Originally Posted by DannoXYZ

Using power-to-weight ratio might be a good indicator for hillclimb or sprinting-acceleration performance. But for flat-line and TT performance, you want to use power-to-AeroDrag ratios. You want to pack as much power into as small of a package as possible for straightaway speed. That's why time-trialers have such cramped and inefficient positions that doesn't generate the most power. However, even at producing 95% of possible max-power, triming down aero-drag to 90% will give you much faster speeds than producing 100% power at 100% aero-drag.