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Old 01-14-09, 08:36 PM
  #14  
JanMM
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Join Date: Jan 2006
Location: Metro Indy, IN
Posts: 15,481

Bikes: RANS V3 ti, RANS V-Rex, RANS Screamer

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Originally Posted by PlatyPius View Post
Yes, I've seen the results of a derailleur hanger that didn't break like it's supposed to. It and the rear derailleur were still peacefully attached to the rear dropout....which was hanging off of the bike by the chain with shredded bits of carbon fiber poking out everywhere.

The problem you've just described is caused by the chain falling between the cassette and spokes about 99% of the time. As mentioned, this is usually caused by the derailleur limit screw being a fraction of a millimeter off. In rare occasions, it can be caused by someone torquing on the frame so much (standing, climbing a hill, and putting out massive wattage) that the rear end distorts enough to allow the chain to be derailled into the spokes.
To avoid catastrophic failure, I'll have to remember to always keep the RD limits adjusted just right and also, especially, to not stand up on my V-Rex when hill-climbing. "massive wattage"? Not a chance.
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