A UCI inspector examines bikes of Team Sky to detect hidden motors ahead of stage four of the Tour de France.
A UCI inspector examines bikes of Team Sky to detect hidden motors ahead of stage four of the Tour de France. (Photo: Getty Images)

How to Motorize Your Road Bike

All those rumors about pro cyclists using hidden motors to win races? Here are their options.

A UCI inspector examines bikes of Team Sky to detect hidden motors ahead of stage four of the Tour de France.
Vernon Felton

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What a difference a year makes. In 2015, the Union Cycliste Internationale (competitive cycling’s governing body) caught flak when its officials inspected 25 bikes for hidden motors during the Tour de France.

Super-secret electric bikes? The very notion was laughable. Well, nobody is chuckling at the UCI now, not after its inspectors caught Belgian racer Femke Van den Driessche with a motor tucked inside the seat tube of her bike during the World Cyclocross Championships last January. Suddenly, several years’ worth of rumors didn’t seem quite so silly.

The UCI has stepped up its game. The organization was on track to make as many as 4,000 unannounced bike checks at this year’s edition of the Tour de France, using a combination of thermal imaging cameras, its own magnetic field scanner, and a mobile X-ray machine on loan from the French government.

So what exactly is the UCI looking for? What kind of motors are we actually talking about? Here’s the breakdown.

One Well-Known Retrofit Kit

The Vivax Assist is the best-known concealed motor and the model found in Van de Driessche’s bike during the infamous bust. While the 3.9-pound motor and battery assembly is rated at 200 watts, it actually supplies 110 watts of power to the cranks for as long as 90 minutes. If that doesn’t sound terribly impressive, rest assured it’s more than enough of a boost to drop competitors.

The tube-shaped motor features a beveled gear that meshes with another beveled gear mounted on a standard Shimano bottom-bracket spindle. A battery stowed inside a water bottle powers the motor.

The Vivax Assist has been available as an upgrade kit since 2008. In the United States, you can expect to pay about $4,000 for the kit alone. Is Vivax the only outfit supplying such motors? It’s the only company doing so openly. How many individuals are building and supplying cyclists with motors in a more discreet fashion? No one knows.

A Few Ready-to-Roll Bikes

Only a few companies sell complete bikes outfitted with concealed motors. Vivax, not surprisingly, sells its own house-brand Forza CF carbon road frame outfitted with its motor and crank assembly for 4,999 euros (about $5,540). Goat Bikes is a small operation from the United Kingdom that also sells Vivax-equipped bikes, including an aluminum road bike called the Race that retails for 4,499 euros ($4,985).

The newest entry to the market is Monaco-based Typhoon Bicycles. The budding brand recently launched carbon-fiber models containing Typhoon’s patented e-Assist battery and motor system. Typhoon claims its motor offers three distinct power modes (50 to 70 watts, 130 to 160 watts, and up to 250 watts) at the push of a button. The price for its entry-level carbon-fiber road bike? A cool 8,000 euros ($8,865).

Magnetic Wheels: The New Frontier

A few journalists contend there’s yet another variant of mechanized cheating on the rise that requires no motor at all—electromagnetic wheels. Claudio Ghisalberti, writing for the Italian newspaper Gazzetta dello Sport, claims to have met with a confidential source who creates electromagnetic rear wheels that provide an extra 60 watts of power and sell for a staggering 200,000 euros ($221,570).

Similarly, reporters Thierry Vildary and Marco Bonarrigo met with Istvan Varjas, an engineer and former racer who has been building concealed bike motors for more than a decade. Varjas claims to have also developed an electromagnetic wheel. According to the engineer, neodymium magnets concealed within the sidewall of a deep-section carbon rim generate an induction force when they rotate past battery-charged electromagnets housed within the bike’s chainstays and/or seatstays. Varjas claims the system can be activated via a Bluetooth device.  The Varjas interview aired in April on the French television program Stade 2.


Lead Photo: Getty Images