Quote:
Originally Posted by flecc
Yes, it is clever John, the brainchild on one Austrian man, Florian Schlumpf.
It's rather a pity that they are so expensive since they could have a much wider market, although the drag is noticeable. One sector that uses them is on recumbents, where a triple chainring is an awkward thing between the lower legs.
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I'd have one if they were cheaper to improve the ratios available for hills, I guess the direct drive gear is almost 100% effcient.