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  1. #1
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    problem with rear derailleur

    Hey guys i think my rear derailleur might be bent. If i pedal backwards the it will drop a gear on the cassette and then the chain falls off or gets caught in the front derailleur. I know i dont pedal backwards very often but it just bothers me that when i do that happens...it also might give me an excuse to upgrade haha. heres a picture of the rear derailleur. idk if its bent or if i just need to adjust the high and low. any help is appreciated.


    data by S.Mshots, on Flickr

  2. #2
    Fat-tired Roadie
    Reputation: AndrwSwitch's Avatar
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    That looks pretty bad.

    From the picture, I'm not ready to say it's your rear derailleur and not your derailleur hanger. Can you line up your camera with the derailleur hanger? (Piece of silver metal the derailleur is bolted to.)
    "Don't buy upgrades; ride up grades." -Eddy Merckx

  3. #3
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    now that you say that i think it is the hanger...i think this is what you were talking about


    DSC_0546 by S.Mshots, on Flickr

  4. #4
    Fat-tired Roadie
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    That's exactly what I'm talking about, and it looks pretty bad to me.

    Your dealer (Trek?) can sell you a new one. People say they don't always come out of the box straight. I guess I've been lucky - I usually just buy one, and stick it on myself, at home. But the shop can do minor tweaking if necessary.

    Come to think of it, I should buy one to keep in my wedge pack.
    "Don't buy upgrades; ride up grades." -Eddy Merckx

  5. #5
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    alright thanks man! i think they did put it on straight when i got it...i think i bent it when i took a spill the other day. thats where all that dirt came from. looks like ill be going up to the dealer again this weekend they are probably tired of seeing me there haha

  6. #6
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    Both hanger and derailleur look bent. Get the hanger done and see if it can be adjusted ok just with that done.....if not then its both for the chopping block. Also a nice clean and relube of the drivetrain while you're at it.
    Rimmer - "There's an old human saying - if you talk garbage, expect pain"

  7. #7
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    alright thanks alex...hopefully its not both. now that i think of it i dont really want to spend money on the derailleur

  8. #8
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    I'm guessing it's only the hanger - the horizontal angle above the b screw seems to match the angle of horizontal piece where the cage is attached. I would just straighten the hanger and ride, but having a second one on hand is a good idea.

    After reading parktool's directions (using their tool), you may be able to do it yourself with a straightedge, ruler, and an adjustable wrench. A bike store shouldn't charge much, and it only takes a couple minutes.

    http://www.parktool.com/blog/repair-...nger-alignment

  9. #9
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    thanks for the link. i think im taking to my LBS tomorrow morning. hopefully they can fix it tomorrow so i can ride after before it warms up a lot again

  10. #10
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    got it fixed. it was only the hanger and they actually used that tool to fix it

  11. #11
    Huckin' trails
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    Your lucky that it was only the hanger...

    Mine was the hanger and the derailleur... fixed the hanger with a new one and now still the RD to go... got jam in the wheel at +20km/h and now hope it will still work... after its fixed.



    David
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    topless. that's what all mtb girls do. we go ride, get topless, have pillow fights in the woods, scissor, then ride home!

  12. #12
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    wow that sucks. yeah im glad i didnt have to replace the derailleur

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