Old 07-01-05, 09:04 PM
  #2  
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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The situation that you describe is fairly common among mountain bikers. If you catch a twig on the bottom run of your chain when it hits your derailleur arm it'll bind up and bend the derailleur into your spokes.
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