At highway speed here in France, (110-130 km/hr), the wind noise is sufficient to cause tinnitus for me, if I'm not wearing ear protection under my helmet. The bike style is a factor - my touring bike has a movable windshield that can push the airflow above my head, but the wind noise from the daily bike, with a tiny windshield, is like sticking your head out the window of a moving car.

According to this article, the source is from an OSHA study. I can’t find the study at the moment.

https://www.hear-it.org/motorcycles-hazardous-to-your-hearin...