One of the truest things to have come out of Armstrong's mouth in recent weeks is the accepted fact that generations of riders have doped while riding the TdF.
He also said on Oprah that as far as he was concerned he couldn't win the TdF without doping.
Now, we all know that in the early days of the Tour the riders took anything they could get their hands on just to get through the bloody thing. But as the sport progressed, doping became an accepted, albeit unspoken, aspect of bike racing, particularly for riders who were competing for 300 days of the year.
So the question is: with all the (legal) advancements in training, preparation, nutrition, recovery, technology and strategy we have today is it really possible for a rider to not only race the Tour competitively, but actually win it?
And if it is, when did that happen? At which point in history can we draw the line and say this is when it became possible to compete clean?
I'm not attacking Sky or Wiggo here. I'm just curious