the tyre, following the line of the circumference in the shoulder or low on the sidewall, is quite another, because it is a tear along the direction of the cords rather than across them. Those are almost always impact damage, and they open up under load and close again when the wheel comes off, which is exactly why they get missed.
The lanes around here are the right environment for it: narrow, hedge lined, and hiding potholes that you meet at speed because there is nothing to warn you. So a damage call after a hard bang on a road out towards Loudwater or Maple Cross gets the sidewall and the shoulder examined with the car back down on its wheels as well as with it lifted. A tyre that looks perfect on the jack can show a fine circumferential line the moment the weight goes back on it.
Most damaged tyres are not dramatic. They come from a kerb taken slightly too fast on the A4145, a pothole nobody saw, or a bulge noticed while walking back to the car in Croxley Green. The wheel comes off in Croxley Green, not on a ramp in Chorleywood. Nothing is towed out of Moor Park or Maple Cross; the work finishes there.

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The lanes running out towards Chorleywood and the villages hide potholes that you find at speed, and the damage they cause does not always look like the bulge people expect. A split running around the tyre is easy to miss and just as final. It gets looked for with the car loaded as well as lifted, wherever it is parked, and if nothing has failed you keep the tyre.
A tyre off a car near Maple Cross looked sound with the wheel up in the air. Back on the ground, a fine line opened along the lower sidewall.
A driver from West Hyde hit a hole they never saw. The tyre held air and had a split running with the circumference, which is impact damage rather than wear.
A hard hit near Croxley Green produced no damage at all once both walls and the bead had been checked. The tyre went back on and nothing was spent.
Direction, mostly. A cut across the tread is usually road debris. A split running around the tyre is a tear along the cords, and that is impact damage.
Because it closes when the load comes off. It opens again when the weight is back on the tyre, which is why both states get checked.
No. Nothing in the sidewall or shoulder can be repaired, and a split along the cords is a structural failure rather than a hole.
Not necessarily, but it is worth having both walls looked at, particularly if the car has felt different since. Damage from an impact often takes weeks to show.
Yes. A hit hard enough to split a tyre will often have flattened part of the rim lip, and that will not seal properly afterwards.
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