There is a way of holding a lamp that finds damage nothing else finds, and it works far better at night than it ever does in daylight. Point a torch straight at a sidewall and everything flattens out; the light fills in every shallow dip and the whole surface reads as uniform. Bring the lamp round until it is nearly lying against the rubber, shining across the sidewall rather than into it, and any distortion at all throws a shadow. A ripple that was invisible a second earlier stands up like a ridge.
What you are hunting is an impact break. It happens when a tyre gets caught hard between the road and the edge of the wheel, usually against a square kerb or the lip of a pothole, and a small group of casing cords snaps inside the sidewall. Nothing is cut. Nothing leaks. The only outward sign is a faint lump or a shallow crease where the broken cords no longer hold the rubber flat, and it can sit there for weeks before the tyre lets go with no warning whatever. So when we are out at three in the morning for something else entirely, this is the check that gets done while the lamp is already in hand.
Shift work and tyre trouble go together, and not in a good way. Whoever comes out can repair as well as replace, so a nail found at that hour does not automatically cost you a tyre, whether the car is in Portman or at the roadside. Tight in Baker Street, easy in Devonshire Street: neither stops the job. Level in Devonshire Street, sloping in Portman: we set the car straight first.
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The tight mews and the narrow permit streets around Devonshire Street generate more kerb strikes than anywhere else in W1U, simply because of how much manoeuvring goes on in very little space. Most of those hits land on the inner sidewall, which is the face you never see, and most of them do no harm at all. The ones that do give you nothing to feel and nothing to hear. Ten minutes with a torch held low, once, after a hit that made you wince, is a much better use of an evening than finding out on the Marylebone Road.
A sidewall inspected head on looked untouched. Swinging the lamp round until it was almost flat against the rubber brought up a shallow ridge about the width of a finger, and that tyre came off the car that night.
A car squeezed into a space off Marylebone Lane had gone into the kerb harder than the driver realised. The wheel was unmarked. The tyre above it had a break in the casing that took a low lamp to find.
The inner sidewall takes most of these hits and is the one surface never looked at. Turning the wheels onto full lock and running the lamp along it is the only way to see it without taking the wheel off.
A group of casing cords snapped inside the sidewall by a single hard hit, usually a square kerb edge or a deep pothole. The rubber is not cut and the tyre does not lose air, so it feels perfectly normal to drive. What has gone is part of the structure holding the sidewall's shape, and that does not repair itself.
Yes, and the dark is the best time to do it. Use a torch held almost flat against the sidewall, shining across it rather than at it, and look for any ripple, crease or small lump breaking the shadow line. Do both sides of each tyre, turning the wheels onto full lock to reach the inner faces.
No. It is in the sidewall, which is outside anything the repair standard allows, and there is nothing to repair anyway because the injury is broken cord rather than a hole. The tyre is finished. The value of finding it is choosing when it comes off rather than having the tyre choose for you.
That is exactly how they behave, and it is what makes them dangerous. The remaining cords carry the load until one day they do not, usually on the first fast road after a long spell of gentle driving. There is no timetable to it, which is why the answer is to deal with it rather than to watch it.
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