Originally posted by lostmyshape
weird... interesting idea... so let me see if i understand what these do. they shift the angle of the cranks depending on their position so there is never a time when both are vertical (at the 12 and 6 o'clock positions)?
hmmm... seems to me that these would be revolutionary if we ONLY put a downward force on the pedals. in that case, at the position these cranks eliminate, we'd only be applying force to the BB and none would go into turning.
but, isn't this why we attach our feet to the pedals? so we can more effectively "aim" the force we exhert in a circular motion? if that's the case, the problem that the rotor cranks eliminate doesn't really exist in the first place.
admittedly there is a dead (or more accurately, a weak) spot in a pedal stroke, but would these cranks help significantly? they claim they do, but why isn't every pro using them, then? i'm skeptical, but it is an interesting engineering solution. my guess is these are not significantly more efficient than standard cranks, though. any engineers want to weigh in on this?