Thanks for this. Clearly there are compromises between
Comfort,
Aero, and
Power
In reply to Matt. The position looks ok.
Your torso is almost horizontal. neck tucked into the shoulders. I can't see how arched your back is from the picture however as it's cut off.
I think just as important as the relative positions of contact points is the flexibility of the rider and the shape they create with what they've got. The flexibility to rotate the torso forward is important. If you don't have this move the seat forward. Secondly, pull your belly button towards the top tube, helping to flatten the back higher up.
Now this is an interesting point. I'm conscious of this open-hip-angle business i.e. too small a hip angle will limit your power. I stumbled on a tri setup vid earlier which recommended bending at the navel; this sort of seemed sensible, but gets away from "flat backs", and contra to your
pull your belly button towards the top tubeI'm certainly more comfortable with a bit of an arched torso, legs feel less constricted. Flat backs reduce frontal area, but I need power ...
I've also read about a box-shape i.e. hip angle and shoulder (torso-upperarms) angles of 90'. This was also aimed at Tri riders, who need more comfort for their longer efforts.
Also tilting the bars up a little may be more aero, just 5-10 degrees above horizontal. The UCI have banned the praying mantis position where the forearms point up, so it must be good!!
Now you mention it, I did the 24h with much higher hands, so I'll try that again - nice one.
My main thought on the bike is that I may need my elbows nearer to me (the 90' shoulder angle thing). Purely for comfort, not aero. My stem is miniscule already! Not sure how far back other bars could put the arm-rests.
Food for thought ...