Brake rotor making noise when dropping bike

Rowan404
Rowan404 Posts: 104
edited July 2018 in MTB workshop & tech
Hey, just wondering. Is if normal to hear a clang from your brake rotor everytime you drop your bike? This happens for both front and back.

Comments

  • cooldad
    cooldad Posts: 32,599
    Nope.
    I don't do smileys.

    There is no secret ingredient - Kung Fu Panda

    London Calling on Facebook

    Parktools
  • JBA
    JBA Posts: 2,852
    Never noticed it on any of my bikes.
    “Life has been unfaithful
    And it all promised so so much”

    Giant Trance 2 27.5 2016 ¦ Sonder Broken Road 2021¦ Giant Revolt Advanced 2 2019 ¦ Giant Toughtroad SLR 1 2019 ¦ Giant Anthem 3 2015 ¦ Specialized Myka Comp FSR 2009
  • steve_sordy
    steve_sordy Posts: 2,453
    When you say "drop your bike", could you be more specific please.
  • 02gf74
    02gf74 Posts: 1,171
    And what do you mean by clang,

    how do you know it is coming from the rotor,

    does it happen for both rotors.

    Really need more information.
  • cooldad
    cooldad Posts: 32,599
    And when doing drops, or just dropping the bike............
    I don't do smileys.

    There is no secret ingredient - Kung Fu Panda

    London Calling on Facebook

    Parktools
  • Rowan404
    Rowan404 Posts: 104
    Yes, picking up and dropping my bike. Of course if it happens there it will happen on the trail as well.
  • Rowan404
    Rowan404 Posts: 104
    02GF74 wrote:
    And what do you mean by clang,

    how do you know it is coming from the rotor,

    does it happen for both rotors.

    Really need more information.
    I don't see what else would make that sound at the front. It happens on both front and rear.
  • Rowan404
    Rowan404 Posts: 104
    And clang as in a clang that a metal object would make.
  • cougie
    cougie Posts: 22,512
    Don't drop it then ? Sorted.
  • steve_sordy
    steve_sordy Posts: 2,453
    Rowan404 wrote:
    Yes, picking up and dropping my bike. Of course if it happens there it will happen on the trail as well.

    Discs hitting the ground?

    But why would you drop your bike? Don't you care about it?
  • JGTR
    JGTR Posts: 1,404
    It’s resonance, it won’t happen on the trail. Now go ride your bike.
  • The Rookie
    The Rookie Posts: 27,812
    As above, how do you know it’s from the rotor? Pads moving in the calliper is more likely and perfectly normal.
    Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.
  • JBA
    JBA Posts: 2,852
    Post a video of the problem.
    ‘Clang’ doesn’t really tell us much.
    “Life has been unfaithful
    And it all promised so so much”

    Giant Trance 2 27.5 2016 ¦ Sonder Broken Road 2021¦ Giant Revolt Advanced 2 2019 ¦ Giant Toughtroad SLR 1 2019 ¦ Giant Anthem 3 2015 ¦ Specialized Myka Comp FSR 2009
  • JGTR
    JGTR Posts: 1,404
    Unless your brakes rotors are loose, it’s resonance, most likely your tyres are over inflated and/or your suspension is set wrong (too firm/over inflated)
  • Rowan404
    Rowan404 Posts: 104
    Sorry about the confusion, I thought it would be obvious. I am not throwing my bike on the ground. I am picking up the bike and dropping it on its tires. It is definitely coming from the rotors.
  • Rowan404
    Rowan404 Posts: 104
    JGTR wrote:
    Unless your brakes rotors are loose, it’s resonance, most likely your tyres are over inflated and/or your suspension is set wrong (too firm/over inflated)
    Rotors are tight. So are calipers. Suspension is set up to correct sag and tires are as low as they can be so that I don't bash my rims.
  • JBA
    JBA Posts: 2,852
    It's just resonance as the brake pads move when you drop the bike.
    Ignore it and go and ride.
    “Life has been unfaithful
    And it all promised so so much”

    Giant Trance 2 27.5 2016 ¦ Sonder Broken Road 2021¦ Giant Revolt Advanced 2 2019 ¦ Giant Toughtroad SLR 1 2019 ¦ Giant Anthem 3 2015 ¦ Specialized Myka Comp FSR 2009
  • dirkpitt74
    dirkpitt74 Posts: 518
    Are they one piece or floating rotors?
    If floating it'll be the rotor moving on the carrier.
    _______________
    Chris

    Current FS: 2017 Nukeproof Mega 275
    Current HT: 2017 Nukeproof Scout 275
    Kids Carrera Blast Refurb/Upgrade
    My Blog - Midlife MTB Mutterings

    Previous FS: 2014 Nukeproof Mega TR 26'er
  • 02gf74
    02gf74 Posts: 1,171
    ^^^^ good one, formula r1, or was it hope saw, from a few years back would have the rivet loosen so the steel braking surface would move in relation to the alloy carrier.
  • Rowan404
    Rowan404 Posts: 104
    They are sram centerlock. I assumed it was resonance. Just wasn't sure if it was supposed to be happening.

Categories