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  1. #1
    Senior Member
    Join Date
    Mar 2012
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    Incheon, South Korea
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    Nothing amazing... cheap old 21 speed mtb
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    An interesting new failure - derailer hanger failure mid ride

    I got to walk home this morning - the derailer hanger threads must have worn out. Good thing the failure was close to home or things might have been bad. I think I need to add a derailer hanger to my spare parts in the saddle bag. The bike always finds a weak point somewhere.

  2. #2
    Keep on climbing
    Join Date
    Apr 2004
    Location
    Marlborough, Massachusetts
    My Bikes
    2004 Calfee Tetra Pro
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    The derailleur hanger threads? What happened? Did the derailleur just fall off the bike?
    "There is more to life than increasing its speed" -- Mahatma Gandhi

  3. #3
    Senior Member
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    Mar 2012
    Location
    Incheon, South Korea
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    Nothing amazing... cheap old 21 speed mtb
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    Must have worked loose. Then rattled around a while. Thinking about 7 and 8 have been jumpy on gravel or really uneven surfacesfor a week or so. So the thread wore out, I compensated with the barrel adjuster and today it just decided to fall off. Wasn't moving fast or it could have be very unpleasant. Got a new one that was 99% right and dremeled it to make it fit. Only needed a few mm here and there. Put the whole system back together, tightened everything as far as is safe and it rides nicely now. Still, given its a small and light part carrying an extra can't hurt.

  4. #4
    Senior Member
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    Sep 2010
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    A little thread locker like blue Loctite might be a wise precaution since the first one worked itself loose. Proper torque is also necessary; properly-torqued fasteners typically don't come loose. A spare hanger (and bolt) is always a nice item to have around, I always carry one. A pre-ride check might have revealed the loose hanger.

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