Leisesturm

I would too. That is one sweet bike. 406 rear wheel would NOT improve aero! Only if YOU weren't there, but you are, and the rear wheel is in your wind shadow so the full size rear wheel is not an issue and your gearing and tire choices improve. Where do you find oval chainrings bigger than 50T? How much do they cost? Short cranks are for if you have a problem with heel strike against the front wheel which should not be the case with a 406 front wheel. IF you shorten the cranks then you should also lower the gearing, most people don't do that. They just use 155mm cranks with the same gears that the rest of us use 170mm cranks to turn and then wonder why their knees still hurt, or why they are still so slow. BTW a standard bike can be out of UCI compliance for various reasons. A recumbent isn't UCI compliant. Period. Once you are on a recumbent you are dead to the UCI. Most of us don't care. The Stringbike drivetrain still has rotary motion of the cranks. It has all the disadvantages of being way more complex and fragile than a bicycle drivetrain needs to be, heavier too, probably. But that is just first impressions. It looks interesting. I am going to study it some more. Linear pedal motion is useful if you need your foot motion to stay inside the confines of a fairing. Consider however: year after year, the fastest recumbent in the world is what amounts to a drop dead simple Easy Racer (LWB) recumbent inside a carbon fiber shell. You wouldn't kill yourself if you tried to ride it around town but if you fell over for whatever reason getting back up again would not be quick, or easy. But have you seen a streamliner? More information available here. I don't think there are that many on the road and they don't look cheap but the idea of a two wheel recumbent in a shell being ridden on public roads is intriguing to some.