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Performance brand tube failures



 
 
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  #11  
Old June 25th 05, 05:30 AM
(PeteCresswell)
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Default Performance brand tube failures

Per :
Anyone been having trouble with Performance Brand tubes failing at the
valve stem?


No but my current batch of 2.25" MTB tubes is so old that it probably doesn't
mean much - bad batches and all that.

Only negative I seen w/Performance tubes is that so many of them have such long
valve stems. Probably not a physical problem - just looks kind of weird.
--
PeteCresswell
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  #12  
Old June 25th 05, 10:35 AM
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Default Performance brand tube failures

I got 3 luna light 700c tubes and 2 of the 3 were bad. The tubes got holes
or splits in them and I never even rode them. I installed them by hand
carefully and overnight in the garage the tire went flat. I am bringing them
back for a refund this weekend.

cel



"(PeteCresswell)" wrote in message
...
Per :
Anyone been having trouble with Performance Brand tubes failing at the
valve stem?


No but my current batch of 2.25" MTB tubes is so old that it probably

doesn't
mean much - bad batches and all that.

Only negative I seen w/Performance tubes is that so many of them have such

long
valve stems. Probably not a physical problem - just looks kind of weird.
--
PeteCresswell



  #13  
Old June 25th 05, 02:23 PM
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Default Performance brand tube failures

Yeah, they told me to bring them back for a refund too, but they are in
the trash. They did seem surprised when I told them that I think that
they have a quality problem.
These are the light weight road tubes, BTW.

  #14  
Old June 25th 05, 02:26 PM
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Default Performance brand tube failures



Bill wrote:
wrote in message
oups.com...
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.

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.

I ride the Huthcinson tires ( not with Performance tubes) and have no problem with valve stem failures


  #16  
Old June 25th 05, 05:56 PM
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Default Performance brand tube failures

On 25 Jun 2005 06:29:08 -0700, wrote:



(PeteCresswell) wrote:
Per
:
Anyone been having trouble with Performance Brand tubes failing at the
valve stem?


No but my current batch of 2.25" MTB tubes is so old that it probably doesn't
mean much - bad batches and all that.

Only negative I seen w/Performance tubes is that so many of them have such long
valve stems. Probably not a physical problem - just looks kind of weird.
--
PeteCresswell


Long valve stems MIGHT be part of the problem if you don't have deep
wheels. So much of the valve stem protrudes from the wheel that it
makes a pretty long lever that you attach the pump to. If you use a
hand pump, the rocking back and forth might weaken an already poorly
joined valve stem.


Dear DD,

Paradoxically, shouldn't a longer valve stem reduce any
rocking, not increase it?

The stem itself offers scarcely any sideways resistance to
the kind of forces involved in holding the end of a pump
attached to the valve and shoving on the handle.

What matters is how far the pump end, braced against a knee
or the ground (or perhaps just the governor of California's
mighty left hand), jolts when the rider pumps.

A short valve should magnify the rocking, while a long valve
should reduce it. The diagrams below show a short and a long
valve. Imagine the top of each valve mmoving the same
distance sideways toward my knee as I pump:

x = tops of both valves
y = same sideways jolt -- on pump stroke
x-y
|
|
x-y |
| |
__|_ _|_

If valves are 3 and 6 units high, the same sideways movement
from x to y (equal to 1) rocks the short 3-unit-high valve
about 19.5 degrees, but rocks the tall 6-unit-high valve
only about 9.6 degrees.

Whatever's causing the tubes to fail, I doubt that it's the
length of the valves.

Carl Fogel
  #18  
Old June 25th 05, 10:43 PM
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Default Performance brand tube failures

Carl, looks like you put a bit of thought into this. I can't fault your
analysis, as long as the same sideways movement y is applied to both.
But I bet that the longer stem could be pulled thru a greater arc with
the same force applied. I need to dust off the old slide rule.

 




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