Posted by LenNH on November 23, 2009 at 13:29:20 from (71.192.137.159):
In Reply to: F20 reqr tires posted by Milan R on November 20, 2009 at 19:40:53:
38" tires are certainly possible on an F-20, especially if the original steels were cut down to that size, but the usual factory size was 36". There was also the option of 24" tires, but the rims don't clear the brake drums and the wheels have to be turned out. VERY wide. The 36" tires were obviously chosen to allow the rims to clear the drums. The original steels were 40", so you get a big change in diameter when going for 36" rims (rim diameter + tire diameter). Ground speeds are faster than original. I never got a chance to do a "scientific" test with an F-20, but I once ran one on 36" in second gear, neck-and-neck with an F-12 in third (about 4 mph). One of the results of using rubber is that a lot less power is wasted, so it was like being able to plow in a higher gear (that is, 4 mph with the same plow that you could pull only at about 3 mph on steel). I've done a lot of work with steel-wheeled tractors, and those lugs waste a lot of power. They won't pull their "rated load" much beyond 3 mph.
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