Six-time world champion Michael Schumacher has admitted that his feats do not bear comparison to legendary cyclist Lance Armstrong, who is on the verge of taking his own sixth crown, this time in the Tour de France.

Armstrong's run of success in the gruelling three-week French marathon is made all the more remarkable by the fact that he was diagnosed with cancer shortly after breaking into the top flight of his sport, but overcame the setback - and the suspicions of rivals - to make the Tour his own and etch his name into cycling history alongside greats such as Eddy Merckx.

Asked whether he ranked his own success alongside that of the American, Schumacher admitted that the two sports were very different, but that he did not see himself in the same category as the cyclist.

"I don't really see that you should compare in any way, because what he is doing is so unique and so special," the German said, "I was watching [the Tour de France on] television, [watching] them sitting on the bikes again after so many days being on it, and the many kilometres they have done. I do training myself, and I know what it means to do what I'm doing, but, to do what they do, that's massive. It is really, really massive - and impressive.

"We do something different, but obviously interesting for a lot of people, but to compare [myself and Armstrong], I don't think there's common ground except the success."