First off, while the UCI specs don't apply to triathlon bikes, they still roughly have to. A lot of these bikes have aspects that once were legal by UCI rules a

First off, while the UCI specs don't apply to triathlon bikes, they still roughly have to. A lot of these bikes have aspects that once were legal by UCI rules at some point (although not sure about the "boom" bikes with no seat tube, but bikes like that were made by trek in the 1990s). The UCI is kind of like the Navy: there's a right way to design a racing bike, a wrong way, and then there's the UCI way. It has conservatism and history to be concerned about (bike racing is pretty old in Europe), keeping costs down for the lower run of even UCI pro teams (the female UCI teams can't even field a TT bike for all their teammates in TTTs), and there are durability concerns so bikes don't break and cause crashes in pelotons and the like, because there are already plenty of crashes. Triathlon isn't a big enough sport to have its own weird cogsets, wheel standards, etc, so they generally have to piggyback off what Shimano/SRAM/Campy make for the protour and general bike public. Now, I will say that my P3C with a disc and a trispoke front looks like an amazingly awesome back back when I did serious triathlons. Before children. Also, CFD will be what CFD is, the wind/fluid dynamics doesn't care about your superficial proclivities.