Please correct me if I'm wrong about this but my understanding is that one of the major components of an aero bike fit is a flat back meaning the riders back is parallel to the ground. The two factors that dictate back angle would be effective seat tube angle and hip angle. The slacker the seat tube angle the more acute the hip angle needs to be to achieve a flat back. So for even a fairly aggressive seat tube angle of 80 degrees would need a hip angle of 80 degrees to achieve a perfectly flat back. That hip angle is pretty far from the recommended 90-105 degree angle and for me at least would result in power loss and comfort issues.
What I'm trying to figure out is why/why not setup with a super aggressive 90+ degree seat tube angle so you can have a flat back and maintain an open hip angle. It seems like the best of both worlds, an open hip angle that feels relaxed but the aero benefits of a flat back. Has this ever been tried? Any data or opinions on it?
What I'm trying to figure out is why/why not setup with a super aggressive 90+ degree seat tube angle so you can have a flat back and maintain an open hip angle. It seems like the best of both worlds, an open hip angle that feels relaxed but the aero benefits of a flat back. Has this ever been tried? Any data or opinions on it?