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 - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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