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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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