Las rutas especiales se organizan los martes por http://sat.org.es , la Salida es en Pacr del Clot 22:15. 20-60 km, 350-1000 metros de desnivel

The special routes on  Tuesdays  the routes are  very hilly and demanding and organized by SAT
The route begins on Parc del Clot at 22:15. 20-60 km, The difference in altitude can be between 350 and 1000 meters