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Supremacy at altitude, but also generally lighter weight.
W/KG may be similar, but the fueling and energy demands of 6.5w/kg at a weight of 60kg (Bernal), 58/59kg of Quintana of 390w compared to the 66-67kg of some of the others, like Roglic/Pogacar at 430w.At higher altitude, if the columbians can hold a higher percentage of their FTP compared to the heavier GC contenders, say 90% compared to 85%, they can put out 351w, compared to 365w of the less aclimatised heavier riders. 5.85 w/kg compared to 5.53w/kg, which starts to become quite a big difference.
Also lighter riders have to work slightly less hard to accelerate for attacks, so if they can make 3/4 attacks, compared to Roglic's super strong finish, they may be able to generate quite a big gap over a longer/steeper climb.
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Acliff
Is it that the strength of the Colombians is gradient? I thought their supremacy came at altitude (ie >1900m), although even moreso when it's steep at altitude...