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Riders hit back at Armstrong Tour doping claims

File picture shows seven-time Tour de France winner Lance Armstrong at a press conference in Los Angeles on February 28, 2011. Tour de France riders on Friday dismissed claims by shamed US cyclist Armstrong that it was "impossible" to win the sport's mostTour de France riders on Friday dismissed claims by shamed US cyclist Lance Armstrong that it was "impossible" to win the sport's most famous race without doping, saying his claims hit at their credibility.