Gallery: Tour de France stage

The pack with Colombia's Nairo Quintana, wearing the best young rider's white jersey, Spain's Alejandro Valverde, third from left, Britain's Chris Froome, wearing the overall leader's yellow jersey, Germany's Emmanuel Buchmann, third from right, Spain's Joaquim Rodriguez, wearing the best climber's dotted jersey, and Peter Sagan of Slovakia, wearing the best sprinter's green jersey, observe a minute of silence for the victims of the Germanwings air crash prior to the start 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.

The pack with Colombia's Nairo Quintana, wearing the best young rider's white jersey, Spain's Alejandro Valverde, third from left, Britain's Chris Froome, wearing the overall leader's yellow jersey, Germany's Emmanuel Buchmann, third from right, Spain's Joaquim Rodriguez, wearing the best climber's dotted jersey, and Peter Sagan of Slovakia, wearing the best sprinter's green jersey, observe a minute of silence for the victims of the Germanwings air crash prior to the start 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.

Team Sky rider Chris Froome of Britain (C), race leader's yellow jersey, cycles with Movistar rider Alejandro Valverde of Spain (R) during the 186.5-km (115.88 miles) 18th stage of the 102nd Tour de France cycling race from Gap to Saint-Jean-de-Maurienne in the French Alps mountains, France. REUTERS/Benoit Tessier

The pack of the riders, including overall yellow jersey leader Team Sky rider Chris Froome of Britain (5thL), cycle during the 186.5-km (115.88 miles) 18th stage of the 102nd Tour de France cycling race from Gap to Saint-Jean-de-Maurienne in the French Alps mountains, France. REUTERS/Stefano Rellandini

Colombia's Nairo Quintana, wearing the best young rider's white jersey, Britain's Chris Froome, wearing the overall leader's yellow jersey, Spain's Alejandro Valverde, Italy's Vincenzo Nibali, Spain's Alberto Contador, and Robert Gesink of the Netherlands, from left to right, climb during the eighteenth stage of the Tour de France cycling race over 186.5 kilometers (115.9 miles) with start in Gap and finish in Saint-Jean-de-Maurienne, France.

Robert Gesink of the Netherlands leads the group of riders with Spain's Alberto Contador, in second position, Spain's Alejandro Valverde, in third position, Italy's Vincenzo Nibali, rear right, Colombia's Nairo Quintana, wearing the best young rider's white jersey, and Britain's Chris Froome, half hidden rear, during the eighteenth stage of the Tour de France cycling race over 186.5 kilometers (115.9 miles) with start in Gap and finish in Saint-Jean-de-Maurienne, France.

Spain's Alberto Contador looks back to check how much lead he has on the group with overall leader Britain's Chris Froome as he breaks away during the eighteenth stage of the Tour de France cycling race over 186.5 kilometers (115.9 miles) with start in Gap and finish in Saint-Jean-de-Maurienne, France. Photo by: Christophe Ena/AP

Britain's Chris Froome, wearing the overall leader's yellow jersey, Italy's Vincenzo Nibali, center in blue, and Colombia's Nairo Quintan, wearing the best young rider's white jersey, ride during the eighteenth stage of the Tour de France cycling race over 186.5 kilometers (115.9 miles) with start in Gap and finish in Saint-Jean-de-Maurienne, France. Photo by: Christophe Ena/AP

The group with Britain's Chris Froome, wearing the overall leader's yellow jersey, climbs the Montvernier hairpins during the eighteenth stage of the Tour de France cycling race over 186.5 kilometers (115.9 miles) with start in Gap and finish in Saint-Jean-de-Maurienne, France. Photo/Christophe Ena/AP

Britain's Geraint Thomas leads before Italy's Vincenzo Nibali, Britain's Chris Froome, wearing the overall leader's yellow jersey, Bauke Mollema of the Netherlands, and Australia's Richie Porte, as they speed downhill during the eighteenth stage of the Tour de France cycling race over 186.5 kilometers (115.9 miles) with start in Gap and finish in Saint-Jean-de-Maurienne, France. Photo by: Christophe Ena/AP

Team Sky rider Chris Froome of Britain (C), the race leader's yellow jersey, climbs with a group of riders during the 186.5-km (115.88 miles) 18th stage of the 102nd Tour de France cycling race from Gap to Saint-Jean-de-Maurienne in the French Alps mountains, France. REUTERS/Stefano Rellandini

Spain's Alberto Contador breaks away form the group with Britain's Chris Froome during the eighteenth stage of the Tour de France cycling race over 186.5 kilometers (115.9 miles) with start in Gap and finish in Saint-Jean-de-Maurienne, France. Photo by: Christophe Ena/AP

Team Sky rider Chris Froome of Britain (C), race leader's yellow jersey, cycles during the 186.5-km (115.88 miles) 18th stage of the 102nd Tour de France cycling race from Gap to Saint-Jean-de-Maurienne in the French Alps mountains, France. REUTERS/Benoit Tessier

The pack with Britain's Chris Froome, wearing the overall leader's yellow jersey, rides during the eighteenth stage of the Tour de France cycling race over 186.5 kilometers (115.9 miles) with start in Gap and finish in Saint-Jean-de-Maurienne, France. Photo by: Laurent Cipriani/AP

Team Sky rider Chris Froome of Britain (C), race leader's yellow jersey, cycles during the 186.5-km (115.88 miles) 18th stage of the 102nd Tour de France cycling race from Gap to Saint-Jean-de-Maurienne in the French Alps mountains, France. REUTERS/Benoit Tessier

The group with Britain's Chris Froome, wearing the overall leader's yellow jersey, rides during the eighteenth stage of the Tour de France cycling race over 186.5 kilometers (115.9 miles) with start in Gap and finish in Saint-Jean-de-Maurienne, France. Photo by: Christophe Ena/AP

Tinkoff-Saxo rider Alberto Contador of Spain (R) cycles with Movistar rider Alejandro Valverde of Spain (C) and Movistar rider Nairo Quintana of Colombia during the 186.5-km (115.88 miles) 18th stage of the 102nd Tour de France cycling race from Gap to Saint-Jean-de-Maurienne in the French Alps mountains, France. REUTERS/Bernard Papon/Pool

Team Sky rider Chris Froome of Britain (R), the race leader's yellow jersey, speeds down followed by Movistar rider Nairo Quintana of Colombia during the 186.5-km (115.88 miles) 18th stage of the 102nd Tour de France cycling race from Gap to Saint-Jean-de-Maurienne in the French Alps mountains, France. REUTERS/Stefano Rellandini

Movistar rider Nairo Quintana of Colombia cycles during the 186.5-km (115.88 miles) 18th stage of the 102nd Tour de France cycling race from Gap to Saint-Jean-de-Maurienne in the French Alps mountains, France. REUTERS/Benoit Tessier

Denmark's Jakob Fuglsang leads the chase of the group after stage winner Romain Bardet of France during the eighteenth stage of the Tour de France cycling race over 186.5 kilometers (115.9 miles) with start in Gap and finish in Saint-Jean-de-Maurienne, France. Photo by: Laurent Cipriani/AP

AG2R La Mondiale rider Romain Bardet of France speeds down during the break away in the 186.5-km (115.88 miles) 18th stage of the 102nd Tour de France cycling race from Gap to Saint-Jean-de-Maurienne in the French Alps mountains. REUTERS/Stefano Rellandini

AG2R La Mondiale rider Romain Bardet of France celebrates as he wins the 186.5-km (115.88 miles) 18th stage of the 102nd Tour de France cycling race from Gap to Saint-Jean-de-Maurienne in the French Alps mountains, France. REUTERS/Eric Gaillard