Hi, newbie here,
This problem has come and gone and now it's back. It appears in the higher gears on my Giant Cypress the chain rattles a bit against the front derailleur. The bike has gripshift-type gears, and if I rotate the shifter with my left hand beyond it's final click, I can see the derailleur moves a bit away from the chain and alleviates the noise. I checked out the "Sheldon on creaks" article but it didn't seem to address this. The noise is not constant, i.e. it seems worse on the right pedal downstroke, and doesn't happen at all when the gears are not engaged (like going downhill).
Any suggestions? Thank you!