Machined finishes, put right
Diamond Cut Wheel Refurbishment
A diamond cut wheel is refurbished by re-machining the face on a lathe and sealing it again under fresh lacquer. Wheel Repair Ltd does this at its workshop on Nursery Lane in Forest Gate, east London. Send a photo and we will tell you whether yours can be re-cut, because not every wheel can.
What people say
What diamond cut actually means
Most alloy wheels are painted. The colour goes on over a primer and the whole thing is sealed under lacquer.
A diamond cut wheel is different. After it has been painted, the wheel is put on a lathe and a fine cutter takes a very thin skim off the front face. That exposes bare aluminium in fine concentric lines, with the paint left in the recesses behind. Lacquer goes over the top to seal it.
The result is that bright, almost brushed look, with a sharp line between the machined face and the colour behind. It is what a lot of manufacturers put on their higher trim levels, and it is the reason those wheels cost more to put right.
How to tell whether yours are diamond cut
Look straight at the face of the wheel in daylight.
- Fine concentric rings. Very fine circular lines across the face, like the grooves on a record. That is the cutter.
- Two tones. Bright metal on the raised face, a darker colour sitting behind it in the recesses.
- It catches the light differently as you move. Painted silver looks the same from every angle. A machined face flickers.
If it is a flat, even silver with no rings in it, that is painted, and it is a different job at a different price. If you are not certain, a photo settles it in seconds.
How a diamond cut wheel is put right
Every wheel goes through the same sequence. It is why the finish lasts.
- Wheel off, tyre offThe tyre comes off so the rim can be reached properly and mounted true on the lathe.
- Strip and cleanOld lacquer and any failed finish come off. Machining over a bad lacquer just seals the problem back in.
- InspectChecked for cracks, buckles and how much face is left to work with. This is the point where we tell you if it cannot be re-cut.
- Repair the damageKerb damage filled and rubbed back so the cutter has a sound surface to work across.
- Paint the baseThe colour that sits in the recesses goes on first, because the cutter takes the face back off it afterwards.
- Machine the faceOn the lathe. A fine, even skim across the face to bring back the bright metal and the concentric lines.
- Lacquer and cureSealed and oven cured. On a diamond cut wheel this is the step that decides whether it lasts two years or ten.
- Tyre on, balanced, checkedRefitted and balanced before it goes back on the car.
Why diamond cut finishes fail
They fail more often than painted wheels do, and almost always for the same reason.
The lacquer is the only thing protecting bare metal. On a painted wheel there is paint underneath as well. On a diamond cut face there is nothing between the lacquer and the aluminium.
So when a kerb chips the lacquer, or a stone catches it, or road salt works into a weak spot, water gets underneath. The aluminium starts to oxidise and you get that cloudy, milky white patch spreading out under a lacquer that still looks intact from a distance.
It does not stop on its own. Once water is under there it keeps travelling, and the longer it is left the more material has to come off to reach clean metal. Catching it early is the difference between a straightforward re-cut and a wheel that has run out of skims.
Send a photo for a price A photo tells us what we are dealing with.
Can every diamond cut wheel be re-cut?
No, and anyone who tells you otherwise is guessing.
Every re-cut takes a little more metal off the face. A wheel will take that a limited number of times before the face is too thin to machine again safely. How many depends on the wheel, how deep the damage is, and how much has already been taken off by whoever did it last.
When a wheel has reached that point there are two honest options. It gets painted instead, which looks different but is perfectly sound and costs less. Or it gets replaced.
We will tell you which of those you are looking at before we start, not after. A wheel that should have been painted and was machined one time too many is not a repair, it is a problem passed on.
Send a photo for a price A photo tells us what we are dealing with.
Making the finish last
None of this is complicated, and it buys years.
- Rinse the salt off in winter. Grit and salt sit in the recesses and work at the lacquer. A hose down is enough.
- Keep acid wheel cleaners away from them. Strong cleaners attack lacquer. Warm water and a soft brush does the job on a wheel that is cleaned regularly.
- Deal with a chip early. A small chip is a small job. The same chip after a wet winter is a much bigger one.
- Watch the tyre fitters. A careless machine will mark a rim edge in seconds. It is worth saying something before they start.
Where the work happens
Diamond cutting is a workshop job. It needs a lathe, so it is not something anyone can genuinely do on your driveway, whatever they tell you.
The work is done at Unit 3, 13 Nursery Lane, London E7 8BL, in Forest Gate. Most customers bring the car in, or take the wheels off and bring just those, which is often the easier way to do it.
We are a short run from most of east London. There are pages for Forest Gate, Manor Park and Stratford, with more areas on the way.
Common questions
How much does diamond cut refurbishment cost?
It depends on the wheel size, how deep the damage is and how many you are doing. Wheel Repair Ltd prices from a photograph rather than publishing a figure that turns out to be wrong once we see the wheel. Send one over and you will get a written price.
Is diamond cut more expensive than painted?
Yes. A painted wheel is refinished. A diamond cut wheel has to be painted and then machined on a lathe and lacquered, so there are more stages and more time in it.
How many times can a diamond cut wheel be re-cut?
A limited number, because each cut removes a little more metal from the face. It depends on the wheel and on how much has already been taken off. We check before we start and tell you if yours has run out.
Can you do diamond cutting at my house?
No, and nor can anyone else. It needs a lathe. Any mobile service offering a genuine diamond cut on your driveway is not doing what it says. The work is done at our Forest Gate workshop.
My wheels have gone cloudy and white. Can that be fixed?
Usually yes. That is water under the lacquer oxidising the bare aluminium. It is fixed by stripping, repairing and re-cutting. The sooner it is looked at the less material has to come off to reach clean metal.
Can you match one wheel to the other three?
Usually, but be aware that a freshly cut face is brighter than three that have weathered. On a set that has aged noticeably, doing all four gives a better result. We will say honestly which yours needs.
Get a price
Send a photo of the wheel, taken straight on in daylight, and we will tell you whether it can be re-cut and what it will cost. Call or WhatsApp 07922 222272, or email info@wheelrepairltd.co.uk. Monday to Saturday, 8.30am to 6pm.