Originally Posted by amyd
A "lot more efficient" than what? A typical rear wheel drive recumbent, absent of idlers and tubes, isn't anymore inefficient than an upright, so what, exactly, are you comparing your assumptions to?
With a long drive train it is more difficult to resist flex. With a short compact one, structured as a tetrahedron as per a diamond frame bike, flex is no longer an issue. That is where the added efficiency comes from, when compared to other recumbents. It is not more efficient than an upright.
I think now that your theoretical understanding of how a cruzbike is developing, it might be time for you to get some actual experience with one, and put some reality behind your opinions.
