There is a "clamp on" dual that, as the name implies, employ clamps to affix them to the inside set of tires. They are used with flange axles. If the tractor has bar axles that are long enough, then a complete wheel/tire/hub assembly is simply slipped onto the end of the axle. Another method is to use a bolt on hub for the dual. Duals are especially useful in high HP 2WD tractors in order to get all that HP to the ground. Also for flotation, as mentioned, in both soft ground conditions and for cultivating row crops with big cultivators. Downside is their increased "rolling resistance" which eats more fuel. If you don't need them in a particular situation, then you're better off removing them. For cultivating, it is common to see duals, front and rear, set to track in between the crop rows. That keeps compaction down that can be caused by the combined weight of the cultivator and the tractor and also the spray tank/s that may be carried as well, usually on the sides or front of the tractor.
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Today's Featured Article - Chores - by Frank Young. The ceaseless passing of time! It is at once our friend and our enemy. It measures our progress and it makes us old. Like most features of our life, few things are all good or all bad, and most such judgments depend on our own perspective or viewpoint. In our particular hobby, we enjoy the nostalgic return to the days of our youth as we recreate many of the scenes that took place on the family farm that served as the stage for the first few acts of the play that is our live
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