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Re: broken spokes, cassette/drive train compatability

Started by Lisp949 · · Last activity · 7 posts · 355 views

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01 / Original postRe: broken spokes, cassette/drive train compatabilityLisp949 · 7 Nov 2005 02 / This pagePosts 1–7Page 1 of 1 · chronological order 03 / Latest replyPost #7Jasper Janssen · 10 Nov 2005

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Original section
Cycling Equipment
Published
7 November 2005
Last activity
10 November 2005
Original author
Lisp949
Posts
7
Discussion status
Public discussion
Total views
355
Views / 30 days
3
Topics
Drivetrain compatibilitySpoke countInner tubesPunctures and flatsRear derailleurs

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  1. Original post
    Lisp949
    Archived post
    #1

    Thank you all.

    I am not sure about my rim width, but it seems to have always worked
    with
    a 700x35 tube. I recently replaced it with a tube that is marked
    700x20-28.
    Do you think the (presumably) wide rim/narrow tube combiantion could
    bring broken spokes? I might have to be more cautions here. When the
    tiny tube is fully inflated, the valve does not fully stick out of the
    rim,
    looking very funny.

    Here is what Sheldon Brown have to say:
    http://sheldonbrown.com/tire-sizing.html#width
    But he is talking about TIRE sizing.

    Thanks again.

    Lisp949 said:

    Hello,

    The spokes on my rear wheel keep breaking (three so far in
    two weeks). Every time I replaced a spoke, the truing was
    OK, but it just did not stop spokes from breaking. Could
    there be something wrong that I did not see?

    The current drive train is seven-speed. I was thinking of
    putting in place a wheel with a six-speed cassette. I
    suppose there will be fewer broken spokes. Will the six-
    speed cassette work with the seven-speed chain and rear
    derailleur?

    Thanks.

    Report
  2. Michael Press
    Archived post
    #2

    In article
    <[email hidden]>,

    Lisp949 said:

    Thank you all.

    I am not sure about my rim width, but it seems to have always worked
    with
    a 700x35 tube. I recently replaced it with a tube that is marked
    700x20-28.
    Do you think the (presumably) wide rim/narrow tube combiantion could
    bring broken spokes? I might have to be more cautions here. When the
    tiny tube is fully inflated, the valve does not fully stick out of the
    rim,
    looking very funny.

    Be aware that using an undersized tube is a risk. A risk
    that is not worth taking. An undersized tube inflated
    expands to fill the space allotted. It is blown up like a
    balloon. The tube walls are in tension. If (or when) the
    tube is punctured it can rip and deflate instantly. At
    speed you might lose control.

    A properly sized tube is already the size of the space it
    is intended to fill, when inflated the tube is the same
    size as when deflated, and the walls are not in tension.

    --
    Michael Press
    The rest of the world.

    Report
  3. Joe Riel
    Archived post
    #3
    Michael Press said:

    Be aware that using an undersized tube is a risk. A risk
    that is not worth taking. An undersized tube inflated
    expands to fill the space allotted. It is blown up like a
    balloon. The tube walls are in tension. If (or when) the
    tube is punctured it can rip and deflate instantly. At
    speed you might lose control.

    This seems unlikely, the pressure required to increase an undersized
    inner tube from its nominal size to that of the tire being minimal.

    Joe

    Report
  4. Ted Bennett
    Archived post
    #4
    Michael Press said:

    A properly sized tube is already the size of the space it
    is intended to fill, when inflated the tube is the same
    size as when deflated, and the walls are not in tension.

    That statement is untrue. No tube fully fills the space inside a tire
    and the rim well, until it is inflated, so the walls are indeed in
    tension. The amount of tension is certainly higher in an undersized
    tube, and I would agree that makes it more likely to flat suddenly.

    --
    Ted Bennett

    Report
  5. gds
    Archived post
    #5
    Ted Bennett said:
    Michael Press said:

    A properly sized tube is already the size of the space it
    is intended to fill, when inflated the tube is the same
    size as when deflated, and the walls are not in tension.

    That statement is untrue. No tube fully fills the space inside a tire
    and the rim well, until it is inflated, so the walls are indeed in
    tension. The amount of tension is certainly higher in an undersized
    tube, and I would agree that makes it more likely to flat suddenly.

    --

    Agreed! How else could indiviual tubes be designed (as they are) to fit
    a range of different tire sizes?

    Report
  6. Mister2u
    Archived post
    #6
    Quoted message said:

    I am not sure about my rim width, but it seems to have always worked
    with
    a 700x35 tube. I recently replaced it with a tube that is marked
    700x20-28.
    Do you think the (presumably) wide rim/narrow tube combiantion could
    bring broken spokes? I might have to be more cautions here. When the
    tiny tube is fully inflated, the valve does not fully stick out of the
    rim,
    looking very funny.


    I've asked at bike shops about spoke breakage they tell me that after
    one breaks they all tend to go.In my experiece this is frequently(but
    not always)true.

    Report
  7. Jasper Janssen
    Archived post
    #7
    Mister2u said:
    Quoted message said:

    I am not sure about my rim width, but it seems to have always worked
    with
    a 700x35 tube. I recently replaced it with a tube that is marked
    700x20-28.
    Do you think the (presumably) wide rim/narrow tube combiantion could
    bring broken spokes? I might have to be more cautions here. When the
    tiny tube is fully inflated, the valve does not fully stick out of the
    rim,
    looking very funny.


    I've asked at bike shops about spoke breakage they tell me that after
    one breaks they all tend to go.In my experiece this is frequently(but
    not always)true.

    If you replace a few, and then within a few months more go, it's time to
    respoke the wheel.

    Jasper

    Report

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