Originally Posted by
RobbieTunes
These days, almost everything, because it's not only about aero (there are better aero bikes with TT bikes) but position and being able to conserve parts of your body for the run.
Can you be more specific about the differences? I'm not interested in a comparison of a Centurion Ironman with today's road bikes made of plastic (i.e., carbon fiber), but with a classic steel frame road bike.