It was only when several teams began their chase that the gap began to dwindle .
The leader 's gap had more than halved when the pace lifted 50km from the finish ( see video of final 50km here ) .
It was only when several teams began their chase that the gap began to dwindle , and the leader 's gap had more than halved when the pace lifted 50km from the finish ( see video of final 50km here ) .