Old design
I always thought that amazing nobody has improved on the diamond triangle design of the bike frame. Aerodynamics play a huge roll at speed. Your body being the most wind resistance. But the comment about rough roads being a problem or hills , can not be dismissed. Yes you are way more aerodynamic, but you can't stand up or bunny hop over bumps. Yes the recumbent takes pressure off your crotch witch is good. I still think there may be a different design to come like a cyborg type with wheels, that let both your upper and lower body propell you. Just wondering if anything like that has been drawn up yet.?