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Spoke head popped off
Hi All,
While riding this weekend I broke a spoke. I found it odd that the spoke head basically popped off. The entire spoke, including the elbow section, was intact. These are 36-spoke wheels with less than 1000 km on them. Is this a normal area for a spoke to fail from stress? Or is it just a bad spoke? Otherwise the wheel has been trouble-free so far. Regards, Anthony |
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#2
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Spoke head popped off
"Anthony DeLorenzo" wrote in message ... Hi All, While riding this weekend I broke a spoke. I found it odd that the spoke head basically popped off. The entire spoke, including the elbow section, was intact. These are 36-spoke wheels with less than 1000 km on them. Is this a normal area for a spoke to fail from stress? Or is it just a bad spoke? Otherwise the wheel has been trouble-free so far. Regards, Anthony I have had this happen a few times. Mass produced, small metal parts, slight internal defect, put it together. Get a new nipple installed and do not worry... Bruce |
#3
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Spoke head popped off
Anthony DeLorenzo wrote:
Hi All, While riding this weekend I broke a spoke. I found it odd that the spoke head basically popped off. The entire spoke, including the elbow section, was intact. These are 36-spoke wheels with less than 1000 km on them. in this day and age, that indicates a low-end cheapo wheelset, and thus inferior spoke quality. Is this a normal area for a spoke to fail from stress? Or is it just a bad spoke? Otherwise the wheel has been trouble-free so far. it happens - it's a function of spoke quality. simply replace with a known brand you can get from your lbs, then enjoy. [several more may fail if the wheel is not re-spoked, and unless you do that yourself, it may not be economic vs. buying new wheels.] |
#4
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Spoke head popped off
Anthony DeLorenzo Wrote: Hi All, While riding this weekend I broke a spoke. I found it odd that the spoke head basically popped off. The entire spoke, including the elbow section, was intact. These are 36-spoke wheels with less than 1000 km on them. Is this a normal area for a spoke to fail from stress? Or is it just a bad spoke? Otherwise the wheel has been trouble-free so far. Regards, Anthony Sapim says: "The spoke head breaks off (this is unusual) - Bad positioning of the head in the hub (e.g. a slant position puts all the pressure on one side of the bottom of the spoke head. As a result the head snaps off, the so-called "bottle cap effect"). - The hub flange is too thick and is not suited to the length of the spoke bend (i.e. all the pressure is on the head, which will be excessively stressed and rip off). - If the wrong cross pattern is chosen, e.g. cross 4 on large flange hubs, the spoke bend can rub against the adjacent spoke head. This should be avoided." I have never had it happen in over 500,000 miles of riding, but I have seen it in a couple of wheels. -- daveornee |
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Spoke head popped off
On May 20, 5:59 am, jim beam wrote:
in this day and age, that indicates a low-end cheapo wheelset, and thus inferior spoke quality. Not the case here... These are DT Competition spokes laced to XT hubs. |
#6
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Spoke head popped off
On May 20, 6:24 am, daveornee daveornee.39p...@no-
mx.forums.cyclingforums.com wrote: Sapim says: "The spoke head breaks off (this is unusual) - Bad positioning of the head in the hub (e.g. a slant position puts all the pressure on one side of the bottom of the spoke head. As a result the head snaps off, the so-called "bottle cap effect"). - The hub flange is too thick and is not suited to the length of the spoke bend (i.e. all the pressure is on the head, which will be excessively stressed and rip off). - If the wrong cross pattern is chosen, e.g. cross 4 on large flange hubs, the spoke bend can rub against the adjacent spoke head. This should be avoided." I have never had it happen in over 500,000 miles of riding, but I have seen it in a couple of wheels. Thanks for that. Looking at that list, the first one is a good possibility. I built these wheels myself and may have had a spoke head that wasn't quite bedded in to the hub correctly. I'll take a look at the wheel closer, but the replacement spoke was fine over the next 400 km of our ride. |
#7
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Spoke head popped off
"Anthony DeLorenzo" wrote in message
... Hi All, While riding this weekend I broke a spoke. I found it odd that the spoke head basically popped off. The entire spoke, including the elbow section, was intact. These are 36-spoke wheels with less than 1000 km on them. Is this a normal area for a spoke to fail from stress? Or is it just a bad spoke? Otherwise the wheel has been trouble-free so far. There are bad spokes in every lot. It would be prohibitively expensive to inspect spokes as well as necessary to prevent the very occasional failure of this kind. Replace the spoke. If a second spoke breaks start looking for problems such as bad die for forming the heads - it will leave marks. |
#8
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Spoke head popped off
Anthony DeLorenzo wrote:
On May 20, 5:59 am, jim beam wrote: in this day and age, that indicates a low-end cheapo wheelset, and thus inferior spoke quality. Not the case here... These are DT Competition spokes laced to XT hubs. in that case, all you can do is replace - statistically, it won't happen again before the wheel's worn out. fwiw, sapim have a much larger radius under their spoke heads than d.t., so should be much less prone to this kind of fatigue. |
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