rec.sport.unicycling · Public discussion

Wobble, Foot Placement and Q Factor

Started by trailguy · · Last activity · 3 posts · 175 views

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rec.sport.unicycling
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17 June 2007
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20 June 2007
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trailguy
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  1. Does your FOOT PLACEMENT on your pedals affect WOBBLE ?

    For example, if you place your feet wider do you experience more
    wobble??

    In other words, is your foot placement interrelated with Q factor???

    I failed to find an answer via search and I'm still trying to grasp how
    q factor results in wobble and whether foot placement on pedals plays a
    role.

    Q is, I believe, the distance between the planes created by the outer
    surface of crank arms at pedal threads. (Hope I said that right.)
    Once Q is established by hub and cranks, is the resultant wobble
    affected by foot placement on pedals????

    I guess I am trying to understand the physics at play even though I'm
    not highly educated in the science. Probably dynamics is involved, the
    "moment", etc., and maybe you physics gurus could weigh in and
    explain.

    Thanks,

    Trailguy Bill

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  2. Yes, foot placement affects stability. As does knee orientation and
    probably the way your legs move. In fact, you would find that the
    positioning of any of your limbs and even torsoe would have some effect
    on "wobble".

    They don't technically effect Q-Factor which is measured as distance
    between the pedals.

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    muzzle

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  3. Today's Coker ride experiment with foot placement makes me think that
    moving feet wider does not cause more wobble. If that's true, the
    amount of wobble may be "set" by the hub and cranks. I'm sure there is
    info, probably old, on this forum that may explain the physics of
    wobble. Danged if I could find it, though.

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