After riding it, i'd describe it as quite loud at around town speeds. Not overly, but certainly has a decent nice bark to it. My immediate thoughts were that if it was the same at 4 - 4 1/2 k rpm, I would think it was too loud, for me anyway. However, at 100 - 115kph, the noise level evened out quite nicely. We'll see how it is after a few hours continuous riding whether it's a bit draining or not.