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Motor doping accusations reignite as footage of rapidly spinning wheel at Tour of Denmark surfaces

Riderless bike brought down Martin Toft Madsen – but there is another explanation behind why it was still moving

Footage of a crash at the Tour of Denmark yesterday caused by a bike that apparently made its own way across the road without a rider has reignited suspicions on social media about the use of concealed motors in the peloton.

The Danish rider Martin Toft Madsen of the BHS-PL Beton Bornholm team had to abandon the race after he crashed into the stray bike, subsequently tweeting footage of the bizarre crash with the caption “This is why I don’t like eBikes,” followed by a winking emoji.

While that tweet might be read as being posted with tongue firmly in cheek, among those to question whether there was a hidden motor in the bike was Antoine Vayer, who tweets under the name @FestinaBoy – he was a trainer at the team from 1995 to 1998, the year the Festina scandal engulfed the Tour de France – and who regularly uses his Twitter account to call into question what he views as suspicious performances.

While some replies agreed that the movement of the bike looked suspicious and could be explained by the presence of a hidden motor, others pointed out that the kinetic energy of a bike travelling at speed could explain why the wheel continued to spin and propelled the bicycle across the road.

According to’s Liam Cahill: “It’s likely a 50-60mm deep wheel spinning at what would likely be upwards of 50kph and the bike's contact with the ground is a bit of carbon frame, a bit of bartape and the sidewall of a tyre.

“People don't seem to grasp how much energy there is in a wheel. So as per usual, everyone commenting on Twitter saying that it is a motor is wrong,” he continued.

“Anyone with a motor isn't fighting to stay with the bunch in a crosswind. They'd be causing the splits.”

Road and track rider Dan Bigham shared his thoughts on Twitter: 

The bike itself may have belonged to the Vini Zabu rider Etienne van Empel, who also crashed out of the race – his team tweeted a picture of his ripped jersey after the stage.

Of course, we’ve been here before, including when similar suspicions were raised during the 2014 Vuelta against then Garmin-Sharp pro Ryder Hesjedal, the 2012 Giro d’Italia champion, after his rear wheel continued to spin following a crash.

> Ryder Hesjedal reacts to mechanical doping claims

Responding to claims he may have benefited from mechanical assistance, the Canadian said: “The back wheel’s still spinning because I was on the ground, it caught the ground and it took off a little bit.

“I think it’s funny in itself that they would even say that because even an assisted bike, it’s the crank that’s assisted so if the crank’s not moving and the rear wheel’s spinning, that’s not possible to help it. It’s not something that can do that to a bike.”

The fact remains that despite the UCI’s investment in technology aimed at detecting concealed motors, only one has been found in top-level competition. 

That was in a bike prepared for the Belgian rider Femke Van den Driessche for the Under-23 women’s race at the Cyclo-Cross World Championships at Zolder in 2015.

The 19-year-old – who had already been the subject of suspicion among fellow riders following strong performances in the World Cup earlier in the 2014/15 season – received a six-year ban from competition and was also fined 20,000 Swiss Francs.

> Mechanical doping: Six-year ban for Femke Van den Driessche

Simon joined as news editor in 2009 and is now the site’s community editor, acting as a link between the team producing the content and our readers. A law and languages graduate, published translator and former retail analyst, he has reported on issues as diverse as cycling-related court cases, anti-doping investigations, the latest developments in the bike industry and the sport’s biggest races. Now back in London full-time after 15 years living in Oxford and Cambridge, he loves cycling along the Thames but misses having his former riding buddy, Elodie the miniature schnauzer, in the basket in front of him.

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SpeedyMark | 2 years ago

More importantly where does the rider of the spinning bike go?  Do they put on their invisibility cloak?  Should they be investigated for time travel?  Presumably the field on the left but certainly not on the road.  Probably for the best at 54kph!

reippuert | 2 years ago

??? Martin Toft Madsen, the rider who wrote the tweet and who was hit by the bike is a Master of Engineering.

(& the 3rd fastes hour record rider on planet earth and winner of multiple Corno de Nations and the main areo engeneer on the danish 4K persuit track team)

He is joking and knows that what hit him was the enertia stored in a rearweel going 54km/h and a freek of nature: that the tire managed to grip and continue sideways.

nothing to see, learn danish humor

riggbeck | 2 years ago

After serving a team doping ban earlier this year it would be a bold move if Vini Zabù tried some motor doping as well.

I also think there is a boring scientific reason for it really, wild crash and I hope he's OK.

CXR94Di2 | 2 years ago

Aren't people thick.

Its just like a spinning gyroscope, just as the outer rim touches the surface, it shoots off in an uncontrolled direction

SaintClarence27 replied to CXR94Di2 | 2 years ago

CXR94Di2 wrote:

Aren't people thick. Its just like a spinning gyroscope, just as the outer rim touches the surface, it shoots off in an uncontrolled direction

It's also a distorted view - the camera is moving.  The bike didn't just move straight to the side as it looks in the video.

SKH | 2 years ago

Please stop giving these idiots like Vayer a platform, nothing he says or claims ever materialises to reality, he clearly lives in his own fantasy land free of rotational & kinetic energy being a thing!

Sriracha | 2 years ago
1 like

Adults, what do they know?

sizbut | 2 years ago

It was a targetted hit, clear and simple. All Danish riders need to be on the lookout whilst we wait for the police to confirm Tanfield's alibi. 

brooksby | 2 years ago

Didn't something like this happen a few years back?

Nick T replied to brooksby | 2 years ago

Hesjedal had a similar thing at the Giro a few years back

brianlescargot replied to Nick T | 2 years ago

Yep, and it is called inertia!

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