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Normal behavior hanger/dropout??

Last post 07-12-2019 9:16 AM by WildeOne. 8 replies.
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  • 06-26-2019 4:36 PM

    Normal behavior hanger/dropout??

    Hi, my bike has been really noisy on the middle of the big ring. I brought it two times to a mechanic and he noticed the following behavior. https://youtu.be/b0Ku-Ten2fk Is this normal behavior for the hanger to move when tightening the skewer ? Im pretty sure its not. It means the hanger is no more straight. Thank you Bike is a Cervelo r3. Cassette and chain are new. Tried with new hanger too.
  • 06-26-2019 8:01 PM In reply to

    • brendanh
    • Not Ranked
    • Joined on 01-27-2017
    • Sydney
    • Posts 4

    Re: Normal behavior hanger/dropout??

    I don't think it's normal; that's a lot of movement. Looking at the video, it would seem that the frame dropout is bent inwards a little bit. And when you tighten the skewer, it forces the hanger to 'follow' the bent profile of the dropout. Unless it is somehow pulling the bottom of the hanger in towards the cassette lock nut? Does it happen on a different wheel/cassette combo?
  • 06-26-2019 11:25 PM In reply to

    Re: Normal behavior hanger/dropout??

    https://youtu.be/dg83YPi7Jj0 Maybe slightly less with another wheel.
  • 06-27-2019 12:23 AM In reply to

    • brendanh
    • Not Ranked
    • Joined on 01-27-2017
    • Sydney
    • Posts 4

    Re: Normal behavior hanger/dropout??

    Still looks wrong to me...something is giving way as you clamp the skewer. Whether the dropout is bent, or the space between the dropouts is too wide, or maybe some debris stopping the hanger being properly attached flush to the dropout, or something else, I don't know. But this would bug me... Good luck.
  • 06-27-2019 9:02 AM In reply to

    • goodboyr
    • Top 10 Contributor
    • Joined on 08-16-2007
    • Thornhill, Ontario
    • Posts 968

    Re: Normal behavior hanger/dropout??

    Hanger alignment is performed with the wheel clamped into the dropout. What you are seeing is pretty normal. The derailleur hanger alignment is with reference to a clamped wheel. So just make sure the hanger screws are properly tightened and your "mechanic" uses a hanger alignment tool to adjust. A mechanic that observed this and states it's abnormal is not a good mechanic.
    Bobbo
    2015 COR
    '06 R3, Fully Internal Dura Ace 7970, Zipp 303FC Clinchers
    S5 Team, Ultegra Di2, Zipp 101
    RCA 56cm, Dura Ace 9070, Zipp 404 FC Tubbies

  • 06-27-2019 11:13 AM In reply to

    Re: Normal behavior hanger/dropout??

    Are you sure ?. In my case, it means that the hanger has to be bent for it to be straight when the wheel is tightened. Thats really weird
  • 06-27-2019 1:58 PM In reply to

    • goodboyr
    • Top 10 Contributor
    • Joined on 08-16-2007
    • Thornhill, Ontario
    • Posts 968

    Re: Normal behavior hanger/dropout??

    Yup. I am 100% sure. That's the way it works. A new hanger needs to be aligned with the right tool, every time.
    Bobbo
    2015 COR
    '06 R3, Fully Internal Dura Ace 7970, Zipp 303FC Clinchers
    S5 Team, Ultegra Di2, Zipp 101
    RCA 56cm, Dura Ace 9070, Zipp 404 FC Tubbies

  • 06-27-2019 6:32 PM In reply to

    Re: Normal behavior hanger/dropout??

    It was aligned with the tool. But i am really skeptical that a brand new hanger has to be bent or it wont be straight when the wheel is there. This defy logic considering the fact that thes hanger are so brittle.
  • 07-12-2019 9:16 AM In reply to

    Re: Normal behavior hanger/dropout??

    What Bobbo said... even a brand new hanger needs to be aligned with the wheel on and clamped.
    2009 S2, SRAM Rival, 50/34 Rotor Q-Rings, Mavic Cosmic Pro Carbons / Mavic Ksyrium SLs 7.2Kg
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