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Thrasher-
a lightweight bike weighs 6.5 kilo, a heavy bike 8. An average rider weighs 75 kilo, his outfit 3 kilo, his drinks 1 kilo. All together that's an advantage of 1.72% for the lightweight adept. For pro's that's significant, for most of us that's negligible as we loose more time due to bad physical condition.
Stronger argument? ;-)
WimVDD
have you seen the gradient on tracks?
and you have to go down that hill aswell...