Oh, I almost forgot. The thing that drives this is a LOW seat height to get out of the wind. I think it is about 17" above the ground. This corroborates desired values on the FFWeb discussions from those who've experimented and now know. Apparently the sweet spot is like 12"-17". But much lower than 17" runs into clearance issues with the swingarm with motorcycle wheels and adequate suspension travel.
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Good design is simple. Getting there isn't.
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