Altitude, heat, cadence, recovery (within a day and over successive days), psychology, experience.
Probably loads of other factors.
Maybe he's easily distracted by lovely views?
Underrated observation. Have they tried blinkers on him?
That is my excuse for being a poor climber. As well as being fat and having no watts to give.
That's my excuse. Literally the only reason I'm not in the World Tour right now.
@owl started
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Altitude, heat, cadence, recovery (within a day and over successive days), psychology, experience.
Probably loads of other factors.