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This morning I wanted to go to the lake/get some exercise so I grabbed my dad's bike (I don't know why I didn't grab mine) and rode there. On the way back I was pedaling up a hill and the rear gears started grinding and the wheel stopped turning. I thought the chain had just come off but when I got off the bike I realized that the entire rear derailleur had snapped off and got tangled up in the spokes. I carried the bike to the house and found out that the thing holding the derailleur on had bent. No idea how it happened but it did. Sorry for the shitty pictures.
Here it is from the side, you can't really see it's bent but it gives you more of an idea of what the piece is. It's the thing on the far right.
Now my question: Is that one little piece replaceable? Or would I have to buy a whole fork?