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It's only your mech hanger which is broken. It bolts onto the rear right dropout of the frame. You can normally find replacements if you do some Googling with your frame make and model.
There is no guarantee that it won't happen again though. Someone with more experience with these types of failures might be able to tell you what may have caused it.
Ndeipi
How did this happen?/ what would LFGSS do?
I was riding in shoreham (great ride!) when I went to change the front cog with my Shimano double tap. This has been a little sticky for a year or so. A shop guy told me was just the age of the parts and wasn’t a lot I could do…
I was trying to keep the chain fairly central. Often the back cog wouldn’t move up when I hit the left hand shifter, but I found when I moved the back cogs shifter that would sometimes allow the front cog to finally move from the little to big.
However this time disaster struck. And as I did this the chain fell off, next I believe as my pedal leg drove round, part of the frame then snapped off the mech hanger. This I think then pushed the derailer into the back wheel and through the back wheel.
Questions. Is this frame written off? Any idea how I snapped the frame of my bike? Should I have replaced the shifter and derailer long ago?
Shout out to the kind man who gave me a lift to my car an hours walk away.