According to the Tire and Rim Manufacturers Association, every tire has an approved rim width on the post 1954 tire sizing. Typically a rim one inch narrower than the tire cross section until you go larger than 16.9x38, which still needs a very hard to find 15 inch rim. The next larger tire, 18.4 takes a 16 inch rim and 15" is an approved alternate. 20.8's need 18" rims, 23.1's use a 20" rim, 24.5's use a 21 inch rim, and 30.5's use a 27 inch rim. Going down in size, a 15.5" needs a 14 inch rim, a 13" would be first alternate. A 14.9 needs a 13 inch rim and 12 inch first alternate. 13.6 needs 12" rim and 11" first alternate. 12.4 needs 11 inch and 10" first alternate. 11.2 takes 10" and 9" first alternate. I think the "New size" for the old 9-38 is a 9.8x38, on a 9 inch rim, and 8" first alternate. We had a '40 JD B with 9-38 tires.
If you do a search on FIRESTONE COMMERCIAL tires you will get to a page that leads you to ag tires, may take a couple tries, I gave advice to FIRESTONE how to make their farm tractor website more user friendly, and they actually used a couple of my ideas. It's easier to navigate now than it was before. But ALL that information is available. I have tire data books for Good Year, Goodrich, Firestone, and Armstrong from my days at FARMALL buying tires. They all have static loaded radius, flat plate contact patch, etc.
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Today's Featured Article - Chores - by Frank Young. The ceaseless passing of time! It is at once our friend and our enemy. It measures our progress and it makes us old. Like most features of our life, few things are all good or all bad, and most such judgments depend on our own perspective or viewpoint. In our particular hobby, we enjoy the nostalgic return to the days of our youth as we recreate many of the scenes that took place on the family farm that served as the stage for the first few acts of the play that is our live
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