Originally Posted by
mr_pedro
I do see big heavy guys doing 20+ mph on flats, but they are never fat. Next to impact on aerodynamics, excessive fat must also hurt the ability to produce large amount of power for long time on bicycle. Maybe because it becomes very difficult to remain stable in the saddle while doing 90-100 RPM.
I wouldn't say "never'. I've ridden with a few fatties who could roll. There aren't a lot of them, but I've met enough to never take it for granted that a beer belly means a slow biker.