'It's a big problem, for sure': how in-race motorbikes are warping race dynamics

The Tour de France has seen a growing issue with motorcycles, known as "motos," recently encroaching on the race dynamics. These vehicles have become an enveloping swarm around the peloton, with up to 100 motorbikes on each stage, creating a myriad of challenges. The heightened presence of these bikes has provided them a strategic advantage, altering the course of the race and posing potential hazards.

While the issue is not new to bike racing, it has become increasingly pronounced in recent years. According to a study by engineering professor Bert Blocken of Heriot-Watt University, a motorcycle sitting just 10 meters ahead of a cyclist reduces drag by 23%, which equates to an 8.9% speed increase. This small yet significant advantage can make a huge difference in the overall race outcome.

In the 2020 Tour de France, camera bikes frequently hovered close to breakaway riders and the peloton. This proximity allowed them to exploit the slipstream effect, with a rider's speed increasing by 15 seconds per kilometre when following a motorcycle at a five-meter distance. While the UCI has issued guidelines to limit motorbikes' impact on the race, the rules are vague, leaving room for interpretation.

Riders and cycling experts agree that the issue is real and has significant consequences. Two-time champion Jonas Vingegaard expressed frustration during the recent Tour de France, highlighting the need for a solution to this ongoing problem.