For trained cyclists who aren’t afraid of a steep slope, the region is certainly satisfying. De routes are very decent and wind in the middle of nature in Serra da Estrela and Serra do Açor. In addition, this terrain is perfect for mountain biking.

http://www.ecopista-portugal.com/en/cycling-portugal.html

For the rental of bikes, you can consult the following websites:

http://www.bicicletassilvex.com.pt/

http://www.cycling-rentals.com/