Probably from 35 to 42, the percentage on rubber from factory progressively increased as popularity took hold. This likely hit a peek prior to the U.S. entering the war. Then during the war (42 through 45), rubber rationing occurred. Percentage on rubber during this time went down considerably. You could still get rubber tires during this time, (IF) you could produce enough rubber ration stamps to do so. Not many could do that. The ones that did, likely used all of thier stamps, along with all of thier neighbors, family, and friends's stamps. Using any extra stamps they could find. Anyone without a car at that time, likely sold thier stamps to others.
After the war, the percentage of rubber basically went back to the peek it hit prior to the war, and went upward from there. Steel was not very popular at all following the war years. And production of the steel wheels continued to reduce for the rest of the production.
It's my belief that a higher percentage of the war time steel wheeled tractors were converted to rubber after the war, than the steel wheeled tractors produced before the war. People that got steel before the war, got steel by choice. Many during the war got steel but not by choice. Those people were more apt to convert, than the people before that had gotten steel by choice.
It's doubtfull that you'll ever find any real actual numbers. But if you kind of know what went on through those years, you can formulate your own opinion.
In general, rubber tires progressively got more popular starting from the early thirties. With the exception of the reversal during the war. By the time you hit the early to mid 50s, steel was basically all but completely phased out. About the only people still hanging onto the steel wheel concept at that point, was the ones that preferred those wheels for cultivating. And not many were ordering tractors to primarily only do just that. Most were going to also use the same new tractor to do other things. Therefor, didn't want to be burdened with the steel wheels just for cultivating.
As far as just the percentage from styled to unstyled?? The earlier unstyled seen a higher percentage on steel. This is figuring the entire run of production. If you isolated the war years, that number might be as high or higher. But the entire run of the styled on rubber, would over run the low war year numbers.
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