A cut is measured in depth, not in length. That is the part that surprises people. A tidy little nick a centimetre long that has gone through the rubber and reached the cords underneath means the tyre is finished. A dramatic looking scrape running half the width of the sidewall that has only taken off surface rubber and lettering may be entirely cosmetic. What you can see from the pavement tells you almost nothing about which of the two you have.
So the test is what is at the bottom of it. If there is fabric or fine steel wire visible in the base of the cut, the structure has been opened and the tyre is scrap, regardless of the fact that it is holding air perfectly well today. Air pressure is the only thing giving a tyre its shape, and the material meant to contain that pressure is no longer continuous.
Big alloys and low-profile tyres look good and break easily. We check both when we come out to Ashley Park or wherever the car is standing: the tyre for cuts, splits and bulges, and the alloy for damage, before anything goes back on. Steep camber in Walton Town? We move a few metres, Hersham or anywhere else. Blocked drive in Ashley Park? Open kerb in Oatlands? Either works.

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The parked-tight streets around Hersham and Lower Green produce most of the kerb damage we see in Walton, and the bridge approaches produce most of the pothole damage. Both leave marks that look worse than they are about half the time. It is worth having somebody read the bottom of the cut rather than deciding from the top of it.
Small, neat and terminal. Once the fabric is visible the casing has been opened and no repair addresses it, because repairs are for the tread area and this is structural damage to the wall.
Ugly and often harmless. If it has taken the lettering off and nothing more, we will tell you the tyre is fine and fit nothing. That answer is worth having and it does not cost you a tyre.
The A3050 sees steady through-traffic and the surface takes the punishment. A deep hit can split a sidewall outright, and it can also buckle the rim behind it, so both get looked at while the wheel is off.
No. Repairs are confined to the central tread area because that is the only part of the tyre that does not flex constantly. A sidewall bends thousands of times a mile and nothing stays bonded to it.
Deep enough to reach the cords. If you can see fabric or wire in the bottom of it, that is the answer. If it is rubber all the way down, it is usually cosmetic.
Because the pressure is being held by material that has been cut through. It works until the load, the heat and the next pothole line up, and then it does not, usually without warning.
Yes. Anything hard enough to cut a tyre often marks or buckles the rim, so both come under the light while the wheel is off. A buckled rim will leak past the bead even with a perfect tyre on it.
Yes, and if the tyre turns out to be sound we say so and sell you nothing. Describe it on the phone first and we can often give you a good idea before anyone travels.
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