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Interestingly, Shimano set their high-effort zone at the 'dead spot' , while Rotor and other companies set the low-effort zone at the 'dead spot'.
I think its worth a revisit. I'm thinking to conduct several on the road tests with 3 rings - ROTOR, BIOPACE and ROUND. TT TEST, HC TEST and ROULER TEST. The protocol is very simple - I'll use a PT Wheel for data aquisition , then compare results of power vs. time.
Plan B is to use it single chainring with an Alfine hub in the back.