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Repair derailleur hangar

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Kelpie3

Finally riding a big boys bike
Hey All,

I have a 1972 PX10 where someone cut off the derailleur hangar and replaced it with a claw presumably because the hangar was not threaded. I am looking for someone who can low temp braze a new hangar onto the dropout. I was up in Wisconsin at Yellow Jersey bikes and he said he has been doing it for years. Anyone know of anybody that can do this in the Indianapolis area? I've had the bike since 1983 and rode it for 35 years. Decided to do more work on it and just finished putting on period campy components since all the french ones were gone (except for the headset and BB) when I bought the frame.

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Hey All,

I have a 1972 PX10 where someone cut off the derailleur hangar and replaced it with a claw presumably because the hangar was not threaded. I am looking for someone who can low temp braze a new hangar onto the dropout. I was up in Wisconsin at Yellow Jersey bikes and he said he has been doing it for years. Anyone know of anybody that can do this in the Indianapolis area? I've had the bike since 1983 and rode it for 35 years. Decided to do more work on it and just finished putting on period campy components since all the french ones were gone (except for the headset and BB) when I bought the frame.

View attachment 2055514

I agree that it was likely cut off because it was a Simplex "non threaded" drop out. Had they left the original non threaded tab on, it could have had threads installed by using a "cut down" Thread-Sert.

It would seem to me that brazing the new threaded tab onto the existing drop out would not be very strong (limited surface area). Replacing the entire drop out is a much larger job, and would not be necessary, IMO. I would TIG weld the new "cut down threaded tab" onto what remains of the original drop out. With TIG welding, you can control the heat area better than brazing, save the chrome. They also have a product that works as a "heat dam" that you place around the steel tube to localize the heat transfer. Make sure you remove the axle adjusters first.

If you cannot find a "bicycle guy" that TIG's, find a "weldor that TIG's", let him do the welding, then take the frame to your "bicycle guy" that has the proper fork end alignment tools to align the fork ends and the derailer drop out tab.

John
 
I have a Mercier from about the same time. That also has the hanger cut off. It was common at the time for people to modify the Simplex drop out by cutting it off and adding the bolt on hanger. There was even a magazine article back then showing how to do it. I am leaving it that way on my bike as a period mod and part of the bike's interesting history.
 
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