A very tough mountain stage. There is a 2nd category and a 1st category climbs on the route, then the stage will be end with a hors catégorie climb.
Km 73.2 – Portillo de Lunada. 8.3 kilometer-long climb at 5.7% – category 2
Km 17.9 – Puerto de Alisas. 10 kilometer-long climb at 6% – category 1
Km 0.0 – Alto de los Machucos. Monumento Vaca Pasiega. 7.2 kilometer-long climb at 8.7% – category H
The last climb, Alto de los Machucos is really a monster. At 7.2 km long with an average gradient of 8.7%, it does not seem exceptionally difficult on the paper. However, it contains some brutally steep slopes that ramp up to 28 percent gradient (some sources even claims that some parts are at 31% – if it’s true, that means it is steeper than the Mirador de Ézaro, which usually dubbed as the steepest climb in the bike racing history). The uneven road surface of the monstrous climb also won’t help the riders.