"Lance Armstrong is not famous because of cycling." - Mike Greenberg
Greenberg then proceeded to back this point up with the fact that he was an SI Sportsman of the Year and a folk hero because he had beaten a death sentence and gone on to compete in one of the most grueling sports in the world.
Or, as we humans put it: He was not famous because of cycling. He was famous because he was a famous athlete (whose sport was cycling) and who had beaten cancer (like many other people who were not famous cyclists and thus did not have their cancer battles publicized) in a public way (because he was famous for being a cyclist) and gone back to compete at the highest level of his sport (which happened to be cycling).
Just so that's clear.