Although quite a long route, for the most part it is fairly easy with just a few low gradient climbs and pretty traffic free country roads. However, the climb of El Fito (or El Fitu as it’s spelt by many Asturians) adds a significant level of difficulty to the route. Although not an HC climb, by the time you get to the top you will feel like it was.
Starting from Pola you head over La Camps and the pleasant descent down to Villaviciosa. From there you head to Colunga and if you like you can go the long way via Lastres and the coast or take the inland route (as in the route map). From Colunga it’s not far to El Fito through very pleasant villages and country roads. The last 4km of the climb averages nearly 12% so it’s worth taking advantage of the Mirador (viewpoint) at the top to get your breath back. The viewpoint offers spectacular views of the Picos de Europa mountain range and is a great photo opportunity.
The descent is fast and scenic all the way down to Ariondas and from there you take the main road back to Pola de Siero. It’s about 50km to Pola de Siero but the road back is fairly flat for Asturian standards.
El Fito climb: http://bikeasturias.wordpress.com/climbs/el-fitu-from-colunga/
Strava Route Map: http://www.strava.com/routes/85889