How does this happen?

Discussion in 'BIKE TALK' started by Grant, Oct 20, 2019.

  1. Grant

    Grant

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    I took apart the headtube on my mixte, and I noticed that half of the steerer tube was eaten away. The little crater holes confuse me even more. I am going to replace this fork.
    20191020_120535.jpg
     
  2. Psychographic

    Psychographic

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    It looks like something got into the head tube and was grinding into the surface. Was it working smoothly?

    Judging by the pic, it doesn't look like it needs to be replaced to me.
     
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  3. GuitarlCarl

    GuitarlCarl

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    There's nothing wrong with that. It was probably done before or during assembly. There's nothing that it could effect or that could have done it while in use. Look at the bearing race, it's like new. Put it back together and stop worrying about ghosts.

    Carl.
     
  4. Brian macumber

    Brian macumber

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    Looks kinda like threads in there
     
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  5. The Renaissance Man

    The Renaissance Man __CERTIFIED DIVER__ (Open Water & Open Dumpster) Pro Member

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    The fork is fine. I wouldn't hesitate to use it.
     
  6. Rust Buzzard

    Rust Buzzard

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    Some forks have marks embossed on them with build dates and such. This might be destroying the evidence of something?
     
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  7. Duchess

    Duchess

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    I've seen that on other forks and never had an issue. I'm pretty sure it's something that happens during the manufacturing process, but I can't figure out what.
     
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  8. Brian macumber

    Brian macumber

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    I think it was something to do with getting the race on.
     
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  9. Phil Fink

    Phil Fink

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    The grinding may happen when something, like a foreign object, or a ball bearing, or part of a bearing cage, gets in-between the fork tube and the head tube. Gravity usually pulls what ever it is toward that bottom cup. Another cause could be loss of bottom bearings or a bent fork tube, (but that does not look to be the case). Another cause could be the joints inside the head tube interfering with normal turns of the steering. It could use a brush of some red primer.
     
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  10. us56456712

    us56456712

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    weld splatter was ground or filed off so the race would fit, no big deal.
     
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