The reason large tires are hard on spindles is because they move the center of ground contact out from directly in line with the axis of the spindle. It means more steering effort is needed because you now have to turn the tires in an arc rather than just pivoting on the ground. More importantly, it moves the center of the load out away from the larger inner bearing. The load is no longer applied directly up through the spindle axis but now is offset and results in a lever affect at the spindle joint. The larger the tire the more offset the load becomes. That is what causes the spindles to break off just inside of the inner bearing.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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