Tejay van Garderen of the U.S., right, and Netherlands' Laurens ten Dam, left, speed down Val Louron Azet pass during the seventeenth stage of the 2014 Tour de France on Wednesday, July 23, 2014.

Fans crowd the dirt road to the Colle delle Finestre as race leader Alberto Contador climbs during the 20th stage of the Giro d'Italia, Tour of Italy cycling race from Saint-Vincent to Sestriere, Saturday, May 30, 2015.

Colombia's Nairo Quintana rides during a training session two days before the start of the Tour de France cycling race near Utrecht, Netherlands, Thursday, July 2, 2015.

Spain's Joaquim Rodriguez, left, leads Poland's Rafal Majka, center, and Luxembourg's Frank Schleck, right, climb towards Saint-Lary during the seventeenth stage of the 2014 Tour de France on July 23, 2014.

2014 race winner Vincenzo Nibali of Italy, wearing the overall leader's yellow jersey, second placed Jean-Christophe Peraud of France, left, and third placed Thibaut Pinot of France stand on the podium of the Tour de France in Paris, France, Sunday, July 27, 2014.

Team Sky cycling team rider Chris Froome cycles during a training ride during the Team Sky Media Day in Alcudia, Majorca, Spain, Sunday Jan. 11, 2015.