frame wobble

Discussion in 'Motorized Bicycle General Discussion' started by \./, Apr 16, 2013.

  1. \./

    \./ Member

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    have any of you guys had a frame that just wasn't quiet straight?how did you straighten it out?
     
  2. Mr. Minecraft

    Mr. Minecraft Visionary

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    If I had a bike that weak or flimsy, I would trash it and get a better one. Weak frames and engines do not mix well.
     
  3. BigBlue

    BigBlue New Member

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  4. culvercityclassic

    culvercityclassic Well-Known Member

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    I built mine in a poor mans jig... Never had an issue. P.M. And I will send you the link...
     
  5. culvercityclassic

    culvercityclassic Well-Known Member

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  6. RicksRides

    RicksRides New Member

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    I've built 5 frames now using your jig, CCC. I love it all 5 have turned out great, thanks once agian. Rick .wee.
     
  7. 2door

    2door Moderator
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    Wobble and out of alignment are not the same thing. I'd like some clarification about what the OP is asking. If the frame is flexing or "wobbling" something is very wrong. It could be there is a broken weld at a critical point.

    The problem might also be in the wheels. If one or both are out of true then a wobble could result. Even the cheapest department store bikes shouldn't wobble, even with an engine installed.
    I think we're looking at a potentially serious problem and certainly a safety issue. My advice would be not to ride the bike until the source of the problem has been found and fixed. Examine the frame carefully for any sign of a broken weld or frame tube. Elevate the bike and spin the wheels to check them for concentricity and lateral alignment. Check bearings and axle nuts and handlebar attachment.

    Tom
     
  8. rustycase

    rustycase Gutter Rider

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    dnutTom is correct. you really should identify the problem before getting out in traffic, at speed.

    Alignment of a bicycle frame can be 'adjusted' by setting down on the ground, grabbing ahold of the frame with your hands, and pushing here or there with your foot.
    (they are kinda ez to bend, so be cautious!)

    Wobble could be caused by loose bearings, (wheel, or neck), spoke mis-adjustment, or a bad tire casing with a burble in it. A blow-out at speed is NOT a fun thing!
    A speed wobble can be caused by too little trail in the front fork.

    Best
    rc

    Oh, and I just thought of another.... the extended-back seatposts that seem to be popular with some folks can cause poor weight distribution on the cycle which will lead to poor control authority on the front wheel and this may amplify any condition leading to a wobble.
    Weight should be properly balanced, front/rear, for decent steering and braking.
    .

    dnut
     
  9. \./

    \./ Member

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    the frame is a bit out of allignament, and has a "wobble" in the downtube. not a wobble as in it wobbles or flexes, but a wobble as in it has a bot of an "S" shape

    thanks CCC, that jig looks great.
     

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