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Can anyone identify this part and where and how it goesenter image description here before the bike buckles under us when being ridden

I know its not a bottle holder as I have already installed those. Looks like a guard for something that has two screws close to one another

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    Derailleur guard, intended to protect the rear derailleur from impacts, many cheap bikes without break away dropouts use them as to avoid tweaking the frame from an impact with a tree, stone etc. Some people think they work others do not. – Nate W Sep 21 '16 at 18:20
  • @NateWengert That's an answer, not a comment. – Criggie Sep 21 '16 at 19:43
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It's a rear derailleur guard.

Their effectiveness is often discussed on here.

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