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The pack with Christopher Froome of Britain, wearing the overall leader's yellow jersey, climbs Alpe-d'Huez pass during the eighteenth stage of the Tour de France cycling race over 172.5 kilometers (107.8 miles) with start in Gap and finish in Alpe-d'Huez, France, Thursday July 18, 2013. (AP Photo/Christophe Ena) ( Cycling Tour de France )

ALPE D'HUEZ, FRANCE - JULY 18: Christophe Riblon of France and Team AG2R La Mondiale reacts as he crosses the finish line to win stage eighteen of the 2013 Tour de France, a 172.5KM road stage from Gap to l'Alpe d'Huez, on July 18, 2013 in Alpe d'Huez, France. (Photo by Bryn Lennon/Getty Images) ( 173891793 )

Christopher Froome of Britain, wearing the overall leader's yellow jersey, and Nairo Alexander Quintana of Colombia, wearing the best young rider's white jersey, climb towards Alpe-d'Huez pass during the eighteenth stage of the Tour de France cycling race over 172.5 kilometers (107.8 miles) with start in Gap and finish in Alpe-d'Huez, France, Thursday July 18, 2013. (AP Photo/Joel Saget, Pool) ( Cycling Tour de France )

ALPE D'HUEZ, FRANCE - JULY 18: Dutch fans line the road to the top of the Alpe d'Huez during stage eighteen of the 2013 Tour de France, a 172.5KM road stage from Gap to l'Alpe d'Huez, on July 18, 2013 in Alpe d'Huez, France. (Photo by Doug Pensinger/Getty Images) ( 173891699 )

The pack of riders makes his way among spectators as he climbs the Alpe d'Huez mountain during the 172.5km eighteenth stage of the centenary Tour de France cycling race from Gap to l'Alpe d'Huez, in the French Alps, July 18, 2013. REUTERS/Jean-Paul Pelissier ( CYCLING-TOUR/ )

Stage winner France's Christophe Riblon (front) celebrates with his teammate France's Sebastien Minard after winning the 172.5 km eighteenth stage of the 100th edition of the Tour de France cycling race on July 18, 2013 between Gap and Alpe-d'Huez, French Alps. PASCAL GUYOT/AFP/Getty Images ( 521444263 )

Cycling fans pose while waiting for the riders climbing the Alpe d'Huez mountain during the 172.5km eighteenth stage of the centenary Tour de France cycling race from Gap to l'Alpe d'Huez, in the French Alps, July 18, 2013. REUTERS/Jean-Paul Pelissier ( CYCLING-TOUR/ )

Dutch supporters wait for riders during the 172.5 km eighteenth stage of the 100th edition of the Tour de France cycling race on July 18, 2013 between Gap and Alpe-d'Huez, French Alps. JEFF PACHOUD/AFP/Getty Images ( 521437905 )

GAP, FRANCE - JULY 18: The peloton waits behind a large picture commemorating the birthday of former South African President Nelson Mandela before stage eighteen of the 2013 Tour de France, a 172.5KM road stage from Gap to l'Alpe d'Huez, on July 18, 2013 in Gap, France. (Photo by Doug Pensinger/Getty Images) ( 173806267 )

The pack of riders cycles during the 172.5km eighteenth stage of the centenary Tour de France cycling race from Gap to l'Alpe d'Huez, in the French Alps, July 18, 2013. REUTERS/Eric Gaillard ( CYCLING-TOUR/ )

Cycling fans from Norway pose while waiting for the riders climbing the Alpe d'Huez mountain during the 172.5km eighteenth stage of the centenary Tour de France cycling race from Gap to l'Alpe d'Huez, in the French Alps, July 18, 2013. REUTERS/Jacky Naegelen ( CYCLING-TOUR/ )

France's Christophe Riblon (R) rides ahead of USA's Tejay Van Garderen as they lead the breakaway during the 172.5 km eighteenth stage of the 100th edition of the Tour de France cycling race on July 18, 2013 between Gap and Alpe-d'Huez, French Alps. PASCAL GUYOT/AFP/Getty Images ( 521441654 )

Overall leader's yellow jersey Britain's Christopher Froome rides in the pack in the Col de Sarenne during the 172.5 km eighteenth stage of the 100th edition of the Tour de France cycling race on July 18, 2013 between Gap and Alpe-d'Huez, French Alps. JOEL SAGET/AFP/Getty Images ( 521440181 )

Christopher Froome of Britain, wearing the overall leader's yellow jersey, Spain's Alberto Contador, Spain's Alejandro Valverde and Nairo Alexander Quintana of Colombia, wearing the best young rider's white jersey, from left to right, speed down Sarenne pass during the eighteenth stage of the Tour de France cycling race over 172.5 kilometers (107.8 miles) with start in Gap and finish in Alpe-d'Huez, France, Thursday July 18, 2013. (AP Photo/Christophe Ena) ( APTOPIX Cycling Tour de France )

In this image taken Wednesday July 17, 2013, Dutch cycling fans, one holding the signpost of the Dutch city of Veldhoven, dance in curve number 7, also known as the Dutch curve, in the climb towards Alpe-d'Huez pass, France. Dutch fans gathered days ahead of the eighteenth stage of the Tour de France cycling race over 172.5 kilometers (107.8 miles) with start in Gap and finish in Alpe-d'Huez, France, Thursday July 18, 2013. (AP Photo/Thibault Camus) ( Cycling Tour de France 5 Things To Know Mountain Mayhem )

The pack of riders cycles during the 172.5km eighteenth stage of the centenary Tour de France cycling race from Gap to l'Alpe d'Huez, in the French Alps, July 18, 2013. REUTERS/Eric Gaillard ( CYCLING-TOUR/ )

ALPE D'HUEZ, FRANCE - JULY 18: Riders make their way up the final climb during stage eighteen of the 2013 Tour de France, a 172.5KM road stage from Gap to l'Alpe d'Huez, on July 18, 2013 in Alpe d'Huez, France. (Photo by Doug Pensinger/Getty Images) ( 173891207 )

Spectators watch the pack pass from the summit of Sarenne pass during the eighteenth stage of the Tour de France cycling race over 172.5 kilometers (107.8 miles) with start in Gap and finish in Alpe-d'Huez, France, Thursday July 18, 2013. (AP Photo/Christophe Ena) ( Cycling Tour de France )

The pack of riders cycles during the 172.5km eighteenth stage of the centenary Tour de France cycling race from Gap to l'Alpe d'Huez, in the French Alps, July 18, 2013. REUTERS/Eric Gaillard ( CYCLING-TOUR/ )

Disguised supporters sit on the roof of a camper van cheer riders during the 172.5 km eighteenth stage of the 100th edition of the Tour de France cycling race on July 18, 2013 between Gap and Alpe-d'Huez, French Alps. JOEL SAGET/AFP/Getty Images ( 521443701 )

Cycling fans from Norway pose while waiting for the riders climbing the Alpe d'Huez mountain during the 172.5km eighteenth stage of the centenary Tour de France cycling race from Gap to l'Alpe d'Huez, in the French Alps, July 18, 2013. REUTERS/Eric Gaillard ( CYCLING-TOUR/ )

Race leader Yellow jersey holder Team Sky rider Christopher Froome of Britain climbs the Alpe d'Huez mountain behind team mate Richie Porte of Australia during the 172.5km eighteenth stage of the centenary Tour de France cycling race from Gap to l'Alpe d'Huez, in the French Alps, July 18, 2013. REUTERS/Pool ( CYCLING-TOUR/ )

ALPE D'HUEZ, FRANCE - JULY 18: Alberto Contador of Spain and Team Saxo-Tinkoff reacts as he crosses the finish line at the end of stage eighteen of the 2013 Tour de France, a 172.5KM road stage from Gap to l'Alpe d'Huez, on July 18, 2013 in Alpe d'Huez, France. (Photo by Bryn Lennon/Getty Images) ( 173951341 )

CHAUFFAYER, FRANCE - JULY 18: Sky Procycling drive the peloton as they defend the overall race leader's jersey for Chris Froome of Great Britain riding for Sky Procycling during stage eighteen of the 2013 Tour de France, a 172.5KM road stage from Gap to l'Alpe d'Huez, on July 18, 2013 in Chauffayer, France. (Photo by Doug Pensinger/Getty Images) ( 173951734 )

ALPE D'HUEZ, FRANCE - JULY 18: Chris Froome of Great Britain and Team Sky Procycling rides during stage eighteen of the 2013 Tour de France, a 172.5KM road stage from Gap to l'Alpe d'Huez, on July 18, 2013 in Alpe d'Huez, France. (Photo by Doug Pensinger/Getty Images) ( 173811072 )

Race leader yellow jersey holder Team Sky rider Christopher Froome of Britain climbs the Alpe d'Huez mountain during the 172.5km eighteenth stage of the centenary Tour de France cycling race from Gap to l'Alpe d'Huez, in the French Alps, July 18, 2013. REUTERS/Eric Gaillard ( CYCLING-TOUR/ )

The pack rides during the eighteenth stage of the Tour de France cycling race over 172.5 kilometers (107.8 miles) with start in Gap and finish in Alpe-d'Huez, France, Thursday July 18, 2013. (AP Photo/Laurent Cipriani) ( Cycling Tour de France )

The pack rides in the Col de Sarenne during the 172.5 km eighteenth stage of the 100th edition of the Tour de France cycling race on July 18, 2013 between Gap and Alpe-d'Huez, French Alps. JOEL SAGET/AFP/Getty Images ( 521443621 )

In this image taken Wednesday July 17, 2013, Dutch cycling fans dance in curve number 7, also known as the Dutch curve, in the climb towards Alpe-d'Huez pass, France. Dutch fans gathered days ahead of the eighteenth stage of the Tour de France cycling race over 172.5 kilometers (107.8 miles) with start in Gap and finish in Alpe-d'Huez, France, Thursday July 18, 2013. (AP Photo/Thibault Camus) ( Cycling Tour de France 5 Things To Know Mountain Mayhem )

Richie Porte of Australia, bottom left, and Christopher Froome of Britain, wearing the overall leader's yellow jersey, climb towards Alpe-d'Huez pass during the eighteenth stage of the Tour de France cycling race over 172.5 kilometers (107.8 miles) with start in Gap and finish in Alpe-d'Huez, France, Thursday July 18, 2013. (AP Photo/Laurent Rebours) ( Cycling Tour de France )

AG2r La Mondiale team rider Christophe Riblon of France cycles to win the 172.5km eighteenth stage of the centenary Tour de France cycling race from Gap to l'Alpe d'Huez, in the French Alps, July 18, 2013. REUTERS/Jean-Paul Pelissier ( CYCLING-TOUR/ )

France's Christophe Riblon celebrates as he crosses the finish line at the end of the 172.5 km eighteenth stage of the 100th edition of the Tour de France cycling race on July 18, 2013 between Gap and Alpe-d'Huez, French Alps. JEFF PACHOUD/AFP/Getty Images ( 521440034 )

ALPE D'HUEZ, FRANCE - JULY 18: (L-R) Chris Froome of Great Britain and Team Sky Procycling and team mate Richie Porte of Australia cross the finish line together at the end of stage eighteen of the 2013 Tour de France, a 172.5KM road stage from Gap to l'Alpe d'Huez, on July 18, 2013 in Alpe d'Huez, France. (Photo by Bryn Lennon/Getty Images) ( 173891146 )

Nairo Alexander Quintana of Colombia, wearing the best young rider's white jersey, and Christopher Froome of Britain, wearing the overall leader's yellow jersey, climb towards Alpe-d'Huez pass during the eighteenth stage of the Tour de France cycling race over 172.5 kilometers (107.8 miles) with start in Gap and finish in Alpe-d'Huez, France, Thursday July 18, 2013. (AP Photo/Christophe Ena) ( Cycling Tour de France )

Luis Quintana, second from right, and his wife Eloisa Rojas, third from right, parents of Movistar cyclist Nairo Quintana, watch their son compete in the 18th stage of the Tour de France cycling race at the main square of their hometown in Combita, central Colombia, Thursday, July 18, 2013. Relatives, resident and schoolchildren gathered at the main square of Quintana¥s hometown to follow his performance on a giant TV screen. (AP Photo/ Carlos Julio Martinez) ( Colombia Cycling Tour de France )

The pack of riders makes his way among spectators as he climbs the Alpe d'Huez mountain during the 172.5km eighteenth stage of the centenary Tour de France cycling race from Gap to l'Alpe d'Huez, in the French Alps, July 18, 2013. REUTERS/Jean-Paul Pelissier ( CYCLING-TOUR/ )

USA's Tejay Van Garderen leads the breakaway during the 172.5 km eighteenth stage of the 100th edition of the Tour de France cycling race on July 18, 2013 between Gap and Alpe-d'Huez, French Alps. PASCAL GUYOT/AFP/Getty Images ( 521442508 )

Dutch cycling fans cheers as Sep Vanmarcke of Belgium passes curve number 7, also known as the Dutch curve during the eighteenth stage of the Tour de France cycling race over 172.5 kilometers (107.8 miles) with start in Gap and finish in Alpe-d'Huez, France, Thursday July 18, 2013. (AP Photo/Thibault Camus) ( Cycling Tour de France 5 Things To Know Mountain Mayhem )

Christophe Riblon of France crosses the finish line to win the eighteenth stage of the Tour de France cycling race over 172.5 kilometers (107.8 miles) with start in Gap and finish in Alpe-d'Huez, France, Thursday July 18, 2013. (AP Photo/Peter Dejong) ( Cycling Tour de France )

ALPE D'HUEZ, FRANCE - JULY 18: Chris Froome of Great Britain and Team Sky Procycling reacts on the podium as he retains the King of the Mountains climbers polka dot jersey following stage eighteen of the 2013 Tour de France, a 172.5KM road stage from Gap to l'Alpe d'Huez, on July 18, 2013 in Alpe d'Huez, France. (Photo by Bryn Lennon/Getty Images) ( 173951053 )

ALPE D'HUEZ, FRANCE - JULY 18: Nairo Quintana of Colombia and Movistar Team reacts as he keeps the best young rider's jersey following stage eighteen of the 2013 Tour de France, a 172.5KM road stage from Gap to l'Alpe d'Huez, on July 18, 2013 in Alpe d'Huez, France. (Photo by Bryn Lennon/Getty Images) ( 173951184 )

Stage winner France's Christophe Riblon celebrates on the podium after winning the 172.5 km eighteenth stage of the 100th edition of the Tour de France cycling race on July 18, 2013 between Gap and Alpe-d'Huez, French Alps. JEFF PACHOUD/AFP/Getty Images ( 521442901 )