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Cannondale non-replaceable Derailleur Hanger Question

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Cannondale non-replaceable Derailleur Hanger Question

Old 08-03-14, 03:05 PM
  #1  
Leinster
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Cannondale non-replaceable Derailleur Hanger Question

The derailleur hanger on my 80's Cannondale snapped a year ago, and I've since been riding it as a single speed. A friend has access to a TiG welder, and claims it wouldn't be a problem to weld the lost piece of hanger back onto the frame and re-thread, to accept a new derailleur (or at the very least, a tensioner).

Any reasons why this wouldn't work?

And if that would work, would it be a step too far to consider asking him to spread the dropouts from 126 to 130? I was running 8spd at the time the hanger snapped, and wouldn't want to risk having the same accident again.
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Old 08-03-14, 03:35 PM
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MassiveD
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It would be a bad idea to weld it. Hard not to goof such small parts, but it also needs to have the whole frame heat treated which could be awkward. You should be able to get a hanger for the deraileur.
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Old 08-03-14, 05:23 PM
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busdriver1959
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Wouldn't just the HAZ need to be treated? If it's just the rear dropout does it really need to be treated? Forgive me if the questions are stupid, I've never tig'd and don't know much about aluminum.
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Old 08-03-14, 06:06 PM
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Leinster
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Originally Posted by MassiveD View Post
It would be a bad idea to weld it. Hard not to goof such small parts, but it also needs to have the whole frame heat treated which could be awkward. You should be able to get a hanger for the deraileur.
Haven't been able to find one so far. Like I say above, it's not a removeable hanger, it's a part of the frame.

I've looked at replacement hangers, but I'm not sure there's any way to tell for sure which one might work without ordering a bunch of them and keeping going til one fits. I've been to a couple of Dale dealers who haven't known any way of sorting it out.
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Old 08-03-14, 08:18 PM
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Problem Solvers Universal Der Hanger, part #FS0920 , from Quality Bicycle Parts.

I have seen welded repairs on these old Cannondales. Sometimes with good results, some times not. Andy.
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