Thread: Help please-Bizarre acting New rear derailer
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Old 10-21-12 | 07:49 PM
  #8  
FBinNY
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From: 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

Originally Posted by uprightbent
About every 5 or 10 pedal strokes, while in the middle or granny ring, the rear derailer extends and reaches forward, causing lots of slack and slapping the chain "under" the chainstay. Then it snaps back to normal, but only briefly.
I posted earlier that this is classic chainsuck. Since you apparently didn't look it up, Here's a link to info about it. Read some of these articles and try what I or some of the writers suggested.
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