Rumors have flown for years that riders were finding ways to hide tiny electrical motors in their frames, or using magnets in their wheels, to produce a couple extra watts of power. Now, mechanical doping is every bit as controversial as biological doping. ''I think when these rumors first started to surface, most normal people that it was fantastical, and nobody would stoop so low to cheat this way,'' said Brian Cookson, president of the UCI, cycling's world governing body. More...