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Inner Tube Issue
#1
In the spring I installed a new Fenix 26 x 1.90/2.125 inner tube on my
year old mountain bike front wheel. It has been fine all summer until my last
ride this fall. The following day after my ride both front and rear tires were flat.
I thought that they might have lost air due to the cooler temperatures.
But that was not the case. The tubes had failed. The tubes were inflated
to the recommended 50psi indicated on the tire sidewall before my ride. I have
attached photos of the front inner tube in two places. In one photo you
can see where the failure is. There are bumps in this area and others as
shown in the other photo. I have yet to remove the rear tube but I expect
to see the same issue. I checked the rim tape and it was fine. Does this
indicate weak spots in the inner tube? What could be the possible causes
of this? Are there tubes that are stronger than others. It's weird that both
front and rear tubes failed at the same time. I'm glad it didn't happen
during my ride.


       
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#2
Hmm, seems that your photos didn't upload with the first try.
Merida Scultura 5000 (2015)
Merida Big Nine 400 (2019)
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#3
Without seeing the pic I must say it sounds like you ran over something. I had a puncture that created a slow leak. made it home and later that evening found the tire flat. looked in the tire and found a super fine wire strand in there.
Nobody ever said "I wish I would have gotten less of a bike!"

Cervelo S5
Cannondale F29 1 alloy Lefty
Trek X-01 Crossbike
2017 Trek Farley 7
71 Ral Professional
72 Ral International
73 Ral Grand Sports
73 Ral Competition
74 Ral Super course
74 Ral Granprix
74 Paramount
2017 Trek Domane SLR 6

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#4
(10-17-2019, 06:46 AM)Zviedrs Wrote:  Hmm, seems that your photos didn't upload with the first try.

I have tried attaching the photos again. They are two small jpg files. It shows the two uploaded file names but when I click on "View Attachments" in the editor it does not show them. I don't know what is going on.
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#5
(10-17-2019, 12:35 PM)jbur1 Wrote:  I have tried attaching the photos again. They are two small jpg files. It shows the two uploaded file names but when I click on "View Attachments" in the editor it does not show them. I don't know what is going on.

Problem solved Smile
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#6
(10-16-2019, 11:41 PM)jbur1 Wrote:  In the spring I installed a new Fenix 26 x 1.90/2.125 inner tube on my
year old mountain bike front wheel. It has been fine all summer until my last
ride this fall. The following day after my ride both front and rear tires were flat.
... There are bumps in this area and others as
shown in the other photo. I have yet to remove the rear tube but I expect
to see the same issue. I checked the rim tape and it was fine. Does this
indicate weak spots in the inner tube?
I'd guess those bumps are a weakness in the tube wall. Sometimes, defective products do come down the assembly line. I would have tried inflating the tubes, and immersing them in a tub of water to see if there are any tiny bubbles coming from the lumps. Also hold the valve part under the water to see if it's leaking. You may have to wait a few minutes before a bubble may show, if it's a very slow leak.
If I knew how to ride a bike properly, I'd do it every time.
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#7
Looks a bit like the rim tape failed - but then you'd expect only one bump... Check the rim tape anyway.
  Reply
#8
(12-08-2019, 05:33 AM)Joe_W Wrote:  Looks a bit like the rim tape failed - but then you'd expect only one bump... Check the rim tape anyway.
He said, in his O.P. that the rim tape was fine.
If I knew how to ride a bike properly, I'd do it every time.
  Reply


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