Not every lump on a sidewall is a failure. Tyres are built up from layers and the joins in those layers leave slight ridges and hollows in the finished rubber, so a wall can have gentle undulations in it from the day it was made and go on to a perfectly ordinary life. What tells the two apart is shape and consistency. A manufacturing ripple is broad, soft edged and usually mirrored round the tyre. A genuine bulge is a defined dome, often no bigger than a thumbnail, sitting on its own with nothing like it anywhere else on the wall.
The other test is what it feels like. Press a manufacturing ripple and it is as firm as the rubber either side of it. Press a bulge and it gives, because there is nothing behind it, and that is a broken casing. The speed humps and square kerbs around here produce plenty of the second kind, so it is a call worth making. Sometimes the answer is that the tyre was always like that and you keep it, which is a much better outcome than the one people expect when they ring.
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 Shepherd's Bush, with the alloy and the sensor checked while the wheel is off. Nothing is towed out of Wood Lane or Brackenbury; the work finishes there. Pressures set before we leave Brackenbury, and the same on Westway.
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The humps and square kerbs around W12 produce a steady run of genuine sidewall bulges, and a fair few false alarms alongside them. Telling the difference takes a look and a thumb rather than a photograph, so it is a call worth making. If the tyre is sound you keep it, and if the cords have gone there is stock on the van rather than a wait.
A driver near Askew Road found a soft ridge on a sidewall and assumed the worst. It was a moulding line, firm to the touch and matched on the other side.
A car near Wood Lane took a hump harder than intended and developed a small dome on the inner wall. That one had given way and had to be replaced.
A tyre off a car near the Green had a single defined lump with nothing similar anywhere on the wall. Cords had gone underneath it.
Shape and firmness. A moulding line is broad, soft edged and hard to the touch. A bulge is a small defined dome that gives when you press it.
If it gives under a thumb, yes. That is a broken casing rather than a cosmetic feature, and it fails without warning.
No. Nothing in the sidewall can be repaired at any price, which is why the distinction between the two is worth making properly.
Frequently, and it is the outcome we like giving. There is nothing in condemning a tyre that has years left in it.
That is the idea. It gets checked where it is parked, and if a replacement is needed it comes off the van on the same visit.
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