Gonna duplicate my post from the general Giro-thread:
"Etna - Rif. Citelli 1634m - cat.1:
The Giro counts from Linguaglossa 534m, then it's 18,0km at 6,1% (1097m altitude gain)
When I count from Fiumefreddo di Sicilia 65m to Linguaglossa 534m we can add 11,1km at 4,2%, looks like it's uphill all the way.
Then it's 29,1km (1569m altitude gain) at 5.3%, wow!
Compare it with Col d'Aubisque: 29,2 km at 4,2 % (Hors Catégorie)"
So if it this was the tour it would basically be two HC-mountains back to back with the last one being a MTF.
To sum it up: the stage is more difficult than the two climbs would led you believe! It's gonna be epic.