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Bradley Wiggins speaks out about cycling doping crisis

24 October 2012 Last updated at 19:01 BST

Bradley Wiggins has spoken out about cycling's doping crisis, as the route of next year's Tour de France is unveiled.

It will be the 100th Tour and highlights will include a night-time finish along the famous Champs Elysees in Paris.

The glitzy ceremony comes just two days after the American, Lance Armstrong, was stripped of his seven Tour victories.

BBC sports correspondent Dan Roan reports