I guess it depends on
where you start:
We're not exactly sure where Armstrong started his watch at the bottom of the climb, but in the video above he quoted the climb length as being about 12km which is roughly the distance from the first switchback up to the summit. If we had to guess we'd say that that?s where Armstrong started his efforts too.
The climb itself is quite consistent with a couple of flat spots here and there and an average gradient of a little less than 7%.
If the climb is 840m at 7%, then Froome's power is estimated at a much more believable 6.16 watts/kg. Anyone know where he started?
It's interesting that TD is so high on that list, the same as Porte, and only a handful of seconds behind Froome. He's a known doper, like the others below him on that list, but would any of these guys actually dope for a one shot climb that isn't part of a race, for a training ride? You might a little, but you obviously wouldn't waste a blood bag on a training ride. So maybe those times are for a shorter distance. But if Froome is going to compare his time to those of others, he has to know where everyone started. So if he knows what he's talking about, there must be an established place where all the pros start.
Then again, in the same article quoted above, it says Ferrari expected LA to do the ride in 6.8 watts/kg. He surely couldn't have done that clean. And his stated time for 12 km wouldn't do it. Some things don't add up.