Originally Posted by CdCf

I don't know what you're talking about now. What I mean is that body size and maximum sustained power usually follow each other up. A 180-lb guy (not fat) would very likely be able to put out a lot more power than a 130-lb guy. The difference in frontal area, however, would not be that much greater for the big guy, so he'll be faster on flat ground and low inclines.

As the incline gets greater and greater, power to weight becomes more important, and this is where the small guy will be faster.

Edit:
dmotoguy seemed to understand my post.