Hello. I was wondering how the bike got its shape. On modern TT bikes, the wheels are designed to create a laminar flow through them, and thus are shaped how they are. I was wondering why the frames are not completely covered. I would think that that would improve the aerodynamics, because the airflow would be parted once, rather than at the fork, and then again at the seat tube. Is is a UCI rule for bikes, and therefore, the manufacturers don't bother to test new designs?
Thanks!