If you want 19.5 tires get the 19.5 rims.
I am running them on my truck with Goodyear G171 8R19.5 tires, they are all steel (except for the rubber part) and have about the roughest tread I could find in that size and at a very reasonable price.
So far I have been very happy with them.
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-