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#21
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Performance brand tube failures
Yes; the ones I had were made by Kenda, who doesn't seem to
be able to perfect the stem/tube juncture, no matter what label they are sold under. Ken wrote: Anyone been having trouble with Performance Brand tubes failing at the valve stem? My buddy has had at least 4 of them recently that have failed right at the base of the stem. We checked the hole in the rim for sharp edges, but didn't find any problem. |
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#22
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Performance brand tube failures
kwalters wrote:
Yes; the ones I had were made by Kenda, who doesn't seem to be able to perfect the stem/tube juncture, no matter what label they are sold under. Ken wrote: Anyone been having trouble with Performance Brand tubes failing at the valve stem? My buddy has had at least 4 of them recently that have failed right at the base of the stem. We checked the hole in the rim for sharp edges, but didn't find any problem. I had a bunch of Peformance tubes fail that way as well as a bunch of Specialized. Probably made in the same factory. Others have reported a similar rash of stem failures. I'm sure it was some flaw in the manufacturing process in some big Asian plant. |
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Performance brand tube failures
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Performance brand tube failures
On Fri, 24 Jun 2005 11:27:28 -0400, "Bill" wrote:
One other possibility. I had a pair of Hutchinson tires a couple of years ago that caused tube failures adjacent to the stem. The tire's bead area was so large that the tube by the valve was suspended between the two beads and could not seat against the bottom of the rim. Over time the tube would fail at the unsupported area that was next to the valve. Uhm.. what do you mean, bead area was so large? And what was special about the valve area? Tires usually expand a little less at the valve area than elsewhere, so it sounds to me like you were simply having a problem with inappropriately sized tubes. Jasper |
#26
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Performance brand tube failures
Jasper Janssen writes:
One other possibility. I had a pair of Hutchinson tires a couple of years ago that caused tube failures adjacent to the stem. The tire's bead area was so large that the tube by the valve was suspended between the two beads and could not seat against the bottom of the rim. Over time the tube would fail at the unsupported area that was next to the valve. Uhm... what do you mean, bead area was so large? And what was special about the valve area? Tires usually expand a little less at the valve area than elsewhere, so it sounds to me like you were simply having a problem with inappropriately sized tubes. Not having a clear description of the failure mode, determining its cause is difficult. If this is about stem separation from the tube, where the stem can be subsequently separated from the tube manually, then it is a manufacturing flaw. We've been through this about a year or so ago when this was a widespread failure. At the time the faithful placed blame on the valve stem nut that was said to have pulled the stem from the tube. That this is not the case can easily be shown by screwing the valve stem (knurled) nut on as tight as is manually possible before inflation and noting that the nut is free and loose from internal pressure, a force far larger than the nut can exert when tightened with thumb and forefinger. The nut has its purpose but only for folks who pump their tires with a frame fit pump with rigid valve chuck. I suppose CO2 cartridges are the norm these days from what I read here. These are not aided by valve stem nuts nor are extended valve stems for riders of the aero persuasion. Jobst Brandt |
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