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Italy's Vincenzo Nibali wearing the overall leader's yellow jersey rides during the twentieth stage, a 54 km individual time trial, as part of the 101st edition of the Tour de France cycling race on July 26, 2014 between Bergerac and Perigueux, western France. AFP PHOTO / LIONEL BONAVENTURE/AFP/Getty Images ( 531955359 )

Netherlands' Tom Dumoulin reacts as he crosses the finish line at the end of the twentieth stage, a 54 km individual time trial, as part of the 101st edition of the Tour de France cycling race on July 26, 2014 between Bergerac and Perigueux, western France. AFP PHOTO / ERIC FEFERBERG/AFP/Getty Images ( 531953078 )

Geraint Thomas of Great Britain and Team SKY in action during the twentieth stage of the 2014 Tour de France, a 54km individual time trial stage between Bergerac and Perigueux, on July 26, 2014 in Perigueux, France. (Photo by Bryn Lennon/Getty Images) ( 452724150 )

Germany's Tony Martin concentrates prior to the start of the twentieth stage of the Tour de France cycling race, an individual time-trial over 54 kilometers (33.6 miles) with start in Bergerac and finish in Perigueux, France, Saturday, July 26, 2014. (AP Photo/Laurent Cipriani) ( Cycling Tour de France )

Italy's Vincenzo Nibali, wearing the overall leader's yellow jersey, rides during the twentieth stage of the Tour de France cycling race, an individual time-trial over 54 kilometers (33.6 miles) with start in Bergerac and finish in Perigueux, France, Saturday, July 26, 2014. (AP Photo/Laurent Cipriani) ( Cycling Tour de France )

Chris Horner of the United States and Lampre-Merida races in the individual time trial during the twentieth stage of the 2014 Tour de France, a 54km individual time trial stage between Bergerac and Perigueux, on July 26, 2014 in Perigueux, France. (Photo by Doug Pensinger/Getty Images) ( 452724852 )

Jens Voigt of Germany and Trek Factory Racing competes in the individual time trial during the twentieth stage of the 2014 Tour de France, a 54km individual time trial stage between Bergerac and Perigueux, on July 26, 2014 in Perigueux, France. (Photo by Doug Pensinger/Getty Images) ( 452734468 )

Netherlands' Bauke Mollema rides during the twentieth stage of the Tour de France cycling race, an individual time-trial over 54 kilometers (33.6 miles) with start in Bergerac and finish in Perigueux, France, Saturday, July 26, 2014. (AP Photo/Christophe Ena) ( Cycling Tour de France )

Spectators cheer as Italy's Vincenzo Nibali, wearing the overall leader's yellow jersey, steers into a corner the twentieth stage of the Tour de France cycling race, an individual time-trial over 54 kilometers (33.6 miles) with start in Bergerac and finish in Perigueux, France, Saturday, July 26, 2014. (AP Photo/Laurent Cipriani) ( Cycling Tour de France )

Netherlands' Tom Dumoulin crosses the finish line at the end of the twentieth stage, a 54 km individual time trial, as part of the 101st edition of the Tour de France cycling race on July 26, 2014 between Bergerac and Perigueux, western France. AFP PHOTO / ERIC FEFERBERG/AFP/Getty Images ( 531953062 )

France's Jean-Christophe Peraud concentrates before taking the start of the twentieth stage, a 54 km individual time trial, as part of the 101st edition of the Tour de France cycling race on July 26, 2014 between Bergerac and Perigueux, western France. AFP PHOTO / LIONEL BONAVENTURE/AFP/Getty Images ( 531953398 )

Italy's Vincenzo Nibali wearing the overall leader's yellow jersey rides as supporters cheer during the twentieth stage, a 54 km individual time trial, as part of the 101st edition of the Tour de France cycling race on July 26, 2014 between Bergerac and Perigueux, western France. AFP PHOTO / LIONEL BONAVENTURE/AFP/Getty Images ( 531955128 )

Italy's Vincenzo Nibali wearing the overall leader's yellow jersey rides during the twentieth stage, a 54 km individual time trial, as part of the 101st edition of the Tour de France cycling race on July 26, 2014 between Bergerac and Perigueux, western France. AFP PHOTO / LIONEL BONAVENTURE/AFP/Getty Images ( 531955426 )

Belgium's Jurgen Van Den Broeck rides during the twentieth stage, a 54 km individual time trial, as part of the 101st edition of the Tour de France cycling race on July 26, 2014 between Bergerac and Perigueux, western France. AFP PHOTO / JEFF PACHOUD/AFP/Getty Images ( 531956699 )

Peter Sagan of Slovakia and Cannondale takes the podium after defending the points leader's green jersey in the individual time trial during the twentieth stage of the 2014 Tour de France, a 54km individual time trial stage between Bergerac and Perigueux, on July 26, 2014 in Perigueux, France. (Photo by Doug Pensinger/Getty Images) ( 452725156 )

Tony Martin of Germany and the Omega Pharma - Quick-Step Cycling Team celebrates on the podium after winning the individual time trial during the twentieth stage of the 2014 Tour de France, a 54km individual time trial stage between Bergerac and Perigueux, on July 26, 2014 in Perigueux, France. (Photo by Doug Pensinger/Getty Images) ( 452735556 )

Italy's Vincenzo Nibali, wearing the overall leader's yellow jersey, celebrates on the podium of the twentieth stage of the Tour de France cycling race, an individual time-trial over 54 kilometers (33.6 miles) with start in Bergerac and finish in Perigueux, France, Saturday, July 26, 2014. (AP Photo/Christophe Ena) ( Cycling Tour de France )