I think none of that here, none of the biker culture you had as I think being a biker simply wasn't a thing. In the 60s and up to 1974 Portugal was a very conservative dictatorship, "God, Country and Family" was the motto and taken seriously. Political and vice police and censorship meant acting tough on motorcycles would see you ending up worse than being banned from a pub. Mostly I think bikes were a working man's mode of transport to go to work and back, surely there must have been tough guys, and guys enjoying motorcycles even if only 50cc, but I don't think motorcycles were a symbol of anything except not having money for a car.
Having said that, I was born in 1981 so what do I know