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Tour home Preview Live coverage Stages Startlist Photos Features & Tech News Map FAQ Tour history 2003 Tour Recently on Cyclingnews.com Mont Ventoux Photo ©: Sirotti	Tour de France tech, June 29, 2004 Air flow over a straight-sided 60mm rim - drag is caused by the air flow separating off the tyre Photo ©: Zipp Previous photo    Next photo Latest Photography  Related Story

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