Another case of motor doping? Watch the video

The mechanical doping scandals continue, this time at the Tour de Bretagne where speculation about motors in bicycles has flared up again.

Adrien Costa, USA national team, took a solo win into Lannion on stage four. Upon finishing, the rider laid his bike down and was congratulated by spectators.

Some Twitter users were quick to point out that Costa’s rear wheel appears to start turning again without propulsion from the pedals. What is your opinion?