Yellow jersey of overall leader, France' [Getty Images]

Yellow jersey of overall leader, France's Thomas Voeckler, rides at the Casse Deserte pass in the 200,5 km and eighteenth stage of the 2011 Tour de France cycling race run between Pinerolo and Galibier Serre-Chevalier ski resort on July 21, 2011. This year is the celebratation of the centenary of the first crossing of the Galibier pass by a cyclist on July 1911 during the Chamonix/Grenoble stage of the Tour. AFP PHOTO / JOEL SAGET (Photo credit should read JOEL SAGET/AFP via Getty Images)

AFP JOEL SAGET