Originally Posted by
x136
Uhh, it looks like the seat tube/crank assembly floats inside the rest of the bike. That chain tension is going to be a ***** to maintain. Extra-tight tension on the way up a bump, and then the chain falls off on the way down...
Top and bottom cables maintain the whole diamond frame rigidity. The only new thing with his "concept" is the newer materials used in its construction. And I'll bet that if we scoured the design schools across the country, this very design has been done before as well.
My above pic shows a bike that was actually raced in the late 1920's.