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Old 06-15-12, 03:16 AM   #1
krobinson103
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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.
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Old 06-15-12, 04:02 AM   #2
KevinF
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The derailleur hanger threads? What happened? Did the derailleur just fall off the bike?
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Old 06-15-12, 04:10 AM   #3
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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.
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Old 06-15-12, 05:16 AM   #4
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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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