Old 03-14-14, 02:19 PM
  #3  
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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Honestly, I doubt it's the derailleur.

Since you have a 15 year old mountain bike that has seen some rough usage the first thing that I would do would be to check the alignment of the derailleur hanger. Then, while I had the derailleur off I'd try to cycle it with just my fingers to see if it is moving over it's whole range. Check the shifter to be sure you are actually getting 7 shift positions. Finally I'd reconnect the shift cable and see if you can get all of the parts to work together.
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