Hub adapters · PCD conversion adapters · UK CNC machined

Precision Hub Adapters

Brightstone Engineering manufactures precision hub adapters, PCD adapters and custom wheel conversion kits in the UK from 6082-T6 aluminium. Designed for accurate hubcentric location, correct bolt pattern conversion and secure wheel fitment.

Popular conversions → Custom PCD adapters → Custom enquiry →
UK manufacturedCNC machined in-house
6082-T6 aluminiumBillet material
Hubcentric designCorrect centre location
Custom fitmentsPCD and hub conversions

Popular hub adapter conversions.

Hub adapters allow wheels with one bolt pattern to be fitted to a vehicle with a different bolt pattern. Start with a common conversion or request a custom configuration.

CustomCustom PCD adaptersMade to your specification BMWBMW 5×120 to 5×114.3 adaptersCommon wheel conversion BMWBMW 5×120 to 5×112 adaptersOEM and aftermarket wheel swaps PorschePorsche 5×130 PCD adaptersSpecialist Porsche conversions Mercedes-BenzMercedes 5×112 PCD adaptersHubcentric conversion adapters BespokeUnlisted hub adapter conversionsSend vehicle and wheel specs

Find the right adapter type.

The terms overlap, but the right product depends on whether you need bolt pattern conversion, centre bore correction, or a simple wheel spacer.

01 PCD adapters Convert one wheel bolt pattern to another, such as 5×120 to 5×114.3. Custom PCD adapters → 02 Hub adapters Correct centre bore differences between vehicle hubs and wheels. View hub adapters → 03 Wheel spacers Move the wheel outward while keeping the same bolt pattern. Browse wheel spacers → 04 Custom machining For rare fitments, motorsport builds and one-off wheel conversions. Contact Brightstone →

What are hub adapters?

Hub adapters are precision-machined components used to solve wheel fitment problems. Depending on the application, they can change the wheel bolt pattern, correct the centre bore, increase spacing, or allow wheels from one manufacturer to be fitted to another vehicle.

PCD adapters, sometimes called PCD conversion adapters, are a specific type of hub adapter that converts one bolt pattern to another. For example, a vehicle with a 5×120 bolt pattern may need an adapter to fit wheels drilled to 5×114.3 or 5×112.

A properly designed adapter must do more than change bolt holes. It must locate accurately on the vehicle hub, provide the correct centre bore for the wheel, use the correct hardware, and have sufficient thickness and strength for the application.

Why use PCD adapters?

PCD adapters are useful when the wheels you want do not share the same bolt pattern as the vehicle. They are common on custom builds, rare wheel fitments and brand-to-brand conversions.

Wheel conversionFit wheels with a different bolt pattern to the original vehicle hub.
Rare wheel fitmentUse OEM or aftermarket wheels that are not normally available for your car.
Brake clearanceIncrease wheel spacing where required for larger brake calipers.
Offset correctionMove wheel position outward while changing bolt pattern at the same time.
Hubcentric locationMaintain correct centre location on both the vehicle hub and the wheel.
Custom buildsUseful for kit cars, race cars, restomods and specialist wheel swaps.

Hub adapters vs wheel spacers.

The products can look similar, but they solve different fitment problems.

Hub adapters / PCD adapters

  • Change bolt pattern between vehicle and wheel.
  • Can correct centre bore differences.
  • Often use dual PCD machining and separate hardware.
  • Common for brand-to-brand wheel conversions.
  • Typically require more design checks than simple spacers.

Wheel spacers

  • Keep the same bolt pattern.
  • Move the wheel outward from the hub face.
  • Used for stance, offset correction and brake clearance.
  • Usually simpler than a PCD conversion adapter.
  • Best when the wheel already matches the vehicle PCD.

Hub adapters by vehicle.

Most hub adapter projects start with the vehicle brand, then confirm the wheel bolt pattern, centre bore and target offset.

BMW5×120 / 5×112 conversions Audi5×112 fitments Mercedes-Benz5×112 fitments Porsche5×130 conversions All brandsShop by car →

Engineered around the full fitment.

A safe adapter must consider more than bolt pattern. Centre location, hardware clearance, thread engagement, thickness and wheel offset all matter.

Material6082-T6 billet aluminium
DesignHubcentric location on vehicle side and wheel side
MachiningDual PCD, centre bore, counterbores and mounting hardware features
HardwareSpecified by thread, seat type, length and installation method
ApplicationsRoad cars, performance cars, custom builds, race cars and specialist vehicles

Technical fitment guides.

These guides help explain the measurements needed before ordering hub adapters or PCD conversion adapters.

Guide Hubcentric Fitment Explained Why centre bore and hub location matter. Guide PCD Explained How bolt pattern is measured and why it matters. Guide Spacer Size Guide Understanding thickness, offset and clearance.

Related products.

Depending on your fitment, a different product may be more suitable than a PCD adapter.

01 Wheel spacers For moving wheels outward while keeping the same bolt pattern. Browse wheel spacers → 02 Hub adapters For centre bore changes and wheel-to-hub location issues. View hub adapters → 03 Centrelock adapters Specialist centrelock components and conversions. View centrelock adapters → 04 Custom enquiry For unlisted PCDs, rare wheels and specialist builds. Contact Brightstone →

Hub adapter FAQs.

Common questions before ordering PCD adapters, hub adapters or custom wheel conversion parts.

What is a hub adapter?

A hub adapter is a machined component used to adapt wheel fitment. It may correct centre bore, change bolt pattern, add spacing, or combine several of these functions in one part.

What is a PCD adapter?

A PCD adapter converts one bolt pattern to another. For example, it can allow wheels drilled to 5×114.3 to be fitted to a vehicle with a 5×120 hub, provided the adapter is designed correctly.

Are PCD adapters safe?

They can be safe when correctly engineered, hubcentric, manufactured from suitable material and installed with the correct hardware. The design must account for centre location, thickness, bolt clearance and thread engagement.

What information do you need for custom adapters?

We need the vehicle PCD, wheel PCD, vehicle centre bore, wheel centre bore, required thickness, bolt or stud type, thread size, seat type and any clearance constraints.

Can hub adapters change wheel offset?

Yes. Because adapters have thickness, they move the wheel outward and effectively reduce offset. This must be considered when calculating final wheel position.

Do adapters include hardware?

Where required, adapters are specified with the correct bolts, studs or nuts for the application. Hardware depends on the vehicle, adapter thickness and wheel design.

Can you make one-off PCD adapters?

Yes. Brightstone Engineering can produce custom PCD adapters for unlisted fitments, rare wheels and specialist builds where the measurements are known or can be confirmed.

Need custom hub adapters?

Send your vehicle PCD, wheel PCD, centre bore sizes and required thickness, or contact Brightstone Engineering if you need help confirming the correct specification.

Custom adapters → Contact →