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General classification leader Chris Froome of Great Britain and Team Sky Procycling and points classification leader Peter Sagan of Slovakia and Cannondale look on ahead of stage sixteen of the 2013 Tour de France, a 168KM road stage from Vaison-la-Romaine to Gap, on July 16, 2013 in Vaison-la-Romaine, France. (Photo by Doug Pensinger/Getty Images) ( 173651456 )

A break away group of riders cycles during the 168 km sixteenth stage of the centenary Tour de France cycling race from Vaison-La-Romaine to Gap July 16, 2013. REUTERS/Jean-Paul Pelissier ( CYCLING-TOUR/ )

Race leader's yellow jersey holder Team Sky rider Christopher Froome of Britain cycles with team mates during the 168 km sixteenth stage of the centenary Tour de France cycling race from Vaison-La-Romaine to Gap July 16, 2013. REUTERS/Jean-Paul Pelissier ( CYCLING-TOUR/ )

Fans chase Rui Costa of Portugal riding for Team Movistar as he attacks the breakaway group on the Col de Manse en route to winning stage sixteen of the 2013 Tour de France, a 168KM road stage from Vaison-la-Romaine to Gap, on July 16, 2013 in Gap, France. (Photo by Doug Pensinger/Getty Images) ( 173647833 )

The breakaway passes through the Gorges de la Meouge during stage sixteen of the 2013 Tour de France, a 168KM road stage from Vaison-la-Romaine to Gap, on July 16, 2013 in Chateau Neuf de Chabre, France. (Photo by Doug Pensinger/Getty Images) ( 173647380 )

France's Sylvain Chavanel rides during the 168 km sixteenth stage of the 100th edition of the Tour de France cycling race on July 16, 2013 between Vaison-la-Romaine and Gap, southeastern France. JOEL SAGET/AFP/Getty Images ( 521382043 )

The pack rides during the 168 km sixteenth stage of the 100th edition of the Tour de France cycling race on July 16, 2013 between Vaison-la-Romaine and Gap, southeastern France. PASCAL GUYOT/AFP/Getty Images ( 521387528 )

The peloton winds through the hills with the Mount Ventoux in the background during stage sixteen of the 2013 Tour de France, a 168KM road stage from Vaison-la-Romaine to Gap, on July 16, 2013 in Vaison-la-Romaine, France. (Photo by Doug Pensinger/Getty Images) ( 173647379 )

Roman Kreuziger of the Czech Republic, right, , wearing the overall leader's yellow jersey, Nairo Alexander Quintana of Colombia, wearing the best young rider's white jersey, and Spain's Alberto Contador, second left, climb Manse pass during the sixteenth stage of the Tour de France cycling race over 168 kilometers (105 miles) with start in in Vaison-la-Romaine and finish in Gap, France, Tuesday July 16, 2013. (AP Photo/Christophe Ena) ( Cycling Tour de France )

The pack rides during the 168 km sixteenth stage of the 100th edition of the Tour de France cycling race on July 16, 2013 between Vaison-la-Romaine and Gap, southeastern France. JOEL SAGET/AFP/Getty Images ( 521381518 )

Chris Froome of Great Britain riding for Sky Procycling takes drink as he defends the overall race leader's yellow jersey during stage sixteen of the 2013 Tour de France, a 168KM road stage from Vaison-la-Romaine to Gap, on July 16, 2013 in Gap, France. (Photo by Doug Pensinger/Getty Images) ( 173642347 )

Chris Froome of Great Britain riding for Sky Procycling defends the overall race leader's yellow jersey as the peloton passes through the Gorges de la Meouge during stage sixteen of the 2013 Tour de France, a 168KM road stage from Vaison-la-Romaine to Gap, on July 16, 2013 in Chateau Neuf de Chabre, France. (Photo by Doug Pensinger/Getty Images) ( 173641910 )

The peloton is chased by a television helicopter during stage sixteen of the 2013 Tour de France, a 168KM road stage from Vaison-la-Romaine to Gap, on July 16, 2013 in Gap, France. (Photo by Doug Pensinger/Getty Images) ( 173650713 )

Spain's Alejandro Valverde, Jesus Hernandez Blazquez and teammate Alberto Contador of Spain, ride in the pack during the sixteenth stage of the Tour de France cycling race over 168 kilometers (105 miles) with start in in Vaison-la-Romaine and finish in Gap, France, Tuesday July 16, 2013. (AP Photo/Laurent Cipriani) ( Cycling Tour de France )

A break away group of riders cycles during the 168 km sixteenth stage of the centenary Tour de France cycling race from Vaison-La-Romaine to Gap July 16, 2013. REUTERS/Jean-Paul Pelissier ( CYCLING-TOUR/ )

The pack passes lavender fields during the sixteenth stage of the Tour de France cycling race over 168 kilometers (105 miles) with start in in Vaison-la-Romaine and finish in Gap, France, Tuesday July 16, 2013. (AP Photo/Christophe Ena) ( Cycling Tour de France )

Best young's white jersey Colombia's Nairo Quintana (L) rides in the pack during the 168 km sixteenth stage of the 100th edition of the Tour de France cycling race on July 16, 2013 between Vaison-la-Romaine and Gap, southeastern France. JOEL SAGET/AFP/Getty Images ( 521382577 )

Rui Costa of Portugal riding for Team Movistar attacks the breakaway group on the Col de Manse en route to winning stage sixteen of the 2013 Tour de France, a 168KM road stage from Vaison-la-Romaine to Gap, on July 16, 2013 in Gap, France. (Photo by Doug Pensinger/Getty Images) ( 173647830 )

Movistar Team rider Rui Alberto Costa of Portugal crosses the finish line to win the 168 km sixteenth stage of the centenary Tour de France cycling race from Vaison-La-Romaine to Gap July 16, 2013. REUTERS/Eric Gaillard ( CYCLING-TOUR/ )

Britain's Christopher Froome celebrates his overall leader's yellow jersey on the podium at the end of the 168 km sixteenth stage of the 100th edition of the Tour de France cycling race on July 16, 2013 between Vaison-la-Romaine and Gap, southeastern France. PASCAL GUYOT/AFP/Getty Images ( 521387554 )

Stage winner Portugal's Rui Alberto Costa celebrates on the podium after winning the 168 km sixteenth stage of the 100th edition of the Tour de France cycling race on July 16, 2013 between Vaison-la-Romaine and Gap, southeastern France. PASCAL GUYOT/AFP/Getty Images ( 521386252 )

A LCL vehicle belonging to the Tour de France advertising caravan is seen during the 168 km sixteenth stage of the 100th edition of the Tour de France cycling race on July 16, 2013 between Vaison-la-Romaine and Gap, southeastern France. JOEL SAGET/AFP/Getty Images ( 521389805 )

France's Thomas Voeckler leaves the anti-doping control zone at the end of the 168 km sixteenth stage of the 100th edition of the Tour de France cycling race on July 16, 2013 between Vaison-la-Romaine and Gap, southeastern France. PASCAL GUYOT/AFP/Getty Images ( 521388751 )

Alberto Contador of Spain riding for Team Saxo-Tinkoff signs autographs for fans ahead of stage sixteen of the 2013 Tour de France, a 168KM road stage from Vaison-la-Romaine to Gap, on July 16, 2013 in Vaison-la-Romaine, France. (Photo by Doug Pensinger/Getty Images) ( 173651511 )