They call it “mechanical doping,” but the name simply doesn’t do it justice. Cycling is not a sport celebrated for honesty amongst even its top riders, but following several very high-profile doping cases in recent years, it seems as though the cheats have been trying a different route: hiding motors in their seat posts that help push them to superhuman feats of endurance.

The technique has been known since at least 2010; commercial versions of the motors can put out 200 steady watts of power, nearly doubling a typical pro-cyclist’s output. An onboard motor can help riders go faster, and can keep their pedalling cadence—the number of revolutions through the crank per minute—up while energy dips in endurance stages.