Some cracked alloy wheels can be repaired and some should be replaced. Repairability depends on the crack's location, length and direction, the wheel's previous repair history, and whether there is deformation or corrosion around it. A short crack in a lower-stress area may be repairable by welding; a crack through a spoke, the hub mounting face or a load-bearing section usually means replacement. A crack cannot be judged safe from a photograph — the wheel needs to be inspected before anyone can confirm what is possible. Until then, don't keep driving on it: fit the spare and bring the cracked wheel in.
Cracked alloy wheel repair is one of the few wheel jobs where the right answer is sometimes "don't repair it at all". A crack is not a scuff or a bit of corrosion — it is a structural fault, and whether it can be repaired safely depends on where it sits, how it runs, and what else is going on with the wheel. This guide explains what causes alloy wheels to crack, why crack location matters more than length, when welding is a sensible option, and when replacement is the safer and more honest recommendation.
Most cracks we see start with a single sharp impact rather than gradual wear. UK roads do not help: a deep pothole hit at speed, a hard kerb strike, or a heavy landing over a raised drain can concentrate enough force on one point of the rim to crack it. Larger-diameter wheels with low-profile tyres are more exposed, because there is less tyre sidewall to absorb the blow before the rim takes it.
Cracks can also follow on from earlier damage. A wheel that has already been straightened, welded or heavily refinished may have less margin left in the metal, so a later impact that a healthy wheel might have shrugged off can be enough to start a crack. This is one reason a wheel's history matters as much as its current appearance.
People understandably focus on how long a crack looks, but in the workshop the position of the crack is what decides most of the outcome. The same length of crack can be a manageable repair in one place and a clear replacement in another.
Some cracks here are repairable, but they often explain the slow puncture, because the tyre can no longer seal against a cracked bead area.
These carry load and are highly visible, so a crack here is treated with much more caution.
Cracks around the centre bore or stud holes sit in a critical, high-stress zone and frequently mean the wheel should be replaced.
We do not publish a fixed list of "repairable" and "non-repairable" crack positions, because direction, depth and the condition of the surrounding metal all feed into the decision. What looks like a simple hairline on the surface can run further into the wheel than it appears.
Cracks are not always obvious, and many sit on the inside of the wheel where they are easy to miss. Treat the following as reasons to get the wheel looked at:
Repeat pressure loss and new vibration have several possible causes, so they are not proof of a crack on their own — they overlap with the symptoms covered in our guide to spotting damaged and unsafe wheels. That is exactly why an inspection matters: it separates a cracked wheel from a buckle, a corroded bead seat or a tyre fault.
It depends on the damage, but our advice is not to. A crack can grow under heat and load, and a wheel that is losing air through a crack can lose pressure suddenly. Fit your spare wheel and bring the cracked one to us for a free inspection. The DVSA treats this seriously too: its MOT inspection manual lists any fracture or welding defect on a road wheel as a dangerous defect. Our guide on whether a damaged or cracked alloy wheel will fail an MOT explains what testers look for.
Some cracks can be welded and returned to safe use; others should not be. Welding is a genuine repair method, not a routine answer to every crack, and it has to be judged for the individual wheel — the alloy, the crack's position, and whether there is deformation or previous repair work around it all affect whether it is appropriate. A wheel that has already been welded once and cracked again in the same area is usually telling you it has reached the end of its safe life.
If you want to understand how a welded repair is assessed — including how testers and insurers tend to view them — our guide on whether alloy wheel welding is safe goes into more detail. For the repair itself, our alloy wheel welding service starts with an assessment so we only weld where it is the right call. We do not provide DIY welding instructions: a crack repair done without the proper assessment and process can leave a wheel looking fixed while remaining unsafe.
Where a crack is repairable, this is how the job runs in our workshop:
Most welding repairs are done the same or next day; if the wheel also needs a full refinish, allow 2–3 days. Book in advance online, by phone or on WhatsApp — same-day appointments are usually available.
A successful-looking repair is not the same as a structurally sound wheel. We will advise replacement rather than repair when:
We don't supply wheels ourselves. If yours can't be saved, we'll recommend a supplier you can buy a replacement from.
Recommending a new wheel is not the easy or the most profitable answer, but it is the correct one when a crack falls outside safe repair limits. Damaged road wheels are assessed as a safety-related item, as set out in the DVSA MOT inspection manual (axles, wheels, tyres and suspension), which is one more reason not to gamble on a borderline repair.
We are happy to look at clear photos for an initial indication, and they help us tell you what to expect. But a photograph cannot show how deep a crack runs, whether it continues out of sight on the inner barrel, or what condition the surrounding metal is in. Two wheels with near-identical surface cracks can need completely different treatment once they are in front of us. For anything structural, the wheel has to be inspected before a safe recommendation can be made — that is a limit of the medium, not caution for its own sake.
Where a crack is genuinely repairable, repair is often the more economical route, particularly on larger or premium wheels where a replacement is expensive. Where it is not, replacement protects you and is usually the better long-term spend. Cost should follow the safety decision, never lead it. Welding is priced per wheel: the guide price is £96 + £48 per additional weld (inc. VAT), and refinishing is extra if you want it. Our prices page has the current figures, and the same thinking on damage type and severity is covered in our guide on alloy wheel repair versus refurbishment.
If you suspect a crack — a stubborn slow puncture, a visible line on the rim, or new vibration after an impact — the safest step is to stop relying on the wheel and have it assessed. Send clear photos of the wheel face and the inner rim if you can, tell us the wheel size and what happened, and we will give you an initial view and arrange a free inspection. We will tell you honestly whether the crack can be repaired, whether welding is appropriate, or whether replacement is the safer choice for that wheel.
We assess and repair cracked alloy wheels across London, Essex & surrounding areas, with a safety-first inspection and a clear repair-or-replace recommendation. If a crack is beyond safe repair, we will tell you.
This article is general guidance based on workshop experience and cannot diagnose an individual wheel. A crack is a structural fault: repairability depends on the condition of the wheel at the time of inspection, and a repaired wheel cannot be guaranteed roadworthy without that assessment. If you suspect a crack, have the wheel checked before driving on it.
We restore kerbed, scratched, buckled and corroded alloys across London & Essex. See our alloy wheel repairs, full refurbishment and prices, or send a few photos for a quick quote.
Cracked alloy wheel? Learn when welding is safe, when it isn’t, how MOT inspections treat welded wheels, insurance considerations, and realistic repair times. London & Essex.
Read the guideCracked, buckled or kerbed alloy before your MOT? What actually fails, what's just cosmetic, the tyre-sealing catch, and why no workshop can guarantee a pass.
Read the guideA workshop decision guide: what alloy wheel repair can genuinely fix, the damage that means replacement, the cost logic, and why the final call follows an inspection.
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