Horner will not start Tour de France stage on Saturday

Chris Horner (RadioShack) lost over twelve minutes in a crash.

Chris Horner (RadioShack) lost over twelve minutes in a crash. (Image credit: Sirotti)

Christopher Horner will not be at the start of the Tour de France's eighth stage Saturday, after suffering a concussion the previous day.  RadioShack team manager Johan Bruyneel announced the abandon Saturday morning.