That is the sound of our quality 660 freehub mechanism. Six degrees / 60 points of engagement. It also serves to scare off prowling cougars. This is useful in town and in the hills.
Alternatively, re-lubricating your freehub with one of our recommended greases will knock a few dB off the noise level, and also ensure your hub lives a long happy life.
Greases we recommend:
- Mobil HP 222
- Dumonde Tech Freehub Grease
Generally speaking any freehub grease from a reputable bike brand should work!