A square kerb edge does not cut a tyre. It squashes it. The wheel slides or drops sideways into the granite, the sidewall gets caught between the hard edge of the rim and the hard edge of the kerb, and for a fraction of a second the rubber has nowhere to go. Cords inside the casing take that load and some of them break. What you see afterwards is a bright scrape on the alloy face, which is the least important part of the whole event.
The part that matters is on the inside, and it cannot be seen while the wheel is on the car. Parking in N1C forces this kind of hit more than most places, because the bays are short, the kerbs are high and reversing into a gap off Caledonian Road usually means feeling for the edge. So the wheel comes off, the bead gets broken and the inner liner is looked at under a light. A pinch shows there as two dark scuff marks a couple of inches apart, sometimes with the liner rippled or split between them. If those marks are present the tyre is finished, whatever the outside looks like.
Run your hand round the inside of the sidewall, slowly, with the car on the ground. What there is, is a replacement brought to you: correct size, fitted and balanced where the car stands in N1C, with the alloy and the sensor checked while the wheel is off. Same tools in the York Way area as in Caledonian Road, same on every call. Valve in Pentonville Road, balance in King's Cross, pressures before we go. The N1C postcode and a street in Battle Bridge: that is enough.
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Kerb strikes are the everyday tyre injury around here, because almost every parking manoeuvre in this corner of Islington finishes with a wheel close to a high granite edge. The damage is quiet. There is no bang, often no immediate pressure loss, and the only visible clue is a scrape on the alloy. Breaking the bead and looking inside is the difference between knowing and assuming.
A single blemish on the inner liner can be old and meaningless. A pair of them sitting opposite each other, where the rim edge would have been, is the signature of a pinch. That symmetry is what tells you the wall was crushed rather than rubbed, and it is the reason the wheel comes off before any verdict is given.
Plenty of kerb strikes end well. Where the rim edge has gouged but the sidewall shows nothing inside and the bead still seats cleanly, the tyre carries on quite happily. You get told that, the wheel goes back on and nothing gets sold. A scraped alloy is a cosmetic job for somebody else to quote for.
Sometimes the pinch splits the liner rather than the cords, and the tyre then loses a little air every week. Drivers put that down to the weather for a month or two. If a tyre started needing regular topping up shortly after a hard kerb hit near York Way, the bump and the leak are the same event.
Possibly, and possibly not, which is not a dodge. The outer rubber is thick and often takes a graze without harm, while crush damage sits on the inner wall out of sight. The only honest way to answer is with the tyre off the rim.
No. Patches belong in the tread, where the belt and casing are backed by rubber that barely changes shape. A sidewall bends thousands of times a mile and nothing bonded to it stays put. Broken cords there mean a replacement, every time.
Because the cords are what hold that air back, and a few broken ones simply pass their share of the load to their neighbours. It behaves perfectly at walking pace. It gives way when the wall is hot and heavily loaded, which is on a fast road.
Not at all, and it is worth doing. Pinch damage does not heal and it does not always announce itself early. A bulge appearing now on a tyre that was struck in the spring is the same injury finally working its way to the surface.
Only far enough off the red route that we can work safely. A permit bay, a quieter street off Pentonville Road or a car park behind the stations all suit us. We would rather come to a stationary car than have you drive on a wall that may already be broken.
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