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http://www.cyclingweekly.co.uk/news/product-news/usa-olympic-felt-ta-frd-track-bike-229573
"...according to Felt, is that bikes are faster when the airflow is coming from the drivetrain side, so as the air will always be coming from the left when riding anti-clockwise around a velodrome, it switch the drivetrain to that side."
pdlouche
mespilus
Noticed that,
and logged on to see who had the answer.
Must save some energy as the drive system does not have to be lifted so far up the sloping track.