Cycling Equipment · Public discussion

Re: disk brake debate - summary II

Started by James Annan · · Last activity · 3 posts · 453 views

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Cycling Equipment
Published
19 October 2005
Last activity
19 October 2005
Original author
James Annan
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  1. jim beam said:
    Quoted message said:

    An interesting spin on the available data. Your 20kN force has been
    totally blown away. Wouldn't it be best to admit you were mistaken
    there? Jobst has a point about fretting over time for indentation
    reinforcement.

    i'm delighted that number's "blown away"! i said from the beginning
    that my figure was a guesstimate.

    You said "a rough calc shows the clamping force for a normal skewer is
    ~>20kN", which has been shown to be out by a factor of about 3 from a
    plausible upper limit and more like an order of magnitude according to
    actual measurements.

    No doubt you'll be "delighted" once you work out that the rest of your
    argument is similarly wrong.

    James
    --
    James Annan
    see web pages for email
    http://www.ne.jp/asahi/julesandjames/home/
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  2. In article <[email hidden]>,

    James Annan said:
    jim beam said:
    Quoted message said:

    An interesting spin on the available data. Your 20kN force has been
    totally blown away. Wouldn't it be best to admit you were mistaken
    there? Jobst has a point about fretting over time for indentation
    reinforcement.

    i'm delighted that number's "blown away"! i said from the beginning
    that my figure was a guesstimate.

    You said "a rough calc shows the clamping force for a normal skewer is
    ~>20kN", which has been shown to be out by a factor of about 3 from a
    plausible upper limit and more like an order of magnitude according to
    actual measurements.

    No doubt you'll be "delighted" once you work out that the rest of your
    argument is similarly wrong.

    That 5 mm skewer will plastically deform at 20 kN tension.

    --
    Michael Press

  3. James Annan said:
    jim beam said:
    Quoted message said:

    An interesting spin on the available data. Your 20kN force has been
    totally blown away. Wouldn't it be best to admit you were mistaken
    there? Jobst has a point about fretting over time for indentation
    reinforcement.

    i'm delighted that number's "blown away"! i said from the beginning
    that my figure was a guesstimate.

    You said "a rough calc shows the clamping force for a normal skewer is
    ~>20kN", which has been shown to be out by a factor of about 3 from a
    plausible upper limit and more like an order of magnitude according to
    actual measurements.

    No doubt you'll be "delighted" once you work out that the rest of your
    argument is similarly wrong.

    Actually, it isn't.

    But if it helps you to make a buck or three to think otherwise, great.

    E.P.

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