Aside from the reasons given below, large diameter tires with no more rubber on the ground than small diameter wide tires, give better traction and more flotation. My dad saw this 60 years ago, traded a W4 with 14x26 tires off for an H with 11x38, very close to the same square inches of rubber making contact with the ground, both tractors having basically the same power train, yet the H was all over the W4 on drawbar pulling on soft soil. Basically a field situation across much of eastern North America, with annual rainfalls exceeding 36". You go to hard roads or the mid west to prarrie firm soils and rainfalls much less than 36" and the wide small diameter tire will do just as well. By the way those mid west to prarrie soils are firm because they don't have the rain fall.
Large diameter tires also do much better in sandy to sandy loam soils. That and the reasons others gave is precisely the reason why any given tractor has wheel and tire options. Depends on who buys it, and what they are going to use it for.
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Today's Featured Article - Tuning-Up Your Tractor: Secondary Ignition Wires and Distributor - by Curtis Von Fange. In our last episode we spent the entire day checking out the spark plugs. Is that efficency? Actually, it took more time to explain than it really did to do the inspection. At any rate we decided that a compression test was in order so we could verify the internal engine status. That way we wouldn't buy any tune up parts until we were sure that the engine was in reasonable mechanical condition. Our tests showed a fictional compression reading of 85, 80, 82 and 86 psi. That is well within a
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