Armstrong says he is ``100 percent committed'' to his decision to retire and that he will not be participating in any other races after July 24 -- the scheduled end of the Tour de France.
The announcement came on the eve of Armstrong's defense of his Tour de Georgia championship. The six-day, 648-mile event he uses as a training tool for the Tour de France begins Tuesday.
His new two-year contract to race for the Discovery Channel team requires he compete in just one more Tour de France.
``I hope to win one more Tour de France,'' he said.
He has said previously if he retires he would amplify his high-profile role as a cancer survivor.
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