I had a look at these antique bikes today, and found out that there is still a number ("a number" is very imprecise, but definitely tens, if not hundreds) of people who rides them.

So this intrigued me, and what I don't quite understand is: do these have some sort of freewheel mechanism in the crankset itself? What is the stoping-starting technique? And how exactly are you supposed to turn? I guess you can do that by changing the baricenter, but you sure can't make sharp turns that way, can you.

In any case, a very interesting kind of bicycle. Hey, maybe it fits right in the singlespeed movement