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it stings on gravel

Parking is difficult in the area after 10:00. The area is beautiful and has great views. You can take a practically flat route (Collformic to the ruins of El Café, but it's not circular), a more challenging one like Matagalls. And many more!

You'll have good luck if you see the Magical mountain, and the descent after is fantastic :-)

Beautiful, even, climb. Definitely a great option from Montseny back towards Viladrau

The uphill stretch from Roca del Valles isn't difficult and is a lovely greenery. The descent to the Orrius junction is similar.

lonely road with lots of vegetation, very pretty

Coll de Orrius is also known as Coll de Sant Bertomeu.

It is one of the many climbs that cross the coastal mountain range of the province of Barcelona, connecting in this case the towns of Argentona with Roca del Vallés. It is a port parallel to Coll de Papers, although this is much harder. The Argentona side is longer and with less slope than the Roca del Vallés. The Argentona side is 6.5 km with an average gradient of 4.5%. There is a rest with a descent in the middle area of the port, the second section being harder than the first. The Roca del Vallés side is barely 4 km with a very constant average gradient of 7%. The views of the valleys, the coast and Montseny from the top of the port are very cool and well worth it.