The 9.00X22.5 is the tubeless version of the 8.25X20, same diameter of tire but the rims are different. You cannot mount a tubeless tire on a tube type rim. Tubeless is the best way to go if you can find the rims.
James
1957 Chevrolet 6400 flatbed dump In the Gallery Webshot pix 1942 Chevrolet 1 1/2 ton 1962 Chevrolet M80 tractor