Can a Cracked Alloy Wheel Be Repaired? A Specialist Explains

It is one of the questions we are asked most often: my alloy has a crack — can it be saved, or do I have to buy a new one? The honest answer is that it depends entirely on the crack. Some cracked wheels can be welded and put safely back on the road; others should never be repaired and need replacing. This guide explains how a specialist tells the difference, so you can make a safe, informed decision rather than a cheap one.

Not all cracks are the same

The word "crack" covers very different situations, and the type matters enormously when deciding whether a repair is viable.

Surface and fatigue cracks

Fine hairline cracks, often on the inner barrel or rim flange, that have developed gradually from repeated stress rather than a single big impact. Caught early and in a low-stress location, many of these are good candidates for TIG welding.

Structural and impact cracks

Cracks caused by a sharp impact — a deep pothole, a kerb strike at speed — that run through load-bearing areas such as the spoke roots or the centre. These are the dangerous ones. Some can be repaired; many cannot, because the area carries too much load to trust a weld.

Corrosion cracks

Cracking that starts where corrosion has weakened and pitted the metal, usually on the barrel or bead seat. Because the surrounding material is already compromised, these often mean the wheel is at the end of its safe life.

Signs your wheel may be cracked

• A slow, persistent loss of tyre pressure with no visible puncture.
• A vibration through the steering or seat that was not there before.
• A visible hairline on the inner barrel, rim flange or behind a spoke.
• Bubbling or flaking lacquer along a line — sometimes the finish cracks where the metal has.

If you suspect a crack, stop driving hard on the wheel and get it assessed. A crack rarely gets better on its own; under load it tends to grow.

When can a cracked alloy be repaired?

A crack is generally repairable when it is in a low-to-moderate stress area — typically the inner barrel or rim flange — is reasonably short, the surrounding metal is sound, and the wheel has not already failed in the same place before. In those cases a correctly executed TIG weld restores the structural integrity for normal road use.

A wheel should be replaced rather than repaired when the crack is in a high-stress zone such as a spoke root or the centre bore, when it is long or branching, when corrosion has weakened the surrounding metal, or when there is any sign the wheel has cracked and been welded before in the same area.

The line we will not cross: we would rather turn a job away than weld a wheel we do not trust. If we assess a crack as unsafe to repair, we will tell you clearly and recommend replacement — your safety at motorway speed is the deciding factor, not the size of the invoice.

How TIG welding a cracked alloy works

TIG (Tungsten Inert Gas) welding is the correct process for aluminium alloy wheels because it gives precise, controllable heat and produces a clean, strong weld that can be dressed to a smooth finish. The process, step by step:

• The crack area is thoroughly cleaned to remove all contamination and old coating.
• A filler rod is selected to match the wheel's specific aluminium alloy.
• The wheel is pre-heated in a controlled way to reduce thermal shock and avoid new cracking.
• The weld is laid in, then the area receives post-weld heat treatment to relieve internal stress.
• The bead is dressed back flush and the area is refinished to match the rest of the wheel.

The risk of driving on a cracked wheel

A crack under repeated load does not stay still — it propagates. At low speed a sudden failure is alarming; at motorway speed it can mean rapid air loss and loss of control. There is no safe distance to drive on a wheel you know is cracked. If in doubt, fit the spare or have the car recovered, and get the wheel assessed before using it again.

Repair cost vs replacement

Where a crack is safely repairable, TIG welding starts at €85 per wheel — a fraction of the €400–€900 a replacement OEM wheel for a premium car typically costs. But cost should never be the reason to repair an unsafe crack. Use price to choose between repair and replacement only when both are genuinely safe options.

Frequently asked questions

Can every cracked alloy wheel be repaired?

No. Cracks in low-stress areas such as the inner barrel can often be welded safely, but cracks in spoke roots, the centre, or corroded metal usually mean the wheel must be replaced.

Is a welded alloy wheel safe?

A correctly TIG-welded repair on a suitable crack, by a qualified operator, restores structural integrity for normal road use. We only weld cracks we are confident are safe.

How much does crack repair cost?

Crack repair by TIG welding starts at €85 per wheel, with the final price depending on the crack's location and length.

Can I keep driving on a cracked wheel until I get it fixed?

No. A crack grows under load and can fail suddenly at speed. Fit the spare or have the car recovered and get the wheel assessed first.

The Wheel Lab — Camí dels Mollons 34, 46970 Alaquàs (Valencia), Spain  |  Ver esta guía en Español