 The race began with a prologue individual time trial in the Yvelines department . The 6 @.@ 7 km ( 4 @.@ 2 mi ) prologue was flat , with three major turns . The riders included four of the top five of previous year 's world time trial championships in Bradley Wiggins ( Team Sky ) , Tony Martin ( Etixx – Quick @-@ Step ) , Tom Dumoulin ( Giant – Alpecin ) and Rohan Dennis ( BMC Racing Team ) . 
