From hub bore and wheel centre bore, see whether a hub-centric ring is needed and which OD/ID to order — or if the wheel will not fit. Free, no signup.
Vehicle hub pilot diameter (mm).
Wheel centre-bore diameter (mm).
Hub-centric ring needed
Order a ring 73.1 mm OD → 56.1 mm ID. Rings center the wheel; they do not change PCD.
56.1 mm
Hub bore
73.1 mm
Wheel CB
Yes
Ring needed
Yes
Wheel will fit
73.1 mm
Ring OD
56.1 mm
Ring ID
8.5 mm
Radial thickness
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Enter the vehicle hub bore and the wheel’s center bore in millimetres (typical defaults 56.1 and 73.1). If the wheel is larger, the ring to order is OD = wheel bore and ID = hub bore. That is the aluminium or plastic spigot that keeps a lug-centric wheel from vibrating at highway speed.
If the two bores match within 0.15 mm, you do not need a ring. If the wheel bore is smaller than the hub, the wheel will not go on — a ring cannot fix that. Between those cases you get the radial thickness (half the difference) so you can sanity-check a catalog ring.
The output is millimetres to ask a parts counter for, not a promise that a specific Amazon ring is in spec. Always match the metal (or plastic) ring to both diameters. Bolt pattern and offset are separate: a correct ring on the wrong PCD still does not bolt up.
No account and no upload. Hub and wheel bores stay in the tab. Close the page and they are gone. Use Vehicle Fit when you need the OE hub bore for a year/make/model instead of measuring it. Nothing is stored on a server.
That is the raised center on the knuckle or drum, often stamped or listed as 56.1, 57.1, 66.6, and similar. Range is about 40–200 mm.
The hole in the back of the wheel. Aftermarket wheels are often 73.1 mm to fit many hubs with a ring.
Matching bores need no ring. Wheel larger than hub → order OD×ID. Wheel smaller than hub → it will not mount.
A ring only centers the wheel. PCD, thread, and ET still have to match. Pair this page with the bolt-pattern converter.
Straight answers on privacy, limits, and how the workspace behaves.
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