Because a light bike is an advantage in a race. It accelerates quicker, and takes less energy to ride uphill.
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No, that is just silly. It does not. If you doubt this just find pictures of professional bike riders like Lance Armstrong. He is very thin and has riden bikes for over 20 years.
This can not be answered because has never been accuratly calculated
Neil Armstrong said , It is a very quiet ride.
Where you ride a bike that only has 1 wheel.
It was a very quiet ride.