73.1 mm to 57.1 mm Hub-Centric Rings: Sizing and Fitment Guide
For a wheel with a 73.1 mm center bore and a vehicle hub measuring 57.1 mm, the correct hub-centric ring size is:
73.1 mm outside diameter (OD) × 57.1 mm inside diameter (ID)
The 73.1 mm dimension matches the wheel’s center bore, while the 57.1 mm dimension matches the vehicle’s hub pilot. In other words, the ring fills the clearance between the larger wheel bore and the smaller vehicle hub.
This sizing direction is important. A ring labeled 57.1–73.1 mm may use a different labeling convention, so check the manufacturer’s definition of each number. The critical specification is that the ring’s outer diameter fits the wheel bore and its inner diameter fits over the vehicle hub.
Confirm the wheel bore: 73.1 mm
The wheel’s center bore is the machined opening through the center of the wheel. For this application, it should be approximately 73.1 mm.
Confirm the wheel bore from a reliable source, such as:
- The wheel manufacturer’s technical specifications
- Markings or documentation supplied with the wheel
- A measurement taken with a suitable caliper
- A verified wheel fitment record
Do not assume that a wheel’s bolt pattern or wheel diameter identifies its center bore. Wheels with the same bolt pattern can have different bores, and an aftermarket wheel may use a larger universal bore intended to be matched with hub-centric rings.
The ring’s OD must be compatible with the actual wheel bore. A ring that is too large will not enter the bore. A ring that is substantially undersized may not center the wheel correctly or may move during installation.
Nominal dimensions versus measured dimensions
The numbers 73.1 mm and 57.1 mm are normally nominal fitment dimensions. The wheel bore and vehicle hub may not measure exactly those values with every measuring tool. Coatings, paint, corrosion, chamfers, dirt, and manufacturing tolerances can affect the measurement.
If measuring the wheel, measure the cylindrical bore rather than an entry chamfer. If measuring the vehicle, measure the cylindrical pilot surface where the ring will locate. A caliper should be used carefully and should not be forced into a tapered or contaminated area.
Confirm the vehicle hub: 57.1 mm
The vehicle hub pilot is the raised cylindrical portion that enters the wheel’s center bore. For this fitment, the ring’s ID should be designed for a 57.1 mm vehicle hub.
Before ordering, inspect the hub for:
- Rust or oxidation on the pilot surface
- Dirt, old coating, or wheel-seating debris
- Damage or burrs
- A retaining shoulder or shape that affects ring seating
- Sufficient cylindrical surface for the ring to locate
The hub measurement should be taken from the portion that the ring will actually contact. Do not measure a nearby flange, dust cap, or chamfer and treat that as the hub pilot diameter.
A ring with a 57.1 mm ID should slide over a clean 57.1 mm hub pilot with a close fit. It should not require hammering, and it should not be so loose that it rattles noticeably on the hub.
Why OD matches the wheel and ID matches the hub
A hub-centric ring adapts a wheel with a larger center bore to a smaller vehicle hub:
| Fitment feature | Required dimension |
|---|---|
| Wheel center bore | 73.1 mm |
| Vehicle hub pilot | 57.1 mm |
| Ring outside diameter | 73.1 mm |
| Ring inside diameter | 57.1 mm |
The ring’s outside surface locates inside the wheel bore. Its inside surface locates on the vehicle hub. This makes the wheel and hub share a common center rather than relying only on the wheel fasteners to position the wheel.
The diameter difference is:
73.1 − 57.1 = 16.0 mm
That is an 8.0 mm radial gap between the smaller hub and the larger wheel bore, which the ring fills.
A hub-centric ring does not change the wheel’s bolt pattern, offset, backspacing, load rating, or brake clearance. It also does not correct an incorrect bolt pattern. The wheel must already be suitable for the vehicle in those respects, and the fasteners must be correct for the wheel and vehicle.
Check the ring profile, tolerance, and material
Matching only “73.1 to 57.1” may not be enough. Confirm the ring’s physical design is compatible with both the wheel and the hub.
Profile and engagement
Check whether the wheel and hub require:
- A straight cylindrical ring
- A ring with an outer or inner chamfer
- A stepped or lip-style profile
- A retaining ridge or clip
- A specific ring thickness or axial height
The ring must seat fully without preventing the wheel from sitting flush against the vehicle mounting face. A ring that is too thick, has an incompatible lip, or contacts a chamfer incorrectly can hold the wheel away from the hub.
The ring should provide stable radial location over the available cylindrical surfaces. Avoid selecting a ring based on diameter alone if the wheel bore or hub has an unusual shoulder, taper, or limited engagement length.
Tolerance and fit
A correctly selected ring normally has a close, installation-friendly fit:
- The OD should locate securely in the 73.1 mm wheel bore.
- The ID should pass over the 57.1 mm hub without excessive looseness.
- The ring should not need force that could damage the wheel, ring, or hub.
- The ring should not prevent the wheel from seating against the mounting face.
Because nominal dimensions do not describe every production tolerance, compare the supplier’s stated fit tolerance with your measured parts where possible. If the wheel bore has heavy paint or powder coating, the usable diameter may be smaller than the nominal machined dimension.
Material
Common hub-centric ring materials include engineered plastics and aluminum alloys. The relevant choice depends on the application and the ring design, not simply on material labels.
Evaluate:
- Temperature resistance for the intended service
- Resistance to water, salt, and road chemicals
- Dimensional stability
- Resistance to cracking or deformation
- Compatibility with the wheel and hub surfaces
- Whether the design is intended for repeated wheel removal
Aluminum rings may require more attention to corrosion and fit because dissimilar metals and road contamination can promote seizing. Plastic rings can be corrosion-resistant but still must have suitable temperature and mechanical properties. Use the manufacturer’s stated specifications rather than assuming one material is universally better.
Installation and corrosion checks
Before installation, remove the wheel and clean the mating surfaces. Pay particular attention to the vehicle hub pilot, the wheel bore, and the wheel mounting face. A wire brush or suitable cleaning method may be used carefully to remove loose corrosion, but do not remove metal or alter the hub geometry.
Test-fit the ring before mounting the wheel:
- Place the ring in the wheel bore or onto the hub according to its design.
- Confirm that it seats fully and evenly.
- Check that it does not rock, bind, or sit proud of the mating surface.
- Mount the wheel and verify that the wheel contacts the vehicle mounting face without interference.
- Install and tighten the correct wheel fasteners using the vehicle or wheel manufacturer’s procedure.
Do not use excessive force to install a ring. If it will not fit, recheck the dimensions, profile, and surface condition. Do not grind the ring or enlarge the wheel bore as a substitute for confirming fitment.
After installation, inspect for gaps, trapped debris, or signs that the ring is preventing full wheel seating. Tighten the wheel fasteners to the specified torque with the vehicle supported as required, then recheck torque according to the applicable service instructions.
At future wheel removals, inspect the ring for cracks, distortion, corrosion, or seizure. Clean the hub and ring before reuse. If corrosion makes removal difficult, resolve the cause rather than forcing the wheel or ring apart in a way that could damage the hub.
Product-selection checklist
Before purchasing a 73.1 mm to 57.1 mm hub-centric ring, confirm all of the following:
- The wheel center bore is 73.1 mm.
- The vehicle hub pilot is 57.1 mm.
- The ring specification identifies 73.1 mm as the OD and 57.1 mm as the ID.
- The ring profile matches the wheel bore and hub shape.
- The ring has adequate axial engagement and will not hold the wheel away from the hub.
- The stated tolerances suit the measured wheel and hub.
- The material is appropriate for the vehicle’s heat, moisture, salt, and service conditions.
- The wheel’s bolt pattern, offset, load rating, fastener type, and brake clearance have been checked separately.
- The ring and mating surfaces can be cleaned and inspected during installation.
For this specific dimensional requirement, the essential order is wheel bore first, vehicle hub second: 73.1 mm outside diameter × 57.1 mm inside diameter.
