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Old Frame, no Derailleur Hanger

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Old Frame, no Derailleur Hanger

Old 08-04-22, 07:14 PM
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etherhuffer 
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Old Frame, no Derailleur Hanger

I have an old frame that used a claw type derailleur. Unfortunately no hole to mount a derailleur hanger on the dropout. I can easily drill and tap a hole. Would having someone braze the hanger in place be overkill? Its getting new paint so no worries about torching the paint
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Old 08-04-22, 08:03 PM
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Why not just get a claw to mount the derailleur? Is there something unusual about either the dropout or the derailleur that precludes this?
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Old 08-04-22, 08:45 PM
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Originally Posted by JohnDThompson
Why not just get a claw to mount the derailleur? Is there something unusual about either the dropout or the derailleur that precludes this?
claw and derailleur hanger same thing? Terminology?
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Old 08-04-22, 08:47 PM
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Should be fine.
The plus side is no retaining nut means that modern high number cassettes won't have interference issues between the small cog, chain, & the frame/hanger nut.
You might braze on a hanger to both sides & remove the unneeded bit on the NDS so that both dropouts are the same thickness (8-9mm-ish) so that long axle nubs & QR's play nicely.

IMG_0554 by Richard Mozzarella, on Flickr


IMG_0553 by Richard Mozzarella, on Flickr

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Old 08-04-22, 08:57 PM
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Originally Posted by etherhuffer
claw and derailleur hanger same thing? Terminology?
"Claw" generally refers to a bolt-on piece onto which the derailleur mounts, "hanger" generally refers to an integral part of the dropout onto which the derailleur mounts.
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Old 08-04-22, 08:59 PM
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Originally Posted by JohnDThompson
"Claw" generally refers to a bolt-on piece onto which the derailleur mounts, "hanger" generally refers to an integral part of the dropout onto which the derailleur mounts.
Aha! Got it. Yes, I was going to get a claw, need to drill a hole in the dropout to secure it. I was thinking braze a claw onto the existing dropout, but that makes no sense, you would just braze in a new dropout.
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Old 08-04-22, 09:07 PM
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Originally Posted by etherhuffer
Aha! Got it. Yes, I was going to get a claw, need to drill a hole in the dropout to secure it. I was thinking braze a claw onto the existing dropout, but that makes no sense, you would just braze in a new dropout.
You shouldn't need to drill any hole. Claws mount into the dropout slot:
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Old 08-05-22, 10:17 AM
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Originally Posted by base2
Should be fine.
The plus side is no retaining nut means that modern high number cassettes won't have interference issues between the small cog, chain, & the frame/hanger nut.
You might braze on a hanger to both sides & remove the unneeded bit on the NDS so that both dropouts are the same thickness (8-9mm-ish) so that long axle nubs & QR's play nicely.

IMG_0554 by Richard Mozzarella, on Flickr


IMG_0553 by Richard Mozzarella, on Flickr
Interesting. The more I look at this, the more I like the idea of replacing the dropout with a new one.. All the choices mentioned would work well though. Plus, I would get to play with a torch! Thanks all for the input.
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Old 08-05-22, 11:02 AM
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Posted this fix over 12 years ago. I have done this on three bicycles and they are all working fine. I run 34T Cogs on my freewheels so I needed a longer hanger.

https://www.bikeforums.net/classic-v...lded-puch.html
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Old 08-05-22, 11:03 AM
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I also recently "discovered" that even among these two types, not all claws are the same length, and I was able to get a RD to work with a larger freewheel by going through the bin at my local bike co-op to find a 6mm longer claw to get the RD to sit further from the sprockets.

-Will
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Old 08-05-22, 11:20 AM
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I face the same issue with my most recent acquisition, the 1962 Carlton Franco-Suisse, which surprised me by never having had a derailleur hanger. For starters I plan to use the SunTour VGT and claw that were on it when I got it.
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Old 08-05-22, 08:37 PM
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Originally Posted by zandoval
Posted this fix over 12 years ago. I have done this on three bicycles and they are all working fine. I run 34T Cogs on my freewheels so I needed a longer hanger.

https://www.bikeforums.net/classic-v...lded-puch.html
Nice! Worth consideration
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