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Re-threading a RD hanger?

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Re-threading a RD hanger?

Old 03-22-19, 10:06 AM
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Tandem Tom
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Re-threading a RD hanger?

So I am going over my touring bike LHT, and getting a new RD. I notice that the threads are quite worn out. I know there are a few options but would like to get your ideas. I do work PT at a bike shop and we have the Helicoil supplies. But I was wondering if the idea of adding some "weld" and then drill and re-tap would be a better option? My nephew has a might welder. Would this be the appropriate tool?
​​​​​​As we are getting ready for a 3 month eurEur tour I want to address these concerns.
Thanks!!
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Old 03-22-19, 10:21 AM
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Just checked with our other shop and unfortunately we don't have the Helicoil for the RD. So that leaves the welding idea or I buy a Helicoil kit.
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Old 03-22-19, 11:49 AM
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unterhausen
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you don't have that size helicoil tap either? There are threaded sleeves that I like a bit better than a helicoil. Wheels manufacturing kit is a bit much for just one bike. Not sure if there are others.
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Old 03-22-19, 01:08 PM
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An older type of damaged Rear derailleur hanger repair part goes in from the inside ,
you use a tapered reamer to clean up what's left of the thread, steel frame, right?
repair part, It's hardened steel , it jams in with its own taper..
thereafter to use a wrench to hold it by its hex head , while you unscrew the RD from the outside..
borrowing image from below .. only need 1..

Problem Solvers (QBP offered) has a substitute held on with your QR Skewer.. (G'gl finds that one EZ)




...

Last edited by fietsbob; 03-23-19 at 02:27 PM.
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Old 03-22-19, 01:58 PM
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Would a stripped thread repair compound hold up in this application? Loctite makes one.
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Old 03-22-19, 04:05 PM
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Hanger repair

Thread in the derailleur, if you can torque it down a bit without it spinning you are fine. It does not need a ton of torque to be safe. Loctite makes a thread repair filler and a metal filler. Those will back up your installation. Filling the part with silver an drilling and tapping it is also an option. As you can control the paint damage and keep it isolated on the drop out which is at little risk of rusting out due to thickness. The threads may look bad but be ok. I have delt with some sever issues with a good number of messed up hangers and they are all fixable.
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Old 03-23-19, 07:18 AM
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10 x 1 mm Helicoil Kit, tap, drill and 10 inserts $25.50 on Amazon
https://www.amazon.com/Thread-Repair.../dp/B06Y5H77T4

No paint burning, removal no glue to come loose do it right do it once.
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Old 03-23-19, 10:39 AM
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The Wheels Mfg "dropout saver" is probably the easiest fix:


https://www.amazon.com/Wheels-Manufa.../dp/B000AO7C4I

After that, helicoil. Or melt brass into the damaged threads and cut new threads into the brass. Or replace the dropout entirely.
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Old 03-23-19, 11:21 AM
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You could probably polish and clean everything up and braze those dropout savers in place.
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Old 03-23-19, 12:22 PM
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A question about the Helicoil. The info,ma may I am not seeing it, does not seem to indicate how long the Helicoil insert is. If they are longer that's the dropout is thick would I have a problem grinding it down?
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Old 03-23-19, 04:07 PM
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Originally Posted by Tandem Tom View Post
A question about the Helicoil. The info,ma may I am not seeing it, does not seem to indicate how long the Helicoil insert is. If they are longer that's the dropout is thick would I have a problem grinding it down?
I have ground some down and no problems, put the helicoil all the way in and grind from the back side
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Old 03-23-19, 04:41 PM
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I think 10x1 is a pretty common thread size, so you should be able to get the helicoil at any auto parts store.

That is, unless you wish to go with 10mmx26tpi (Campagnolo).

I think I've only helicoiled a spark plug, which is meant to pretty much stay put a lot of the time.
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Old 03-23-19, 05:49 PM
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WSteve, thanks for your reply. A few videos I have seen suggest using Loctite Red.
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Old 03-23-19, 09:05 PM
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helicoils have prongs to keep them in place. I don't know if you can find one as short as a dropout
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Old 03-24-19, 03:24 PM
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I think my course of action is to go with Wheels Manufacturing Dropout Saver. Thanks for all the replies!
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