Odd part

[dragnusa]

I was working my garage today trying to get everything ready for winter, I had a few bikes tucked back in the corner that I decided to get rid of. So I started breaking them down for their good parts and this was between the frame and rear derailleur of a probably early 90s huffy mountain bike. Of the 100s of bikes that has went thru my back yard I have never seen one of these before.

 

[HxCforever]

Maybe a drop out protector?

 

[g-ratter]

A bracket for a disc brake set up???

 

[ChoppeRon]

my suspicion is that it is a early replacable deraileur hanger, made necessary by constantly bending hangers welded to the frame.

 

[kingsting]

I believe that was a dropout stiffener for the bikes with index shifting.

 

[The Renaissance Man]

my suspicion is that it is a early replacable deraileur hanger, made necessary by constantly bending hangers welded to the frame.

That was my first thought. I have had something similar to that on a mountain bike that the deraileur hanger was broken on. Kind of a generic replacement part.

 

[patman73]

derailer hanger !

 

[dragnusa]

The way it was on there I don't think it was a derailleur hanger and its to early of a bike to be for a disk brake. I'm thinking it was a frame stiffener too since it mounted right next to the original drop out , Going to keep it and put it with my old oem and odd ball parts collection.