WHAT IS CENTRE BORE MACHINING?
Centre bore machining is the highly precise process of enlarging the central hole of an alloy or mag wheel so it fits perfectly onto your vehicle's hub. If you have purchased aftermarket wheels, or wheels originally designed for a different vehicle make, the centre bore may be too small to mount safely.
We use a precision CNC mill to enlarge the bore to the exact fraction of a millimetre required. This ensures a safe, vibration-free, "hub-centric" fit, meaning the weight of the vehicle is supported by the hub itself, rather than relying dangerously on the wheel studs.
WHY CNC PRECISION MATTERS
- Eliminate Highway Vibration: A wheel that doesn't sit perfectly snug on the hub will almost always cause severe steering wheel vibration at highway speeds, no matter how well the tyres are balanced.
- Safety First: We measure the wheel carefully before cutting. We will never machine a wheel if it leaves inadequate material around the bore, which would compromise the structural safety of the wheel. If your wheel has cracks or damage, we’ll recommend TIG welding first.
- No "Wobble Bores": We use industrial CNC machinery, not hand tools, routers, or drill attachments. This guarantees a perfectly concentric cut that matches factory tolerances.
OUR MACHINING PROCESS
- Assess & Measure: We confirm your vehicle's exact hub size, check the wheel's thickness, and ensure there is enough material for a safe enlargement.
- Set & Clock: The wheel is mounted and dial-indicated on our CNC machine so the cut is perfectly concentric to the mounting face.
- CNC Machine: The bore is cut to the target hub size with the correct surface finish and a proper lead-in chamfer for easy mounting.
- Deburr & Clean: The edges are neatly broken, and any surrounding paint or powder coat is protected or touched-in as required.
- Test-Fit & Balance: We test the fit on a reference hub and dynamically balance the wheel before handing it back to you.
FREQUENTLY ASKED QUESTIONS
CAN YOU REDUCE A CENTRE BORE?
No, machining only removes metal. To "shrink" a centre bore (if the wheel's hole is larger than your hub), we supply and fit specific spigot rings (plastic or alloy) to bridge the gap safely.
WILL MACHINING WEAKEN THE WHEEL?
Not when done within safe limits. We measure the wheel first and will only proceed if a safe amount of structural material remains after the cut. If a wheel isn't suitable, we will tell you upfront.
HOW LONG DOES IT TAKE?
Single wheels can often be machined on the same day. Full sets typically take 24–48 hours.
READY FOR A PROPER HUB-CENTRIC FIT?
Don't risk driving on poorly fitted wheels. Pair this service with our tyre fitting and balancing for a complete wheel setup. Send a couple of photos and your hub size (or car make/model), or pop by our Grey Lynn workshop. We'll confirm suitability and quote fast.
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grey lynn, auckland
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