Several reasons. The more original narrow fronts were vegetable tractors, made for working rows of vegetables in a truck farming envirionment. But the sngle fronts couldn't really support heavier implements, so the two wheel became popular, as much for flotation as for implement weight. Row crop farmers preferred the narrow front for working corn because of the tighter turn radius and sight line of the work at hand. Plus, they were very handy for backing wagons and towed equipment into buildings and barns and were somewhat cheaper to purchase initially. As the machines have gotten heavier, the wide front is most common now because there isn't as much torque on the frame, which has caused more than one to break after use from the leverage difference caused by the narrow fronts. That's from the pivot poit being much closer to the main frame- a narrow front naturally places more twist on the frame, especially with higher horsepower and weight. The stability is somewhat of an issue, but common sense operation of the machine also has a large role in safety. Any tractor can be rolled on a slope or flipped over backwards in certain situations. Personally, I have two narrow front tractors now, and still prefer them for most jobs around my place, even with the hills. But most were discontinued around 1975 as fewer farms worked corn and Ralph Nader became famous for sueing the makers.
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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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