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."
Thank you for that link.
@mespilus started
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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."