[QUOTE=dfcas;5092673]
Originally Posted by
waterrockets
- you're not losing any power to frame flex.
Frame flex creates heat,and bicycle frames have no means to convert heat to power the rear wheel.
Differences may be small,but they must be there.
At that level, it's completely immeasurable, and by no means a criterion for frame selection. Aerodynamics of head tube badges vs. paint would make more difference.
Also, if you look at the practical options for going stiffer than the c'dale, you have to go with carbon. Carbon is an inefficient spring and will lose more of this immeasurable power. So a slightly more flexible AL frame may be microscopically more efficient than a stiffer CF frame.