Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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Originally Posted by DannoXYZ
Could also be the cable-tension is too tight and the chain is rubbing the side of the next gear up. Find the cable-tension barrel-adjuster at the rear-derailleur and turn it in 1 full turns (4 quarter-clicks) to loosen cable-tension.
If you're using friction as indicated in the OP, than this doesn't apply, since you move the lever to center the RD by sound and feel anyway.
I wish I could hear it, because the clatter of poor trim is very different than the loud whirring or buzzing of a worn chain. Usually if you have the clatter of poor trim and it won't go away as you trim better, that's an indicator of a bent hanger/misaligned derailleur.
The other thing is could be, especially if it happens in all gears is a worn or damaged pulley. With wear, the pulley diameter shrinks so the chain doesn't index properly to the teeth on the pulleys, and there's a constant sliding or shifting as the chain goes by.
Before you spend even a dime on parts, try cutting a paper towel into strips 1/2" wide by 4-5" long. Carefully feed one between the chain and each pulley so it winds around the pulley 1 turn and overlaps itself so it can't unwind. Go for a short ride and see if it's quieter. If so, you need new pulleys (sorry the paper towel doesn't last forever)
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