RD or cassette is whistling
I have a trek 470 which may have extremely few miles on it, even though rims are worn from defective brake pads. The components are all RSX.
There is a metalic whistling sound when turning the cranks even with no load (front or back). It appears to be comming from the cassette/RD area. It started today, and seemed to go away when down and upshifting. It doesn't seem to go away anymore. I've tried Heavy lubing. The RD seems lined up with the cog.
Does the RD need tension adjustment?