North Carolina, USA
Do your research and use earplugs.
It’s not the bike noise rather the ambient sounds that cause damage.
This is a documented widely known fact.
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I developed significant tinnitus about 3 years ago. It came on fairly quickly over the span of just a few weeks, and was almost a life altering thing for me, as far as my ability to work and enjoy life. Gradually I have become 'habituated' to it, because that is all one can do. There is no treatment or cure. I've always worn earplugs when riding (over 40 yrs), but attribute my tinnitus to activities in my youth, and the '3 M's' in my life, military, music, and motorcycles. As I type this both ears are doing their normal ringing. It feels like I'm always in a crowded noisy room. I would love to have one day of silence again.
Anyone who rides without ear protection is playing Russian roulette with their hearing.