A bulge in a sidewall is not a blemish. It is the cords inside the tyre letting go, and however much tread is left on top makes no difference to that verdict. Up on this ridge the damage usually arrives during a parking manoeuvre rather than a bang, because the kerbs along the Broadway are high and the bays are short.
We take the wheel off to look, which is the only honest way to read a cut, a split or a swelling. Plenty of the marks we get called out to turn out to be cosmetic, and when that is the case we say so and put the wheel straight back on. When the damage is real, you see it on the old casing before a new tyre goes anywhere near the hub. The alloy gets checked at the same time, because a kerb hard enough to bruise rubber on Cranley Gardens will often have knocked the rim slightly out of true as well.
You will get a straight driveable-or-not answer before anything else happens. A broken tyre is usually a slow discovery rather than a bang: a kerb strike, a pothole on a road like the A504, a cut picked up who knows where, a bulge spotted while it sat parked up in The Broadway. Midnight in Coldfall, midday in Tetherdown, the same call either way. School run in The Broadway or 1am in Fortis Green, we answer the same. Parked near Highgate Wood or tucked into Cranley Gardens, it is the same visit.

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Every route off this ridge is a descent, whether you drop down Muswell Hill Road, take Colney Hatch Lane or head over towards Crouch End, and a tyre with broken cords is at its most dangerous under braking on a slope. That is why we would rather examine a suspect wall while the car is still parked outside your house. The verdict is honest either way, and the wheel gets checked along with the rubber.
A driver noticed a soft egg shape on the outer wall after a week of squeezing into short bays. The cords had gone, so the tyre came off and a match went on at the kerb.
An owner in Coldfall assumed a scraped wall meant a new tyre. The gouge had not reached the casing, so the wheel went back on and the tyre stayed in service.
A family checking the car before a drive out past Highgate Wood found a slice across the shoulder. That area cannot be repaired, so a fresh tyre went on the driveway.
No. A lump means the internal cords have already broken and the tyre can fail with no warning at all. Leave the car where it is and we will come out and change it.
Only with the wheel off and the tyre inspected inside as well as out. Surface rubber loss is common on the high kerbs around N10 and is usually harmless, structural damage is not.
We will. A fair share of the marks we are called to see on Cranley Gardens and Tetherdown are purely cosmetic, and we would rather refit the wheel than sell you rubber you do not need.
Yes. A kerb that bruises a sidewall often leaves the rim slightly out of true, so we inspect the wheel while the tyre is off it and tell you plainly what we find.
Not long. Typical arrival across Muswell Hill is 30 to 60 minutes, and the inspection itself takes a few minutes once the wheel is off, with a replacement fitted there and then if one is needed.
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