Old 01-21-08, 10:49 PM
  #18  
Velo Dog
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Join Date: Jun 2004
Location: Northern Nevada
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Never used one, but do you NEED one if the bike's set up properly? I've only had the chain slip off very occasionally (like maybe four to six times in 30+ years of riding), and it's always been because I'd been sloppy in the derailleur adjustment.
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