Derailer hanger helicoil?
09-12-16, 12:41 PM
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Derailer hanger helicoil?
I was straightening a bended derailer hanger on a steel frame earlier and noticed that the thread was damaged - not catastrophically, but still. Made me wonder if there's a relatively easy solution for this kind of thing in the form of a helicoil, or any other alternative to having someone braze new material in the hanger.
09-12-16, 12:47 PM
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If the threads are not too bad, you may be able to thread a RD mounting bolt through the back to chase the threads. However, you may find (as I recently did when in the same situation) that the threads were damaged too much to be saved. Maybe it would have held in my case, but I didn't want to run the risk of sending a RD into the spokes and loosing the hanger altogether. Thus, on the suggestion of JohnDThompson, I bought this and it's working fine:
Wheels MFG Drop Out Saver
Note they come in thick and narrow versions, so make sure you get the right one for your dropout.
(Slash beat me to it while I was typing. Agree that you should try a tap or chasing from the back first.)
Wheels MFG Drop Out Saver
Note they come in thick and narrow versions, so make sure you get the right one for your dropout.
(Slash beat me to it while I was typing. Agree that you should try a tap or chasing from the back first.)
09-12-16, 12:48 PM
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Helicoil (the brand) does not make a product in that size/thread pitch (10mm by either 1mm or 26tpi, depending on if Campy or ISO) however there are similar "framesaver" dropout hanger repair inserts (typically solid, not a "coil", but will do the same) that are available from such sellers as biketoolsetc.com and maybe Nova or even your LBS can get thru QBP (maybe).
^AH! Faster typists have already pointed you to the Wheels Mfg. solution, that's as good if not better than any other brand.^
^AH! Faster typists have already pointed you to the Wheels Mfg. solution, that's as good if not better than any other brand.^
