World champion Bradley Wiggins withdraws from the 2013 Tour de France . The British cyclist has yet to recover from an ongoing back injury . Wiggins was forced to pull out of the Giro d'Italia with a viral infection . Wiggins was set to support Chris Froome 's bid for success at this year 's Giro .
Defending champion Bradley Wiggins withdraws from the 2013 Tour de France . The British cyclist has failed to recover from an ongoing knee injury . Wiggins was forced to pull out of the Giro d'Italia with a chest infection . Wiggins was set to support Chris Froome 's bid for success at this year 's race .