I've rotated Biopace chain rings 180 degrees to make them work with a Sugino crank. The spider was oriented 180 degrees away from the Shimano crank. I figure all this did was switch the primary power stroke from the right pedal to the left.
And count me among the fans of Biopace!
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You know it's going to be a good day when the stem and seatpost come right out.
(looking for a picture and not seeing it? Thank the Photobucket fiasco.PM me and I'll link it up.)