The fastest massed-start stage was in 1999 from Laval to Blois (194.5 km), won by Mario Cipollini at 50.4 km / h (31.32 mph). The fastest time-trial is Rohan Dennis' stage 1 of the 2015 Tour de France in Utrecht, won at an average of 55.446 km / h (34.5 mph). The fastest stage win was by the 2013 Orica GreenEDGE team in a team time-trial. It completed the 25 km time-trial at 57.7 km / h (35.85 mph).

Answer this question: fastest tour de france time trial in history? Let's give stream of consciousness first:
To answer the above question, the relevant sentence is: The fastest time-trial is Rohan Dennis' stage 1 of the 2015 Tour de France in Utrecht, won at an average of 55.446 km / h (34.5 mph).
So, the final answer is Rohan Dennis ' stage 1 of the 2015 Tour de France in Utrecht , won at an average of 55.446 km / h ( 34.5 mph ).