View Poll Results: Is my disk brake rotor bent?

1. This poll is closed
  • It doesn't matter, you should have gone with Cannondale instead

    0 0%
  • most likely

    0 0%
  • probably not, but employees didn't adjust it correctly

    1 100.00%
Results 1 to 4 of 4
  1. #1
    mtbr member
    Join Date
    Sep 2012

    New question here. Brand new Trek 6300 disk brake repeating rubbing sound

    I have purchased a new Trek 6300 disk bike today and when I turn the bike upside down and spin the rear wheel I can hear a repeating sound of disk brake rotor rubbing against the brake pad. Otherwise the wheel seems to spin with no wobbling left-right. The sound is not strong, however friction will stop the wheel in less than 10 seconds if I spin it manually. I am not as concerned about the rubbing as I am with the sound not being constant. Could the brake rotor be bent although new?
    Attached Thumbnails Attached Thumbnails Brand new Trek 6300 disk brake repeating rubbing sound-img_0813%7E1.jpg  

    Brand new Trek 6300 disk brake repeating rubbing sound-img_0816%7E1.jpg  

  2. #2
    mtbr member
    Reputation: mitzikatzi's Avatar
    Join Date
    Sep 2008
    A Poll

    Take back to the shop.

    Center the brakes. Google how to if your not sure.

    Check pistons aren't sticking. Again Google.

    Hold a pencil from the chain stay to the edge of the rotor. Spin wheel. See if rotor is bent. Possible. Either straighten rotor (Google can help) or take back to the shop.

    The system might be overfilled with DOT fluid.

    Remove and replace the wheel and make sure it is "centered"
    Last edited by mitzikatzi; 09-21-2012 at 07:24 PM.
    Duct tape iz like teh Force. It has a Lite side and a Dark side and it holdz the Universe together.

  3. #3
    Big Gulps, Alright!
    Reputation: Berkley's Avatar
    Join Date
    May 2007
    Probably bent. Even brand new rotors aren't perfect.
    Axle Standards Explained

    Founder at North Atlantic Dirt, riding & writing about trails in the northeast.

  4. #4
    mtbr member
    Join Date
    Sep 2012
    Chances are it is simply that your calipers are not centered with the brake rotor. It is a simple and easy thing to fix. If you can take it back to the bike shop where they should adjust it for you for free. While there have them show you how to do it. It is a handy thing to know and like I said, it's easy to do. Enjoy the new bike. It looks really sharp.

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