Road Nazi Hunter
Join Date: Jul 2007
Location: Slow! But Ahead of You.
Bikes: Kuota Kredo, Litespeed Vortex, Aegis Victory, Burley Tandem, Cannondale Rush
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Look at the rear derailleur. Get close to the jockey pulleys. Check the chainline, is the jockey pulley as well as the cassette cog exactly in the center of the chain? If they are off to one side or the other, they can be grinding on the edge of the next cog.
Also check your derailleur for straight lines. Is it aligned straight up and down?? Could be bent derailleur hanger. Also, check to make sure the derailleur is aligned straight front to back. I had one on a new bike right out of the box slightly skewed and it made all kinds of noise. On my carbon frame, it echoed terribly.