Cassette wobble

Discussion in 'Shop Talk' started by Ricekrispyota, Sep 9, 2019.



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  1. Ricekrispyota

    Ricekrispyota Member

    Name:
    Dana Weinberg
    My cassette looks like it is wobbling back and forth as I pedal, about 1/8”, and I think it might be causing the bike to try to drop from the 46t to 42t under load. The driver is tight and the cassette is tight. It doesn’t look like it from the naked eye, but could the axle be bent. The through axle slides through without issue.

    Thanks for the help.
     
    Mikie, Faust29 and pperrelle like this.
  2. pperrelle

    pperrelle Well-Known Member

    Location:
    Carlsbad
    Name:
    Paul
    Current Bike:
    Ibis Ripmo, Ripley V4 & DV9
    Maybe a bent cog making it look like it's wobbling? That can happen sometimes if you shift under load by accident.
     
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  3. DangerDirtyD

    DangerDirtyD iMTB Addict

    Location:
    CA
    Name:
    Chicken Nugget
    Current Bike:
    2018 Guerrilla Gravity SMASH
    That happened to my road bike on a SRAM cassette. I thought it was my hub, but it turns out the cassette had a plastic spacer that got crushed under the load of the cassette lock ring. I’d try removing the cassette and identifying if there is a plastic spacer somewhere in there. If so, replace it with a metal spacer and email whoever manufactured your cassette and tell them to get their asses out of their heads.
     
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  4. SnakeCharmer

    SnakeCharmer iMTB Hooligan

    Location:
    Crescenta Valley
    Name:
    Mike, aka "Ssnake"
    Current Bike:
    Vassago/Trek
    Make a short video on youtube or Pinkbike and share the link here.
     
    Mikie likes this.
  5. evdog

    evdog Well-Known Member

    Location:
    San diego
    Name:
    Evan S
    You say driver is tight and the cassette is tight - but the cassette is wobbling? That doesn't make sense.

    Some cassettes require a spacer be installed before putting on the cassette. Is that possible? I had an XD driver cassette that I really had to crank down on to fully tighten. Thought I had it tight but there was still play.
     
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  6. DangerDirtyD

    DangerDirtyD iMTB Addict

    Location:
    CA
    Name:
    Chicken Nugget
    Current Bike:
    2018 Guerrilla Gravity SMASH
    My cassette was tight but simply oscillated while it rotated.
     
    Mikie likes this.
  7. Ricekrispyota

    Ricekrispyota Member

    Name:
    Dana Weinberg
    It’s a standard Shimano XT cassette. There are plastic spacers between some of the cogs, but nothing behind it.
     
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  8. Grego

    Grego iMTB Rockstah

    Location:
    Fullerton
    Name:
    joe
    Current Bike:
    WFO9
    Freehub bearings? Could be worn or crushed.
     
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  9. evdog

    evdog Well-Known Member

    Location:
    San diego
    Name:
    Evan S
    Or a broken freehub body. I've done that before, it will cause a wobbly cassette as well.
     
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  10. Ricekrispyota

    Ricekrispyota Member

    Name:
    Dana Weinberg
    This is my main concern, as I have already broken one freehub body by this company. I'm hoping it will make it through the weekend. It doesn't seem to be causing any issues ( I figured out the shifting issue, and it had nothing to do with the cassette). Ive put about 100 miles (Wrightwood climbing miles) on it in the last four days, since I first noticed it.

    I will pull it apart on Sunday and hope for the best.

    Evdog, if I can ask, where did your freehub body break. Mine was right next to one of the pawls. I didn't notice it until I pulled the freehub body out of the wheel.
     
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  11. evdog

    evdog Well-Known Member

    Location:
    San diego
    Name:
    Evan S
    Mine was an old shimano free hub body. Cracked it right in two, when I took it into a shop the mechanic said he'd never seen that happen before...lucky me. Noticed it when the wheel started to wobble and had shifting problems both of which proceeded to get worse. Thankfully it was on a short ride, not a long one.
     
    Mikie likes this.
  12. mtnbikej

    mtnbikej J-Zilla

    Location:
    Orange
    Name:
    J M
    Current Bike:
    SC Chameleon SS, SC Hightower

    What hub? This could say a lot.
     
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  13. Ricekrispyota

    Ricekrispyota Member

    Name:
    Dana Weinberg
    It's a Niner branded hub. It came stock on a 2017 Niner Rip9 RDO 2 star build, with the Niner aluminum wheel set.
     
    Mikie likes this.
  14. mtnbikej

    mtnbikej J-Zilla

    Location:
    Orange
    Name:
    J M
    Current Bike:
    SC Chameleon SS, SC Hightower
    Pull the driver off and check the bearings in it. It is a low end hub, so i wouldn’t be surprised that they don’t last very long.
     
    Mikie likes this.
  15. Ricekrispyota

    Ricekrispyota Member

    Name:
    Dana Weinberg
    Here are the pics of the other broken hub:
    56794-fd96f27de2cdb399e69d40b5486d47ea.jpg 56795-ae590a2d740e2b475f31503844db1633.jpg

    IMG_0072.jpg

    IMG_0073.jpg
     
    Mikie and Old&InTheWay like this.
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