We recently purchased a 1979 Twinn Sport. I have several questions regarding the wheels used on these bikes. It seems that the front wheel hub spacing is 92.5mm, is that possible? Is that normal for a tandem? Peculiar to Schwinn tandems? Rear spacing seems to be 146mm which seems common for other tandems. I have now had the experience that others have had regarding tires slipping off the steel rims and consequent exploding tube. I have several alloy front wheels with hooked rims but they won't presently fit in the fork, could I maybe alter them to the spacing required? We really wanted to try this tandem out without having the wheels relaced to better, lighter rims. I would really like a better front hub, the rear has an Atom drum brake I would like to keep. In the long run I will probably fit Tektro long reach rim brakes front and rear and maintain the Atom as a drag brake for long downhills activated by a friction shifter.
All comments appreciated.