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Tijs-
Why aren't the cranks reversed?
The crank phase is normal, anything else would be unusual but not unheard of.
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I think I have the answer (thanks to @ceramique) : the cranks are reversed to reduce bb twisting in the frame. In a "classic" tandem, first and second chains forces add up and impose a greater twist to the rear bb. On a Follis, both of chains pull the bb backward so there is no twist. @mdcc_tester
gbj_tester
mrboulard
N+1 ? N+1/2...