The Hitch said:
The site
Almetriaswhile not the be all end all, gives Zoncolan an untouchable 586 rating for difficulty. Finestre with 471 is beaten only by a 515 Angliru and a 474 Mortirolo.
Not knowing spanish, I can not offer a knowledgable opinion of your site. If you could translate and post (or send to me) the equation they use, I'd be happy to evaluate it. As I posted a while ago, I would really like to put together a clearly defined database that ranks climbs.
On to the specifics: The equation I use ranks Crostis at 208, Zoncolon at 207 and Finestre at 224. Yes, Zoncolon is steeper than Crostis (11. 9% to 10.1%) but Crostis is longer (14.0km to 10.1km). Finistre shames both at 18.5km, but an average gradient of
only 9.2%. Of course, the top 8km is unpaved. On that steep of a climb, the slipstream effect is nearly negligible due primarily to the constant change of direction (I would exclude climbs such as Ventoux where the general direction does not change and prevailing winds howl), but also to the slow speeds. Grinding a 39x24 on a 9.8% is not much different than grinding a 39x28 on a 12%; in neither situation are you creating an upslope draft of significant force to aid a rider behind.
That said, I certainly may be wrong. Ive only riden a handful of the nasty Giro climbs, none of the Pyrnean climbs and dozens of the Alps. The equation I use matches nicely with my impressions of the climbs that I have riden. In other words, I have only mathematical formulas with which I can compare these three beasts - climbing any one of them using the gearing that the pros will use is beyond me.
And as to the suffering each might dole out, it reminds me of the parlor game,
which way would you rather die?