Comment by jamesblonde

Fabian Cancellera was widely suspected of mechanical doping in Paris Roubaix in 2010 (possibly also the tour of Flanders that year).

Since then, however, they x-ray bikes for motors. More importantly, riders aren't switching bikes they way they used to.

Greg LeMond claimed Chris Froome used on in the TDF.

References:

https://www.bennionkearny.com/the-hidden-motor-mechanical-do...

https://www.youtube.com/watch?v=sgbvuJCvfxg