Really interesting post over at TrainingPeaks
Power Analysis: Mathew Hayman's Victory at Paris-Roubaix
Over nearly 6 hours, Hayman averaged 313W, or 3.82W/kg. His Normalized Power® (NP®) was 351W, giving him a relatively low Variabiltiy Index® (VI®) of 1.12. This is a result of being in the early break and not having to fight for positioning.
With five riders in a select group, there were several attacks in the final kilometers, including two attacks within two minutes of each other. To cover the first move, Hayman had to put out 1198W, for the second he put out 1294W, or 15.5W/kg, his peak wattage for the day.
To cover the attack by Tom Boonen in the last 2k, Hayman put out a 10 second effort of 871W, or 10.6W/kg with a maximum wattage of 1227W.
Hayman then attacked over the top of Boonen, hitting a maximum wattage of 1145W and averaging 540W for 30 seconds. During this attack his average cadence was still 100rpm.
Only two minutes later, Hayman was in the velodrome sprinting for the win. Over 20 seconds, he averaged 884W, or 10.8W/kg and hit a peak of 1234W.
From his attack to the finish, Hayman averaged 430W, or 5.24W/kg. He also averaged 93rpm.