The first gear in most all gear drive cubs is 13 teeth, The early tractors had a 16 tooth 2nd . Later they went to a 19 tooth 2nd, and some had a 17 tooth 2nd, Usually the lower horsepower engines had a lower 2nd gear. 3rd gear is a 26 tooth gear. It takes a little more power to mow with a 19 tooth 2nd gear. All the 1200s that I worked on had a 17 tooth 2nd, 108/128/102/122 had a 19 tooth 2nd, and the early 100/70/72/73s where a 16 tooth. Anything less than 14hp I would want the lower gears. But I prefer to mow with a hydro.
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