Originally Posted by
asgelle
What do you think is stopping the rider from going really fast?
Given a certain watts/kg, a smaller rider averages lower absolute wattage. On the flat, you need absolute wattage to overcome drag, and your lower weight doesn't help you.
This is the reason heavier riders do better at races like Paris-Roubaix and other classics, because weight doesn't matter that much on the flat, and they can push a much higher absolute wattage.
Of course it is possible the OP can do 5 watts/kg on the flat, and he would definitely benefit from an aero setup. But at 2 or 3 watts per kg and being 60 kg, you'd be doing 120 to 180 watts on the flats. That is not enough for aero to matter much.
And again, bike frame is the least important in terms of aero gains. Work on your position for free, and get a 100$ aero helmet.