bias, are cheaper that radials, Radials are only worth the money if the tractor is going to be used for higher draft loads or you are looking for floatation, and you must be prepared to air them down to make them work regardless of what your neighbours say/think... own 180hp fwa runs 8 psi in the rears 480/65r42, and the neighbours 900 metric radials are under 5 psi.
lugs, wider spaced lugs allow for better self cleaning, but wear poorly on road use, goodyear used to make a dt810 radial, had a 2 piece lug on each side of the centre line, they wore very well, and we great in hard dry conditions for traction, but god help you if it was wet or slippery...
if you want floatation then the rule of thumb i use is to have at least 3 lugs touching the ground at a time... i've never seen any sort of formula for weigh/hp/tire size, but as i understand it, taller tires have less rolling resistance, narrow tires provide less floatation to cut down through mud to a firm base (if there is one) while wide tires provide floatation...
i currently run a set of trelleborgs on one tractor, and very happy with them, a set of mitas tires on another and very happy (these replaced the aforementioned goodyear dt810s), i have used michelins, but they are very $$$ and we had puncture problems with them on the loader tractor
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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