John and I are working on a wheel and tire Tech Tip for big trucks.

I think we have most everything covered except the "medium sized 10 lug" as I call them.
The bolt circle measures 8.75", and the center hole diameter is 6.25", they are Hub-Piloted.

I gather they came out in the 60's or so, and lasted for a number of years on 1.5 and or 2 ton trucks, but I really don't know.
I do know they were available in 20" 3 piece lock ring type, the two piece split in the middle dangerous type, and the modern 22.5" tubeless type.

That is where y'all come in, here are the questions we need answered:
1. What years were they used?
2. What size trucks used them?
3. What makes, Chevy for sure, GMC?, other brands?
4. Was there any make/model/year that is more likely, or the most likely to have the 22.5" wheels, or are all of the trucks covered in the answer to question #1 likely suspects for having 22.5 wheels?

As a prize for helpful information I'll show y'all where to get 22.5" wheels with this bolt pattern, other than the junk yard...

Thanks,
Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-