Where RD meets frame. The frame hole is stripped.
Is this repairable? The screw that is used to screw on the RD when placed into the frame moves loosely and does not tighten(suggesting that the frame hole is stripped)
Remove the rear derailleur and see if it is the mounting hole or the bolt that is stripped. If it is the mounting hole then it can be repaired using a Helicoil or similar thread repair insert with the proper thread I would think. Check with your LBS as to whether they can do it.
Many modern frames, aluminum and CF, have replaceable derailleur hangers. If so then order a new hanger and install it.
If you don't have a replacable derailleur hanger, you can use one of these:
Scroll down to items 17 and 18 depending on how thick your dropout is. You will need a 15/32" drill bit to clean up the damaged threads and allow the Dropout Saver to fit. You can buy one of these locally or Bike Tools has them too:
Thank you both for your crucial advice. I should be back on the streets soon!
Have used the Helicoil method to fix a stripped crank pedal hole and a stem bolt hole on a threadless stem. Both have worked for many years (and Miles) without any problems. Your RD hanger sounds like a good candidate.
Originally Posted by tatfiend
Helicoils do work but for a stripped derailleur hanger, the "Dropout Savers" are much easier to install. Just drill out the old threads and plug in the bushing.
Originally Posted by Deanster04