If anyone can be credited with fighting the good fight against drug use in cycling it is David Walsh.
I have just read his article suggesting that primarily (ie rather than technical bike developments) it is better nutrition and cyclists' ability to absorb a higher carbo load through gels and bars etc (120 grams/hour or more) that explains why performances today are better than in the infamous drug years.
He writes that there is no evidence that cyclists today have just found a better way of doping.
I think he is right.
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