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It sounds awfully complex. And I worry that adding yet another step into the drivetrain is just one more little drain on what is a very small resource. When all you've got is humanpower for motive effort, I say the most direct transfer of power is the best option.
Have you read about the NuVinci CVT? I don't remember what the efficiency numbers are but they're pretty good, and it's small enough to be a relatively unobtrusive in-hub installation.
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Lead or follow. Either is fine.
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