I can agree with your presumption on the geometry of what happens when the center of gravity falls outside the footprint on any tractor, but I'd challenge (over a beer and in a friendly fashion!) the assertion about the B being discontinued because of tipping problems. I dont know that the Bs or even the BNs had any kind of reputation for being tippy and, even if they did, I can't imagine that IH tried to"fix" that by replacing it with the C (many, many of which were built with narrow fronts), which centers its weight even higher with only and extra 6" of wheel width?? Leaving the 100" axle option out, the tipping geometry is only worse, but still not inherently unsafe.
I'd argue that the A (or the Cub or any offset tractor) even with it's wide front was inherently "tippier", especially to the left side, than any narrow front where the center of gravity is basically along the centerline of the tractor. Even with the advantage of the extra weight of the longer diff shaft and housing on the right, the As were commonly sold with a stamped steel wheel on the left and the heavier cast wheel on the right, just to move the center of gravity away from that narrow left side. If tipping were the driving issue, they'd have abandoned the As, not the Bs.
My view is that they kept the A as their small, truck farming tractor. For the C, they simply regeared (including the big rubber gears on the 36" rims) to build tractor with the same motor as the B that would pull a heavier load. The other good reason for them to have kept the A is that they were selling scads of them for mowing roads and ditches, being that the short left side didn't hang out into the travel lane as much.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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