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Context:

I need to remove my rear derailleur so that I can attach an alignment tool and straighten things out.

Images of the rear derailleur while the bike is upside-down:

Question:

Where is the derailleur's hanger's bolt that attaches the derailleur to the frame?

Solution:

  1. Find a hex wrench with a long handle (at least as long as the 3-way hex wrench from Park Tools)
  2. Turn counter-clockwise in the area circled in red by Jerry.
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2 Answers

up vote 15 down vote accepted

I've put a red circle around the hanger bolt. alt text

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I dearly wish I could upvote you and check the checkbox but I tried budging that with a 5mm hex key and it wouldn't budge, no matter how hard I tried. –  Zian Choy Nov 19 '10 at 5:21
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@Zian: Look around the backside where the bolt comes out the other side of the hanger. A few drops of thin oil (and a 20 minute or so wait for it to penetrate) may help quite a bit. –  Jerry Coffin Nov 19 '10 at 5:30
    
This is probably not the best way to do it but I don't know a better way....1 vote (and checked answer) to Jerry for the oil advice & answering the original question. 1 real-life vote to my dad for findign a 5mm hex with a long handle. -1 to myself for trying to use a travel set of hex keys. :) –  Zian Choy Nov 19 '10 at 6:20
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Jerry Coffin has correctly displayed it.

You can also see it in the context of a bare frame. In the pictured Salsa Fargo, with a black removable derailleur hanger at the rear dropouts, you can see the projection that hangs down with a hole in it. That's what the hanger bolt screws into.

Salsa fargo frame

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