As a long time student of researching and wondering about the fantastic development of antique bicycles and learning something new almost weekly for decades as a member of The Wheelmen. Seeing 2 speed, hearing about a 3 speed and seeing a advertisement for a 4 speed shaft drive bicycle, I pose the question that I don't think is out of the possibility of mechanical design that could have happened, DID A SHAFT DRIVE TANDEM BICYCLE EVER GET PRODUCED?
Mike Cates, CA.