Strange Request - Post Pic of bottom yoke- Mtbr.com
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  1. #1
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    Strange Request - Post Pic of bottom yoke

    Hey All . . .

    I'm looking to see the bottom yoke on non Norco fat bikes (I have a bigfoot). The Bigfoot's bottom yolk has open holes (3/8 inch) which allows water and sediment into the frame and then into the BB.

    Oh . . . please state make and model as well.

    Tks

  2. #2
    Loud tyres save lives
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    Have you got a similar photo of your own bike you can post so I can get an idea exactly what you're looking for?

    John
    2014 Trek Fuel Ex 8
    2015 Trek Farley 6
    2016 Trek Stache 7

  3. #3
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    Motobecane Lurch 22"

    Strange Request - Post Pic of bottom yoke-lurch-bb.jpg

    Is this what you are looking for?

  4. #4
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    You got it Rex.
    Even a shot from above would be fine.

    Rex . . . is that hole threaded?

  5. #5
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    Quote Originally Posted by NLSpruce3 View Post
    You got it Rex.
    Even a shot from above would be fine.

    Rex . . . is that hole threaded?
    The hole with the blue arrow is threaded (but you already knew that)

    The hole with the pink arrow, I don't know. I can check tonight.

    Strange Request - Post Pic of bottom yoke-lurch-bb-.jpg

  6. #6
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    I'll comment that the Salsa Mukluk does not have the hole, but our LBS has seen numerous cases of water/grime getting trapped in there from getting in the frame somewhere (the other hole?). They actually suggested drilling out a hole to prevent buildup. It would be easy enough to plug, then pull plug when you want to drain.

  7. #7
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    Thanks . . . I actually meant the blue one.
    The pink one is probably not threaded as it is a "drain hole" for the BB.

    OUW . . . its my experience that water and debris enters through the blue hole.

  8. #8
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    Quote Originally Posted by NLSpruce3 View Post
    The pink one is probably not threaded as it is a "drain hole" for the BB.
    In some cases it may be threaded for use with a cable guide for a bottom pull FD.

  9. #9
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    Re: Strange Request - Post Pic of bottom yoke

    Quote Originally Posted by NLSpruce3 View Post
    Thanks . . . I actually meant the blue one.
    The pink one is probably not threaded as it is a "drain hole" for the BB.

    OUW . . . its my experience that water and debris enters through the blue hole.
    The blue "hole" is a fender mount braze on. If you think water is getting in through it, put on a bolt.

    And neither of those holes are even close to 3/8" in diameter.
    mtbtires.com
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  10. #10
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    The pink hole is also threaded, it is probably an option for one of those plastic cable guides for the derailleurs.



    As shiggy points out it is relatively small, about an eight inch.

    EDIT. Just saw bme107's response.

  11. #11
    nothing to see here
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    Quote Originally Posted by rex615 View Post
    The pink hole is also threaded, it is probably an option for one of those plastic cable guides for the derailleurs.



    As shiggy points out it is relatively small, about an eight inch.

    EDIT. Just saw bme107's response.
    Restraining myself from a couple of inappropriate, tongue in cheek responses.
    I see hills.

    I want to climb them.

  12. #12
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    Quote Originally Posted by Stevob View Post
    Restraining myself from a couple of inappropriate, tongue in cheek responses.
    Pink was probably not a good color choice, come to think of it neither would have brown.

  13. #13
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    Quote Originally Posted by rex615 View Post
    Pink was probably not a good color choice, come to think of it neither would have brown.
    yeah, and I doubt Shiggy would be happy about his eight inch being called small.
    I see hills.

    I want to climb them.

  14. #14
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    Tisk Tisk :-)

  15. #15
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    put a grease zert in there (red arrow) and pump the BB full

  16. #16
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    Most BB's have a sleeve on the inside to protect the bearings from water/dirt. Frames almost always have venting holes on them for the welding process, so it is near impossible to make the frame itself water tight.

  17. #17
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    Quote Originally Posted by OUWxGuesser View Post
    I'll comment that the Salsa Mukluk does not have the hole, but our LBS has seen numerous cases of water/grime getting trapped in there from getting in the frame somewhere (the other hole?). They actually suggested drilling out a hole to prevent buildup. It would be easy enough to plug, then pull plug when you want to drain.
    +1 - Since I'm generally not running a front or rear derailleur I have left the hole under my BB open on my Surlys to let water that gets in the seat tube drain out.

    I don't ride my bike if the hubs or BB would get submerged. I carry it. So water isn't getting in there.
    Safe riding,

    Vik
    www.vikapproved.com

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