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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Follow the operators advice, and check his entire list. But before you do the entire drill, use the cable (trim) adjuster to get the derailleur centered on a sprocket as best you can.
Search "how to adjust a derailleur" to find some tutorials. there are video or text and pictures. Review a few until you're comfortable with the basics then give it your best shot.
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions”
- Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance