MONT VENTOUX, FRANCE - JULY 14: Richie Porte of Australia and SKY Procycling leads team-mate Chris Froome of Great Britain up the climb during stage fifteen of the 2013 Tour de France, a 242.5KM road stage from Givors to Mont Ventoux, on July 14, 2013 on Mont Ventoux, France. (Photo by Bryn Lennon/Getty Images)

MONT VENTOUX, FRANCE - JULY 14:  Richie Porte of Australia and SKY Procycling leads team-mate Chris Froome of Great Britain up the climb during stage fifteen of the 2013 Tour de France, a 242.5KM road stage from Givors to Mont Ventoux, on July 14, 2013 on Mont Ventoux, France.  (Photo by Bryn Lennon/Getty Images)