The standard tire on the H and M was 38". I have an original brochure that states 10-38 for H and 11-8 for M. I can't speak for the factory putting on 36" tires, but I wouldn't be surprised if some of the steel-wheeled tractors were converted to 36, because this was a very common tire size in the late 30s. The F-20 usually had 36" rims on rubber, and I definitely remember F-12s with 36," point being that this was a commonly available tire. My father's 1938 F-12 came from the factor with 38" rears, and I do think that was the most common size for this tractor.
From my original IH brochure for H and M:
At 1650 full-load rpm for the H: 4th 5-3/8 mph 5th 15-5/8
At 1450 full-load rpm for the M: 4th 5-1/8 5th 16-1/4 The brochure does not give the tire size, and it does not actually state that the speeds given for gears 1-4 are on rubber. It does make it clear that fifth is available only on rubber (you probably know that fifth was "installed" just by turning out a little bolt in the transmission cover--when turned in, it blocked the shifter rail from moving forward into 5th!). The no-load speed for H is 1815 rpm and for M is 1595 rpm. In both cases, this is 1.1 times the full-load speed. You can multiply the full-load ground speeds by 1.1 and probably come pretty close to the no-load speed. What others say here about the huge gap between the gears is right. The H, especially, desperately needed another gear between 4 and 5. On a gravel road with a wagon-load of hay or grain, the tractor would not pull the load at 5 or 6 mph in fifth, and in fourth, you got under 6 mph with the engine roaring away like a race car. Most of the tractors of that era were later re-tired with wider treads, for better traction, and there may be some slight variations in ground speeds because of that.
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Today's Featured Article - Uncle Cecil's Super A Lives Again - by Mike Purcell. A week or so out of most of my childhood summers was often spent with my Uncle Cecil and Aunt Sissie in the small East Texas town of Maydelle on their 80 acre farm. Some of my fondest memories of these visits are those of learning to drive a tractor at the helm of Uncle Cecil’s 1948 Farmall Super A. Uncle Cecil was the second owner of this wonderful little tractor, but it was almost as though he had adopted an infant. The original owner was a man from Minnesota who bought her from a local dea
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