A hub-centric ring for a wheel with a 73.1 mm center bore on a vehicle with a 64.1 mm hub pilot is sized 73.1 mm outside diameter × 64.1 mm inside diameter. The ring’s outer edge fits the wheel; its inner opening fits over the vehicle hub. This direction is important: reversing the dimensions will not produce the intended fit.
Confirm the wheel bore: 73.1 mm
The wheel center bore is the opening through the center of the wheel that locates over the vehicle’s hub pilot. For this fitment, the wheel bore must be confirmed as 73.1 mm.
Check the wheel manufacturer’s specifications for the exact wheel model and version. Do not assume all wheels from the same brand or design share a center bore. If you measure the bore yourself, use a suitable measuring tool and account for any chamfer, coating, or irregularity at the opening. A measurement taken across a bevel may not represent the straight-sided bore where the ring sits.
The ring’s outside diameter (OD) is the dimension that must match the wheel center bore. A ring with an OD that is too small may not stay centered in the wheel; one that is too large may not seat or may require force. Do not use force to make a mismatched ring fit.
Confirm the vehicle hub: 64.1 mm
The vehicle hub pilot is the raised cylindrical section at the center of the hub that enters the back of the wheel. For this fitment, confirm that its diameter is 64.1 mm.
Use vehicle-specific service or fitment information where available, and verify the hub measurement if the vehicle has modified hubs, spacers, or other non-original parts. The hub may have a chamfer, rust, paint, or buildup that affects how a ring seats. Measure the cylindrical locating surface rather than a rounded edge or the wider face around it.
The ring’s inside diameter (ID) fits over the vehicle hub pilot. For the stated dimensions, that ID is 64.1 mm.
How to read the ring size
A hub-centric ring bridges the difference between a larger wheel bore and a smaller vehicle hub:
| Part or feature | Required dimension |
|---|---|
| Wheel center bore | 73.1 mm |
| Ring outside diameter | 73.1 mm |
| Ring inside diameter | 64.1 mm |
| Vehicle hub pilot | 64.1 mm |
The basic sizing relationship is:
Ring OD = wheel center bore Ring ID = vehicle hub pilot diameter
Product listings may show the dimensions as 73.1–64.1 mm, but formatting varies. Confirm which number is OD and which is ID before ordering; do not rely on the order of the numbers alone. If a listing does not identify the dimensions clearly, ask the seller to confirm them.
Check tolerance, shape, and material
These are nominal dimensions. A ring should fit the wheel bore and hub pilot closely enough to center the wheel, while still seating fully without being hammered or distorted. A loose ring may not reliably locate the wheel during installation; an overly tight ring may bind, crack, or prevent the wheel from sitting flat.
Also check the ring’s shape and depth. Some rings have a straight-sided profile; others include a flange or bevel. Confirm that the design can sit in the wheel bore without interfering with the wheel’s mounting face, hub, or other hardware. The ring must not hold the wheel away from the hub mounting surface.
Common ring materials include plastic or polymer and aluminum. Neither material is automatically right for every application. Consider the wheel and hub environment, the ring manufacturer’s stated use, temperature exposure, and how readily the ring can be removed for service. Whatever the material, it must retain its shape, fit securely, and allow the wheel to mount flush. Avoid selecting by material name alone if the dimensions or fit are uncertain.
A hub-centric ring addresses only the center-bore difference. It does not correct an incorrect bolt pattern, wheel offset, wheel width, or brake-clearance problem, and it does not make an otherwise incompatible wheel suitable for a vehicle.
Installation and corrosion checks
Before fitting the ring, remove the wheel and inspect the hub pilot and wheel bore. Clean away loose rust, dirt, and debris without removing material from the hub or wheel. Check that the ring is undamaged and that it seats evenly in the wheel bore or on the hub, according to its design.
Fit the wheel so it sits flat against the hub mounting face. The ring must not be pinched, tilted, or trapped between faces that should contact directly. Start the wheel fasteners by hand and tighten them in the vehicle manufacturer’s specified sequence and to the specified torque. Follow the vehicle and wheel manufacturers’ instructions; do not use a ring as a substitute for correct fastener engagement or tightening.
Corrosion can make a correctly sized ring difficult to remove later, particularly where dissimilar materials meet. Inspect the hub and ring during wheel changes, and replace a ring that is cracked, deformed, badly corroded, or no longer fits securely. Do not apply grease or anti-seize unless the relevant manufacturer permits it; products on mounting or fastener surfaces can affect clamping and torque.
Product-selection checklist
Before buying a 73.1 mm to 64.1 mm hub-centric ring, verify:
- Wheel bore: 73.1 mm, confirmed for the exact wheel.
- Vehicle hub pilot: 64.1 mm, confirmed for the actual hub.
- Dimension direction: 73.1 mm is the ring OD; 64.1 mm is the ring ID.
- Profile and depth: The ring seats fully without interfering with the wheel or hub.
- Material and use: The ring’s material and construction are suitable for the intended installation.
- Condition and fit: The ring is undamaged and fits without excessive looseness or force.
- Other fitment details: Bolt pattern, offset, fasteners, and brake clearance are checked separately.
If either measurement is uncertain, confirm it before ordering. A correctly specified 73.1 mm OD × 64.1 mm ID ring is the dimensional match for the stated wheel bore and vehicle hub; the finished fit still depends on the wheel, hub, ring profile, and actual condition of the mounting surfaces.
