Britain's Chris Froome, wearing the overall leader's yellow jersey, is followed by Spain's Alberto Losada, Italy's Vincenzo Nibali and Spain's Alejandro Valverde as they speed downhill during the seventeenth stage of the Tour de France cycling race over 161 kilometers (100 miles) with start in Digne-les-Bains and finish in Pra Loup, France, Wednesday, July 22, 2015. (Photo by Christophe Ena/AP Photo)

Australia's Richie Porte, Colombia's Nairo Quintana, wearing the best young rider's white jersey, Britain's Chris Froome, wearing the overall leader's yellow jersey, and Italy's Vincenzo Nibali, from front to rear, climb during the seventeenth stage of the Tour de France cycling race over 161 kilometers (100 miles) with start in Digne-les-Bains and finish in Pra Loup, France, Wednesday, July 22, 2015. (Photo by Christophe Ena/AP Photo)

The owner of a dog has his dog wear a cycling cap of the best climber's dotted jersey as the pack passes during the during the seventeenth stage of the Tour de France cycling race over 161 kilometers (100 miles) with start in Digne-les-Bains and finish in Pra Loup, France, Wednesday, July 22, 2015. (Photo by Christophe Ena/AP Photo)

A spectator sits on a bicycle mounted on top of a French Citroen 2CV classic car as she waits for the pack to pass during the seventeenth stage of the Tour de France cycling race over 161 kilometers (100 miles) with start in Digne-les-Bains and finish in Pra Loup, France, Wednesday, July 22, 2015. (Photo by Christophe Ena/AP Photo)

A teammate helps Tejay van Garderen of the U.S., left, after he fell ill during the seventeenth stage of the Tour de France cycling race over 161 kilometers (100 miles) with start in Digne-les-Bains and finish in Pra Loup, France, Wednesday, July 22, 2015. Van Garderen subsequently abandoned the race. (Photo by Christophe Ena/AP Photo)

Spain's Alberto Contador's pants are torn after he crashed speeding down Allos pass during the seventeenth stage of the Tour de France cycling race over 161 kilometers (100 miles) with start in Digne-les-Bains and finish in Pra Loup, France, Wednesday, July 22, 2015. (Photo by Christophe Ena/AP Photo)

United States' Eric Marcotte pedals during the men's individual time trial cycling competition at the Pan Am Games in Milton, Ontario, Wednesday, July 22, 2015. (Photo by Felipe Dana/AP Photo)

Cycling supporters applaud riders as they cycle during the 161-km (100 miles) 17th stage of the 102nd Tour de France cycling race from Digne-les-Bains to Pra Loup in the French Alps mountains, France, July 22, 2015. (Photo by Eric Gaillard/Reuters)

Giant-Alpecin rider Simon Geschke of Germany climbs the Allos pass to win the 161-km (100 miles) 17th stage of the 102nd Tour de France cycling race from Digne-les-Bains to Pra Loup in the French Alps mountains, France, July 22, 2015. (Photo by Eric Gaillard/Reuters)

Team Sky rider Chris Froome of Britain, race leader's yellow jersey, is helped after crossing the finish line in the 161-km (100 miles) 17th stage of the 102nd Tour de France cycling race from Digne-les-Bains to Pra Loup in the French Alps mountains, France, July 22, 2015. (Photo by Stefano Rellandini/Reuters)

Spectators cheer Tinkoff-Saxo rider Alberto Contador of Spain as he climbs to Pra Loup during the 161-km (100 miles) 17th stage of the 102nd Tour de France cycling race from Digne-les-Bains to Pra Loup in the French Alps mountains, France, July 22, 2015. (Photo by Eric Gaillard/Reuters)

The pack of riders including Team Sky rider Chris Froome of Britain (L), race leader's yellow jersey, cycle during the 161-km (100 miles) 17th stage of the 102nd Tour de France cycling race from Digne-les-Bains to Pra Loup in the French Alps mountains, France, July 22, 2015. (Photo by Eric Gaillard/Reuters)

A cycling supporter cheers the pack of riders with Movistar rider Nairo Quintana of Colombia (L) as they climb during the 161-km (100 miles) 17th stage of the 102nd Tour de France cycling race from Digne-les-Bains to Pra Loup in the French Alps mountains, France, July 22, 2015. (Photo by Stefano Rellandini/Reuters)

Astana rider Vincenzo Nibali of Italy (R) leads the group ahead of Team Sky rider Chris Froome of Britain, the race leader's yellow jersey, during the 161-km (100 miles) 17th stage of the 102nd Tour de France cycling race from Digne-les-Bains to Pra Loup in the French Alps mountains, France, July 22, 2015. (Photo by Stefano Rellandini/Reuters)

Giant-Alpecin rider Simon Geschke of Germany climbs during the 161-km (100 miles) 17th stage of the 102nd Tour de France cycling race from Digne-les-Bains to Pra Loup in the French Alps mountains, France, July 22, 2015. (Photo by Stefano Rellandini/Reuters)

The pack of riders cycle past a train during the 161-km (100 miles) 17th stage of the 102nd Tour de France cycling race from Digne-les-Bains to Pra Loup in the French Alps mountains, France, July 22, 2015. (Photo by Eric Gaillard/Reuters)

Tinkoff-Saxo rider Peter Sagan of Slovakia rides downhill in the Allos pass during the 161-km (100 miles) 17th stage of the 102nd Tour de France cycling race from Digne-les-Bains to Pra Loup in the French Alps mountains, France, July 22, 2015. (Photo by Eric Gaillard/Reuters)

Team Sky rider Chris Froome of Britain (3rdL), the race leader's yellow jersey, climbs with a group of riders during the 161-km (100 miles) 17th stage of the 102nd Tour de France cycling race from Digne-les-Bains to Pra Loup in the French Alps mountains, France, July 22, 2015. (Photo by Stefano Rellandini/Reuters)

A girl rides a horse as the break away group of riders passes during the 161-km (100 miles) 17th stage of the 102nd Tour de France cycling race from Digne-les-Bains to Pra Loup in the French Alps mountains, France, July 22, 2015. (Photo by Stefano Rellandini/Reuters)

MTN-Qhubeka rider Daniel Teklehaimanot of Eritrea receives drink from a spectator as he climbs the Allos pass during the 161-km (100 miles) 17th stage of the 102nd Tour de France cycling race from Digne-les-Bains to Pra Loup in the French Alps mountains, France, July 22, 2015. (Photo by Eric Gaillard/Reuters)

A French gendarme uses a yellow flag to advise a danger as riders cycle during the 161-km (100 miles) 17th stage of the 102nd Tour de France cycling race from Digne-les-Bains to Pra Loup in the French Alps mountains, France, July 22, 2015. (Photo by Eric Gaillard/Reuters)

Team Sky rider Chris Froome of Britain (R), race leader's yellow jersey, cycles followed by Astana rider Vincenzo Nibali of Italy during the 161-km (100 miles) 17th stage of the 102nd Tour de France cycling race from Digne-les-Bains to Pra Loup in the French Alps mountains, France, July 22, 2015. (Photo by Eric Gaillard/Reuters)

Team Sky rider Chris Froome of Britain (C), the race leader's yellow jersey, cycles with the pack of riders during the 161-km (100 miles) 17th stage of the 102nd Tour de France cycling race from Digne-les-Bains to Pra Loup in the French Alps mountains, France, July 22, 2015. (Photo by Stefano Rellandini/Reuters)

A cycling supporter shouts behind the break away group of riders during the 161-km (100 miles) 17th stage of the 102nd Tour de France cycling race from Digne-les-Bains to Pra Loup in the French Alps mountains, France, July 22, 2015. (Photo by Stefano Rellandini/Reuters)

A girl ride a horse painted with red polka dots, in reference to the best climber jersey, during the 161-km (100 miles) 17th stage of the 102nd Tour de France cycling race from Digne-les-Bains to Pra Loup in the French Alps mountains, France, July 22, 2015. (Photo by Stefano Rellandini/Reuters)

A fan rides a bicycle as he is suspended from a cable during the 161-km (100 miles) 17th stage of the 102nd Tour de France cycling race from Digne-les-Bains to Pra Loup in the French Alps mountains, France, July 22, 2015. (Photo by Stefano Rellandini/Reuters)

Giant-Alpecin rider Simon Geschke of Germany sticks out his tongue as he climbs the Allos pass to win the 161-km (100 miles) 17th stage of the 102nd Tour de France cycling race from Digne-les-Bains to Pra Loup in the French Alps mountains, France, July 22, 2015. (Photo by Eric Gaillard/Reuters)

Peter Sagan of Slovakia, wearing the best sprinter's green jersey, celebrates on the podium of the seventeenth stage of the Tour de France cycling race over 161 kilometers (100 miles) with start in Digne-les-Bains and finish in Pra Loup, France, Wednesday, July 22, 2015. (Photo by Christophe Ena/AP Photo)

Canada's Hugo Houle pedals during the men's individual time trial cycling competition at the Pan Am Games in Milton, Ontario, Wednesday, July 22, 2015. Houle won the gold medal in the event. (Photo by Felipe Dana/AP Photo)

Stage winner Germany's Simon Geschke celebrates on the podium of the seventeenth stage of the Tour de France cycling race over 161 kilometers (100 miles) with start in Digne-les-Bains and finish in Pra Loup, France, Wednesday, July 22, 2015. (Photo by Christophe Ena/AP Photo)

Spain's Alberto Contador's climbs alone after he crashed speeding down Allos pass during the seventeenth stage of the Tour de France cycling race over 161 kilometers (100 miles) with start in Digne-les-Bains and finish in Pra Loup, France, Wednesday, July 22, 2015. (Photo by Christophe Ena/AP Photo)

Armindo Fonseca of France gets back on the road after going straight into the grass when arriving to fast in a hairpin turn in a downhill during the seventeenth stage of the Tour de France cycling race over 161 kilometers (100 miles) with start in Digne-les-Bains and finish in Pra Loup, France, Wednesday, July 22, 2015. (Photo by Christophe Ena/AP Photo)

Spain's Alberto Contador grimaces as he climbs alone after crashing during the seventeenth stage of the Tour de France cycling race over 161 kilometers (100 miles) with start in Digne-les-Bains and finish in Pra Loup, France, Wednesday, July 22, 2015. (Photo by Christophe Ena/AP Photo)

Lieuwe Westra of the Netherlands leans on the side of the road after crashing during the seventeenth stage of the Tour de France cycling race over 161 kilometers (100 miles) with start in Digne-les-Bains and finish in Pra Loup, France, Wednesday, July 22, 2015. (Photo by Christophe Ena/AP Photo)