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#31
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broken spokes, cassette/drive train compatability
Michael Press writes:
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 |
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#32
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broken spokes, cassette/drive train compatability
Michael Press wrote:
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 |
#33
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broken spokes, cassette/drive train compatability
Ted Bennett wrote: Michael Press wrote: 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? |
#34
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broken spokes, cassette/drive train compatability
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. |
#35
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broken spokes, cassette/drive train compatability
On 9 Nov 2005 09:55:41 -0800, "Mister2u" wrote:
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 |
#36
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broken spokes, cassette/drive train compatability
On Sat, 05 Nov 2005 10:30:41 -0800, jim beam wrote:
wow, by that rationale, every car, washing machine, every computer, every elevator motor, every air conditioning compressor, [insert any number of mass production processes here] would be utter garbage. but they're not. They pretty much are, compared to the same built with a lot of attention to detail, time, and usage of the same materials and fabrication techniques. That a car built that way costs 100-500.000 bucks instead of 20 is beside the point. Jasper |
#37
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broken spokes, cassette/drive train compatability
On 5 Nov 2005 18:52:01 -0800, "D'ohBoy" wrote:
wrote: ... humans are able to sense spoke twist ... A mark on one side of the spoke from a sharpie (or other marking pen) will make it visually obvious.... Not to a machine, though. That is, it's possible to devise machinery that can see it, but it's not on the current generation of machines. Jasper |
#38
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broken spokes, cassette/drive train compatability
Jasper Janssen writes:
... humans are able to sense spoke twist ... A mark on one side of the spoke from a Sharpie (or other marking pen) will make it visually obvious... Not to a machine, though. That is, it's possible to devise machinery that can see it, but it's not on the current generation of machines. We don't want no steenkin' seeing machines! The solution to the problem is dirt simple and used by manual skilled manual builders. A machine can do this much more easily. When I think how many years I badgered the wheel building machine people about their "problem". They were so proud of their machines that they couldn't hear that wheels that came off their machines were less than ideally built. Spoke prep! You must be blind to invent spoke glue and not recognize the problem that did not exist before building wheels with machines... especially when you are the guys who lowered the tension setting. Jobst Brandt |
#39
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broken spokes, cassette/drive train compatability
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