** FILE ** Overall leader Lance Armstrong, of Austin, Texas, foreground, gestures as he rides, closely followed by Jan Ullrich of Germany, during the 18th stage of the Tour de France cycling race between Bordeaux, southwestern France, and Saint-Maixent-l'Ecole, western France, in this July, 25, 2003 file photo. Former Tour de France champion Jan Ullrich, who has been dogged by doping allegations, during a news conference in Hamburg on Monday, Feb. 26, 2007 announced his retirement from cycling. (AP Photo/Laurent Rebours)