Just found some info on wheel and hub fit.
SAE standard J694 revised 2001-02 β€œDisc Wheel/Hub or Drum Interface Dimensions – Commercial Vehicles β€œ

10 lug with 7.25” bolt circle.

Bore in wheel:
Steel, 5.251/5.261”
Aluminum, 5.251/5.254”

Hub pilot diameter:
5.245/5.250”

Pilot length:
Single, 0.28”
Dual steel, 0.52”
Dual aluminum, 0.85”

Those dimensions will be useful if either boring older wheels with the smaller 4.75” center bore (or older and smaller) to fit the ~1955 and later hubs with 5.25” pilot.

Also, if making bushings to adapt later wheels to older smaller hubs you would shrink fit steel bushings on the hubs and ensure the OD is as listed, and suggested lengths.


The standard was first issued May of 1955, so earlier revisions may or may not have similar tolerances listed for the 4.75” center bore wheels and matching hubs, as about this time GM switched to 5.25” bore. I don’t have an earlier copy.

β€’1951 GMC 250 in the Project Journals
β€’1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
β€’1952 Chevrolet 3800 pickup
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