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 - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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