Originally posted by dukestreet
On a lark, I went a did a little research on noise limits and found this little site which has some stuff worth looking at. It says the safe limit of exposure of 105 dB is 1 hour. Well, if you're out cruising with a group of Harleys thats going to be even louder. If you're riding alone, with your helmet on, it obviously won't be that loud, but have you ever come back from a long ride and your ears were ringing?
With the 3/4 helmet on, nope... with the 1/2 helmet and the windshield in place, nope. With the 1/2 helmet and no windshield, the wind gets a bit loud after about 55mph (and you realize how loud when you get off the motorcycle). Besides the fact that the wind gets under my sunglasses and starts to dry my eyes out (dangerous with contacts in). The 3/4 helmet covers my ears and has a flip-up face shield. I used the 1/2 helmet most (last year) when the temp reached over 85°. Below that, and the 3/4 is still ok, with it being nicer in the cold weather.
The engine noise is behind the person driving, so it doesn't get to me when I am not in a group of Harleys (and in tail position). Even bringing up the tail end of the group, with the 3/4 helmet on, the noise is still within the safe range. Most riders, myself included, carry ear plugs for those days where you are in a large group, and using the 1/2 helmet. That way, you are still (thermally) cool, but are not going to blast out your ear drums.