IOC : Hamilton admitted to using performance-enhancing drugs before the Athens Olympics . The Armstrong says riders who finished behind Hamilton in London will now be moved up . Hamilton has accused Hamilton of doping ; Armstrong strongly denied the allegations .
IOC : Tyler Hamilton admitted to using performance-enhancing drugs before the 2004 Games . The IOC says riders who finished behind Hamilton in Athens will now be moved up . Hamilton has accused Lance Armstrong of doping ; Armstrong strongly denied the allegations .