A powered wheel going through dirt needs an angled cleat to,push the soft stuff aside and get a bite on firm stuff.
So the very basic design of an angled bar is going to be best in those situations. They figured that out pretty early on.
There have been 100s of different patterns from all one angle, to overlapping herringbone bars, to different angle degrees. They probably all look the same to you, but they are very different and has been an ongoing development to get to the best tread design.
Complicating it is different needs: what works well on plowed dirt is different than what works best on notill dirt compared to what works best on alfalfa and hay grass dirt.
Then if you travel on a lot of pavement tire wear is a concern, and you might want a pattern that isnt perfect on dirt but doesnt wear quite as fast. A compromise.....
Then you need compromises when you do several different things with the same tractor.
So there is room for many different patterns still, and room to develop more.
I have not seen the same perfect tire design for decades? Lots of changes and progress.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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