Interesting picture. Starting about 1930-1934 the AC company re-geared some Model U's with higher road gears capable of running 40-45 mph around a track. There were country tractor races scheduled at State fairs and small towns in the Midwest that had race tracks. This was a marketing deal to promote rubber tired tractors.Difficult to say tread design but your picture may show original design used on these tractors.Barney Oldfield was hired as one of the tractor drivers and he always won. This probably helped AC tractor sales as much or more than the tire company.There are pics of these old tractors on some websites, but I can't determine the tread design from those pics, they are going too fast.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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