Originally Posted by
JohnDThompson
Yeah, they work. But you don't have any control over the shift points. And the mechanism adds a lot of weight and complexity to the bike. All in all, a solution in search of a real problem.
Fixed it. We see them from time to time at my co-op. The rear wheel weighs in at around 10 lbs. I think the frame is made from surplus dwarf star metal that was once used to make Schwinn Varsity frames. These things have a noticeable gravitation pull.