Belt drive
Just found a link to the Hettlage Belt Drive. It's a terrible web site and doesn't answer many questions at all, but the idea of the gearing being achieved with a variable diameter pulley is pretty interesting. I think I'd still prefer an internally-geared hub though.
Some more info here. They say it's about a 240% gear range.
Some more info here. They say it's about a 240% gear range.

2 Comments:
Interesting
Great post. I especially found it useful where you stated ...
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katarashop
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