I got my single-sided Rotor IN2Power directly from Rotor USA (I'm suspecting NOS, that is: discontinued) for $400. It runs on a single AA battery in the spindle, and the battery lasts something like 400 hours. The double-sided Rotor power cranks are indeed $$$.
When I went from the Gossamer to the Rotor, it was like riding a completely different bike.
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