The chart is just great! Did it come from an IHC publication? When I was about 12, I often used a relative's F-20 on 36" rubber. I knew that 36" tires would make the tractor much faster than the original 40" wheels. The big wheels were needed to clear the brake drums. Whenever this tractor was equipped with smaller tires, the wheels had to be turned out, making for a very wide tractor.There was no easy way to measure the speed, so I compared it in my head to tractors which had speeds I knew from their specifications. The F-12 was supposed to do about 3 mph in second, and that was about what the F-20 did in first. The F-12 was supposed to do about 4 in third, and one time, I had my brother drive the -12 while I went side-by-side in second on the F-20 (very similar speeds).
One of the really obvious results of this increase in speed on 36" rubber was that even in low gear, the F-20 was sometimes too fast for the PTO-driven 42R combine we used, if there was a sudden increase in the volume of grain going in. It is fascinating to see these numbers, because during those years, when I was pretty nuts about tractors (well, more than now, anyway), I made up my own estimate of F-20 speeds on 36" rubber: 1st 3 mph, 2nd almost 4, 3rd about 4-1/4 and 4th a little over 5. These turned out to be fairly close to the numbers in this chart. We can assume that the ground speed would vary a little bit when the tractor was under load or running free at high-idle speed.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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