There's plenty of inspection in motorsport to make sure the cars are conforming to regulation too. Boxers gets checked by the referee before the fight, runner's

There's plenty of inspection in motorsport to make sure the cars are conforming to regulation too. Boxers gets checked by the referee before the fight, runner's aren't allowed shoes with a stack height above a certain threshold, etc. Cycling has had high profile doping scandals, but plenty of other sports have more doping but without the scandals. There's not a single bodybuilder or strongman that aren't doping for instance, and it's not even a secret. Plenty of athletes talk about how they make it through the season or individual games by injecting painkillers, cycling has a total ban on all injections. Motor doping is not a realistic issue, there has been one cyclist getting caught in 2016, and that was in cyclo cross, not road racing. It's just not happening on the higher levels. For instance, this years olympic road race course is 273 km long with 2800 meters of climbing. Even if you could hide a motor and battery from the inspection and other riders, even if a team would be willing to risk their entire future if they got caught, even if nobody in the entire team would say anything, you're only going to fit a very small battery inside a road bike. For most of the 273 km it's unnecessary weight, so even if it was possible to get away with, which I don't think it is, would it even be a net benefit? I doubt it.