
A couple of decades ago, when Valentino Rossi was at the height of his powers, Rossi's crew chief Jeremy Burgess was interviewed. Burgess explained that if he was shown a photo of Rossi riding, he could identify what lap Rossi was on.
Is this some kind of weird superpower? Not really. Burgess was looking at Rossi's position on the bike, and dozens of tiny telltale signs of how he was adapting his riding to the bike and tires as they changed during race, as the fuel tank emptied and the tires wore and degraded.
If you have the kind of intimate knowledge of a rider's talent and habits that a crew chief does, you can spot those subtle changes. Or if you are an ex-rider and have been watching a particular rider for a long time, you can pick up on those signs too.
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