|Femke Van den Driessche prior to being busted for mechanical doping|
In this short (under a minute) video, three time Tour de France winner Greg LeMond shows a bicycle with a hidden motor. I had always wondered if these motors were powerful enough to actually make much difference. As you will see, the motor makes the rear wheel spin at a pretty good clip. LeMond says it can deliver 250 watts for a half hour. That's pretty significant. While Mark Cavendish might generate over 1500 watts in a sprint, a typical pro cyclist will max out around 400 watts over a one hour time period.