Originally Posted by KoolBreeze
right... so not going to try it regularly. I want to keep my hearing and quite frankly I don't believe you.
(you don't happen to work for a tobacco company by any chance?)
Noise-wise there are differences of over 20 dB between different helmet models. If you have a quiet helmet, stick +/- to the speed limits, don't ride only on the racetrack etc. I don't think you will seriously damage your hearing - for ex. during your daily commute to work.
Besides, use common sense. If you have a helmet and the noise level gets overbearing at 60 mph of course use plugs or change your helmet for a quiter model.
But again, you'll get Tinnitus more likely for reasons as mentioned by inmate Motor7