one of the most impressive performances I have ever seen on a bike, is Cancellara in 2008 Tour de Suisse, stage 9 where he was off the front in about the last 7kms.
http://www.youtube.com/watch?v=iWljwietzYo
compare the upper body and technique.
I know the reference, is:
(1st example)au bloc, over the last 7 or so km,
versus
(2nd example)the last 50km in Roubaix or last 30km in Flanders.
So, I acknowledge, he might be putting out, 550 watts in Suisse over only 8 minutes, versus 500 watts in the monuments. But one was riding away from classics riders, one was riding away from a Protour peloton on a flattish stage (which ofcourse, requires a massive effort, but not in the mode of the monuments)
opinions?