Sidewall Damage — Why It Always Means a New Tyre
A practical guide to tyre sidewall damage for UK drivers, from the CarPal mobile tyre team.
Why the sidewall is different
The tread sits on a belt package that gives it structure. The sidewall has no such backing — it is a flexing membrane that bends thousands of times a minute.
Any repair applied there is being flexed constantly and will fail. That is why BS AU 159 excludes the sidewall and shoulder entirely from repairable areas.
What a bulge means
A bulge or bubble means the internal cords have broken, usually from a pothole or kerb impact. Air has pushed into the gap and is being held back by rubber alone.
This is the most urgent tyre fault there is. A bulged tyre can fail suddenly at speed. Replace it before driving any distance.
Cuts, cracks and kerbing
A cut deep enough to expose cord means replacement. Superficial scuffing from kerbing usually does not, but it needs inspecting properly — kerb damage can also distort the rim and cause slow bead leaks.
Fine cracking across the sidewall is age-related perishing. On an older tyre with full tread, that is still a replacement.
What we do
We inspect on arrival and give you a straight answer. If it is sidewall damage we will tell you it needs replacing rather than attempting something that will not hold.
We carry a range of tyres and can fit at your location, so it is one visit rather than a recovery plus a garage appointment.
Frequently Asked Questions
Learn why tyre sidewall damage can be dangerous, what causes it and when a damaged tyre needs replacing.
Can sidewall damage be repaired?
No. The tyre sidewall flexes constantly while driving, making a safe repair unsuitable. A tyre with sidewall damage must be replaced.
Is a bulge in my tyre dangerous?
Yes, very. A bulge usually indicates that the tyre's internal structure has failed. The tyre should be replaced immediately. Do not continue driving on it, as it could suffer a sudden failure.
Does kerbing damage a tyre?
Yes. Hitting a kerb can cause sidewall scuffs, cuts or damage to the wheel rim that may lead to slow air leaks. Have the tyre and wheel inspected after a significant impact.
What causes sidewall cracks?
Sidewall cracks are usually caused by tyre ageing and exposure to ultraviolet (UV) light. Fine cracking on an older tyre can indicate deterioration. Have the tyre inspected and replace it if it is no longer safe.
Need Mobile Tyre Fitting?
CarPal can help with a damaged tyre at your location. Call our team for assistance and a free, no-obligation quote.
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