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Martin has and 11 tooth 20dp gear and a 10 tooth 20dp spline shaft. We used them both this year.
This was one of our "lessons learned" from 2003: leave yourself enough center distance to vary a wide range of gear ratios after the output shaft of the shifting gearbox.
From the output shaft of our gearbox, we had a coupler, a gear reduction, and then our drive wheel. This gear reduction started out as 2.5:1, but it ended up being 4:1, using a 41 tooth gear (custom) and a 10 tooth gear. I wish we knew we needed a 4:1 when we set the center distances of the gears... they would've been farther apart. This mistake was the cause of many mechanical breakdowns (3 in Pittsburgh and 1 in Chicago).
Andy B.
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