Tube deflating for no good reisin!!!
#1
Sir Fallalot
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Tube deflating for no good reisin!!!
Today I wanted to go shopping with my urban SS, but notice the fronttire is flat. Take off wheel, remove tube that is still slightly inflated, so I conclude there is no large hole. Inflate tube some more and put it under water to look for bubbles.
NO BUBBLES!!!!
Facts:
NO BUBBLES!!!!
Facts:
- 700x37-47C Kenda tube, 1 year old, previously used with some cheap-ass Kenda tire. Schrader valve. (Suomeksi: Autoventiili)
- Schwalbe Big Apple 700x48C tire, kevlar protected, recommended pressure 30-70 PSI. I pumped it up to 50 PSI. Tire is brand new.
- Used as front wheel.
- This setup was used about 10 times, for a total of 250 Km.
Last edited by wroomwroomoops; 05-21-07 at 02:11 PM.
#3
Sir Fallalot
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Originally Posted by barba
When was the last time you aired up the tire?
The tire, as I said, is brand new. Now, granted, I don't know what you mean by "aired up", but 1 week ago this tire was still in its shrink-wrap. If that answers your question...?
#4
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Aired-up........inflated..........pumped up........pressurized
#6
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Presta or schrader valve? Schrader valves are the same as the ones found on cars, presta valves are smaller in diameter and are different internally.
#7
Mechanic/Tourist
Kind of hard to diagnose in print -have you reinflated to see what happens? May be a jj flat. (jerk joke - friend deflates your tire for laughs).
#9
Sir Fallalot
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Originally Posted by redirekib
Presta or schrader valve? Schrader valves are the same as the ones found on cars, presta valves are smaller in diameter and are different internally.
#10
Sir Fallalot
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Originally Posted by cny-bikeman
Kind of hard to diagnose in print -have you reinflated to see what happens? May be a jj flat. (jerk joke - friend deflates your tire for laughs).
Jerk joke: I thought about this, being the mean Scot that I am (not really, but I do have scottish genes in me), I thought about "the damn kids" when I saw the tire having no holes. However, the problem with this theory is that the front tire was in a place rather difficult to access, while the rear tire was much more exposed, and yet, not deflated at all. If I was to do a JJ on someone's bike, I'd go for the low-hanging fruit. That the vent cap was in place, is perhaps another indication that it wasn't a JJ. Again, as I said, the front wheel was in a hard-to-access place, and just unscrewint the cap would represent some difficulty - not to mention, this is Finland, and people are generally really nice. Furthermore, the bike was in the building's storage room, so only my neighbors had access to it, and there are no "damn kids" in this building, just elderly people, and a few couples with babies. Neither of whom would have the physique, dexterity and motivation to do this. Expecially not the motivation.
#11
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Originally Posted by cny-bikeman
Kind of hard to diagnose in print -have you reinflated to see what happens? May be a jj flat. (jerk joke - friend deflates your tire for laughs).
Damn tubes!
#12
kona dew
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Originally Posted by wroomwroomoops
I thought about "the damn kids" when I saw the tire having no holes.
#13
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Originally Posted by mito2008
how could they sabotage the tube/tire without puncturing it?
#15
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UPDATE: I checked just now, and the tire is almost unacceptably soft. I don't think there's even 10 PSI in it. I left the bike in my apartement to have "controlled laboratory conditions" so to say. The tire deflated from about 50 PSI to about nothing in 9 hours.
What the heck?
What the heck?
#16
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Remove the tube, inflate it until it is 1 and 1/2 times its normal size and check for leaks again and make sure to check the valve. If you do find a leak be sure and check the inside of the tire for the culprit.
#17
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Update #2: I decided to use the immersion technique again, added a bit of soap to the water, so that even the smallet bubble is registered, and this time I was luckier with my groping! There's a microscopic leak on one of the longitudinal seams. I am not sure if I can patch this, as the seam has a "contour". Should I even bother? OTOH, the hole is invisible to the naked eye.
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Originally Posted by wroomwroomoops
Update #2: I decided to use the immersion technique again, added a bit of soap to the water, so that even the smallet bubble is registered, and this time I was luckier with my groping! There's a microscopic leak on one of the longitudinal seams. I am not sure if I can patch this, as the seam has a "contour". Should I even bother? OTOH, the hole is invisible to the naked eye.
#20
Sir Fallalot
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Originally Posted by redirekib
Sand the seam down, it will patch fine.
Inflated to 60 PSI 1.5 hours ago, let's see....
#21
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Originally Posted by thomas_cho
patch it. Why does it matter if its visible or not to the naked eye?
Last edited by wroomwroomoops; 05-21-07 at 07:17 AM.
#23
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Originally Posted by Stacey
A good Reisen!
Well, the patch is holding.
So, what I have learned from this: more groping and squeezing!
#24
Senior Member
Yes, you're correct. With the tube outside of the tyre, there's no structural support so it will barely require any pressure at all to balloon it up. You probably had at most 5psi in the tube and that's why you couldn't find the hole the 1st time. At operating pressures of 60psi on the other hand, a lot more air will escape through that tiny hole.
#25
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Originally Posted by DannoXYZ
Yes, you're correct. With the tube outside of the tyre, there's no structural support so it will barely require any pressure at all to balloon it up. You probably had at most 5psi in the tube and that's why you couldn't find the hole the 1st time. At operating pressures of 60psi on the other hand, a lot more air will escape through that tiny hole.