Old 06-23-13, 05:46 AM
  #13  
Retro Grouch 
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Join Date: Feb 2004
Location: St Peters, Missouri
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Bikes: Catrike 559 I own some others but they don't get ridden very much.

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That looks to me like the result of a twig in the lower chain run. The dirty little truth is any mountain bike rear derailleur, even XTR, is just a twig away from such disaster. XTRs just cost a lot more to replace.
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