I know obviously that the climber climbs better and the All-runder is better at TT, but what causes the difference? Weight is one factor and that can explain why Cancellara is a great TT, but bad in real mountains, but what about people like Cadel Evans vs. Andy Schleck? CE is clearly better in TT, but they weight roughly the same. Leipheimer is another example of an all-rounder who weight little enough to pass for a climber. So does anyone know what the difference is? Is it physiological, technique, both or something different?