There have been several other similar approaches using basically the same principle, typically six idlers which expand radially and replace the chainset. I recall seeing one on Tomorrow's World, probably 45 years ago!
What happens when non-cycling engineers get involved.
Pretty much every engineer who sees my mech’ collection goes on to say how superior epicyclics’ are to the crude, ill-conceived derailleur. Well sure in theory (and certain applications) they are - but in the real world where cost, simplicity, reliability and weight are factors, the modern refined derailleur is hard to better.
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