Thread: Chain Keeps coming OFF! on HARD Initial Pedaling.........need a fix
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Old 07-02-20, 01:46 PM
  #9  
steve sumner
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Bikes: '68 Masi Special road, Grail bike

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as others have stated a scrape to the derailleur is a good sign that the dropout needs realigning
there should be side to side play in the derailleur's upper pulley, it's a key part of indexed shifting
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