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  1. #1
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    Is my rear derailleur hanger bent?

    Hi everyone, I've seen a few similar topics but rather than hijack them for my own needs I thought I'd ask this directly.

    My upper jockey seems a little bit twisted, and while it isn't noticeable on most gears, on the smallest rear cog there is a slight clicking sound because it begins to rub against the inside of the chain. I think this might be my hanger as I had a crash a while ago and had to have it adjusted at a bike shop. The guy who did it said it was 'the best he could do', as if it could still be better.

    Here are some pics. It would also be a great help if someone could tell me what type of hanger this is, so I could buy a replacement if need be.

    http://s22.postimg.org/4vpv4ujm9/IMG_1465.jpg

    http://s18.postimg.org/c45hpky21/IMG_1468.jpg

    You may also be able to see the weirdly angled jockey. If anyone wants to see this in more detail I could take another pic or two, maybe even a video.

    Edit: Some more pictures that hopefully help. Last one I think shows what I mean by a twisted jockey. The previous ones were too large to fit in [img] tags...



    Last edited by JPeters; 01-18-14 at 04:12 PM.

  2. #2
    7-speed doomsday prepper ThermionicScott's Avatar
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    A photo straight-on from the rear would be more helpful. And you can wrap the link with [IMG] and [/IMG] tags to make the pictures show up in the thread.
    Quote Originally Posted by chandltp View Post
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  3. #3
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    It is hard to tell given the angles of your photos. If you are concerned the best course would be to find a shop with the correct alignment tool and have the job done properly.

  4. #4
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    I've updated the post with more pictures.

  5. #5
    7-speed doomsday prepper ThermionicScott's Avatar
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    Ah, that's better. The first picture makes it look crooked, not as sure about the second. One indicator of a bent RD hanger is that the chain will get noisier if you switch from one chainring to the other. That's because the lower pulley rotates to adjust for chain slack, and it will feed the chain to the cog from a slightly different position.
    Quote Originally Posted by chandltp View Post
    There's no such thing as too far.. just lack of time
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  6. #6
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    It's hard to tell from the angle, but it looks like the hanger is bent inward.

    Skip the photos and eyeball it yourself from directly behind the bike. Shift to a combination where the cage is nearly vertical. Put some kind of reference like a yardstick vertical against the right side of the wheel, touching top and bottom. Now eyeball it from behind and see if the RD cage is parallel to the reference, or pointing in at the bottom.

    There's your answer.
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    Carefully shift to the large cog in the back and the middle ring then eyeball the cage to see if it is vertical.

  8. #8
    Senior Member Wilfred Laurier's Avatar
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    it looks bent to me

    try this link to find a replacement
    http://derailleurhanger.com/

    i have never bought from them but they have been around for a while

  9. #9
    Andrew R Stewart Andrew R Stewart's Avatar
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    The third photo shows a bit of the rear der's lower knuckle which has some scars just visible. Likely scared when the der got the impact that bent in the hanger.

    When you have the new hanger in hand first try to align the old one. Usually one can align these Al hangers a few times before concerns about breaking. While your LBS should have the specific tool to do this with some care and thought aligning can be done with just an Allen wrench and a screw driver along with a good eye. If the old hanger does align well then continue using it until it is no longer serviceable. Andy.

  10. #10
    Senior Member kv501's Avatar
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    Quote Originally Posted by Wilfred Laurier View Post
    it looks bent to me

    try this link to find a replacement
    http://derailleurhanger.com/

    i have never bought from them but they have been around for a while
    A new DR hanger is more than half the price of the Park alignment gauge, and then you can fix the problem again in the future if you need to. Well worth the investment in my opinion. You'd be suprised how often people's shifting problems are from a bent hanger.
    Last edited by kv501; 01-18-14 at 07:52 PM.

  11. #11
    Constant tinkerer FastJake's Avatar
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    Quote Originally Posted by kv501 View Post
    A new DR hanger is more than half the price of the Park alignment gauge, and then the problem is solved permanently. We'll worth the investment in my opinion. You'd be suprised how often people's shifting problems are from a bent hanger.
    If it's a minor bend the Park alignment tool is fine, even on aluminum. And while a new hanger should theoretically be straight they aren't necessarily dead on. After buying the Park tool I check the hangers of every bike I put together and while it's usually not life changing it takes one thing out the equation and leads to better shifting.

    IMO if you have a few bikes it's a worthwhile investment. I can't remember what I paid for mine but I got it used on ebay and it works just fine.
    Why "derailer" is the correct way to spell the gear-change mechanism: sheldonbrown.com/derailer.html

  12. #12
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    Quote Originally Posted by kv501 View Post
    A new DR hanger is more than half the price of the Park alignment gauge, and then the problem is solved permanently. We'll worth the investment in my opinion. You'd be suprised how often people's shifting problems are from a bent hanger.
    This is a popular misconception. Very often, newly installed hangers don't come up perfectly square and need to be corrected. So going new doesn't replace the tool. Generally I straighten existing ones, and in many cases do so by eye using my straightedge across the wheel as a frame reference.
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    An ounce of diagnosis is worth a pound of cure.

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    “One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

    WARNING, I'm from New York. Thin skinned people should maintain safe distance.

  13. #13
    Senior Member kv501's Avatar
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    Quote Originally Posted by FastJake View Post
    If it's a minor bend the Park alignment tool is fine, even on aluminum. And while a new hanger should theoretically be straight they aren't necessarily dead on. After buying the Park tool I check the hangers of every bike I put together and while it's usually not life changing it takes one thing out the equation and leads to better shifting.

    IMO if you have a few bikes it's a worthwhile investment.
    I've bought 3 bikes brand new, and all 3 needed the hanger aligned. I got the tool a long time ago after fighting with a DR adjustment and it made my life a lot easier.

  14. #14
    Senior Member kv501's Avatar
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    Quote Originally Posted by FBinNY View Post
    This is a popular misconception. Very often, newly installed hangers don't come up perfectly square and need to be corrected. So going new doesn't replace the tool. Generally I straighten existing ones, and in many cases do so by eye using my straightedge across the wheel as a frame reference.
    I didn't word my first post very well, I meant that I was in favor of buying the tool. Mine has paid for itself many times.

  15. #15
    Constant tinkerer FastJake's Avatar
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    Quote Originally Posted by kv501 View Post
    I didn't word my first post very well, I meant that I was in favor of buying the tool. Mine has paid for itself many times.
    Now I understand. Yeah, the tool is great.
    Why "derailer" is the correct way to spell the gear-change mechanism: sheldonbrown.com/derailer.html

  16. #16
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    If you don't have the tool, but you have a spare back wheel you can use it to true the hanger. Remove the Der. and screw the axle from the spare RR wheel into it (they both have the same thread. 10X1mm). If they are parallel the hanger is good. If not use the extra wheel as a lever to straighten the hanger.

  17. #17
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    I doesn't look that bent. You could try do straighten it out using a allen key. Just put it in where you tighten the RD to the hanger and pull up. I worked for me.

  18. #18
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    Wow, lot of great advice here. Thanks a lot! I'll have a look around for an adjustment tool and if I can't find one, try aligning it without then. Much appreciated everyone!

  19. #19
    Senior Member rydabent's Avatar
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    Unexplained bad shifting when all the RD adjustments appear to be right can usually be traced to a bent dropout, or a bent RD.

  20. #20
    coprolite fietsbob's Avatar
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    If you care enough , have it checked in a shop with their alignment tool ..
    then its going to be right ..

    If it does not matter then sending pictures, here, may be good enough.

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