Fabian Cancellara ( Switzerland ) , road race silver medalist in Beijing 2008 , led the peloton .
The breakaway had 50 - seconds on the bunch at the start of the last ascent .
Fabian Cancellara ( Switzerland ) , road race silver medalist in Beijing 2008 , led the peloton , but the breakaway had 50 - seconds on the bunch at the start of the last ascent .