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Exploding tube
Patched a tube the other day, put it in the tire and back on the wheel,
and was pumping it up, when BANG! the tube blew, with a noise like a gunshot. I had partially pumped up and then deflated the thing, too, before giving it the normal pump-up. Did I create a pinch flat, or what? The patch was still intact, but there was a long rip in the tube where it had split. Along the center line of this rip was an odd, butterfly-shaped hole, looking something like this: |\ /| | \/ | | || | | /\ | |/ \| I put on a new tube and made sure it was well-centered and well into the tire, then pumped it up cautiously (while wearing earplugs, just in case): No problem. Any clues as to what happened the first time? I had ridden on the exploding tube for a while, and the puncture I fixed was a tiny hole. One last detail: the tube might had been a little wet, from the find-the-leak procedure. But I've never heard of water causing a blowout. Sheesh, that kind of thing can give you a start... AMG |
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#2
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On Thu, 19 Aug 2004 00:57:17 GMT, -
wrote: Patched a tube the other day, put it in the tire and back on the wheel, and was pumping it up, when BANG! the tube blew, with a noise like a gunshot. I had partially pumped up and then deflated the thing, too, before giving it the normal pump-up. Did I create a pinch flat, or what? The patch was still intact, but there was a long rip in the tube where it had split. Along the center line of this rip was an odd, butterfly-shaped hole, looking something like this: |\ /| | \/ | | || | | /\ | |/ \| I put on a new tube and made sure it was well-centered and well into the tire, then pumped it up cautiously (while wearing earplugs, just in case): No problem. Any clues as to what happened the first time? I had ridden on the exploding tube for a while, and the puncture I fixed was a tiny hole. One last detail: the tube might had been a little wet, from the find-the-leak procedure. But I've never heard of water causing a blowout. Sheesh, that kind of thing can give you a start... AMG Howdy, I know that when I have pinched 'em, I have gotten just the result you have described. I will also add that pumping them up indoors is to risk ringing ears for just that reason. I have been amazed at the difference when I have had tires pop outdoors. HTH, -- Kenneth If you email... Please remove the "SPAMLESS." |
#3
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On Thu, 19 Aug 2004 00:57:17 GMT, -
wrote: snip Oh.... from the title of the post I had assumed you were referring to our dear friend, DRS. :-) ducks back to alt.sys.pdp10 before they notice I'm missing Mike http://www.corestore.org 'As I walk along these shores I am the history within' |
#4
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- wrote:
Patched a tube the other day, put it in the tire and back on the wheel, and was pumping it up, when BANG! the tube blew, with a noise like a gunshot. I had partially pumped up and then deflated the thing, too, before giving it the normal pump-up. Did I create a pinch flat, or what? The patch was still intact, but there was a long rip in the tube where it had split. Along the center line of this rip was an odd, butterfly-shaped hole, looking something like this: |\ /| | \/ | | || | | /\ | |/ \| I put on a new tube and made sure it was well-centered and well into the tire, then pumped it up cautiously (while wearing earplugs, just in case): No problem. Any clues as to what happened the first time? I had ridden on the exploding tube for a while, and the puncture I fixed was a tiny hole. One last detail: the tube might had been a little wet, from the find-the-leak procedure. But I've never heard of water causing a blowout. A tube can't blow like that unless it escapes from the tire. IOW, your tire was not properly seated on the rim. The tire's bead popped off the rim, then the tube extruded out though the resulting space and blew. Try this: Install the tire and tube, pump it up to very low pressure (maybe 15 psi) then stop and carefully examine the tire to be sure it's evenly seated on the rim. Tires have a thin molded line just outside the bead wire. Be sure this line is equidistant from the rim all the way around, on both sides. Wrestle the tire into place if it's not. Once the tire's straight, pump to full pressure. You should be fine. -- --------------------+ Frank Krygowski [To reply, remove rodent and vegetable dot com, replace with cc.ysu dot edu] |
#5
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- wrote in message . ..
Patched a tube the other day, put it in the tire and back on the wheel, and was pumping it up, when BANG! the tube blew, with a noise like a gunshot. I had partially pumped up and then deflated the thing, too, before giving it the normal pump-up. Did I create a pinch flat, or what? The patch was still intact, but there was a long rip in the tube where it had split. Along the center line of this rip was an odd, butterfly-shaped hole, looking something like this: |\ /| | \/ | | || | | /\ | |/ \| I put on a new tube and made sure it was well-centered and well into the tire, then pumped it up cautiously (while wearing earplugs, just in case): No problem. Any clues as to what happened the first time? I had ridden on the exploding tube for a while, and the puncture I fixed was a tiny hole. One last detail: the tube might had been a little wet, from the find-the-leak procedure. But I've never heard of water causing a blowout. Sheesh, that kind of thing can give you a start... AMG I agree with Frank's assessment on making sure the bead is seated before pumping to full pressure. One thing I do to help this process is to pump the tire up to 20 psi, then roll it across the shop floor while pushing down hard on the top. This seems to help the bead get in the proper position. Smokey |
#6
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Frank Krygowski wrote:
Try this: Install the tire and tube, pump it up to very low pressure (maybe 15 psi) then stop and carefully examine the tire to be sure it's evenly seated on the rim. Tires have a thin molded line just outside the bead wire. Be sure this line is equidistant from the rim all the way around, on both sides. Wrestle the tire into place if it's not. Once the tire's straight, pump to full pressure. You should be fine. Back until the early 70s, you could buy a 27 1/8" tire and put it on and pump it up and no problem. Then tires began selling (at discount stores) with ``Does not fit Schwinn rims'' tags. This was always mysterious to me. Anyway they fit my rims fine, and I take it it was pre-warning you about some ongoing problem that the tire manufacturers were taking the other side of. Nowadays, every tire is a struggle to get on evenly. Is it possible that _every_ rim is effectively whatever a Schwinn rim was in those days, now? == Easiest way, soap up the bead. Otherwise no amount of wrestling and inflating and deflating will get the tire centered and you'll be riding with thumps forever. (26x2" tire for me, nowadays). -- Ron Hardin On the internet, nobody knows you're a jerk. |
#7
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Ron Hardin wrote:
Back until the early 70s, you could buy a 27 1/8" tire and put it on and pump it up and no problem. Then tires began selling (at discount stores) with ``Does not fit Schwinn rims'' tags. This was always mysterious to me. Anyway they fit my rims fine, and I take it it was pre-warning you about some ongoing problem that the tire manufacturers were taking the other side of. Nowadays, every tire is a struggle to get on evenly. Is it possible that _every_ rim is effectively whatever a Schwinn rim was in those days, now? I think the "Schwinn rims" describe the non-hooked rims of the past that were prone to blowout, because there was no hook to hold the tire against the rim. When I worked in a shop, these were the ones that would pop off the rim as they were being inflated. I hated them for that reason. Seating a modern tire against the rim is trivial compared to the old days. As long as you don't get the tube caught between the tire and the rim, and you seat the rim at the valve, blowouts are unlikely. Thank goodness for that. -- terry morse Palo Alto, CA http://bike.terrymorse.com/ |
#8
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On Thu, 19 Aug 2004 22:42:34 +0000, Ron Hardin wrote:
Frank Krygowski wrote: Try this: Install the tire and tube, pump it up to very low pressure (maybe 15 psi) then stop and carefully examine the tire to be sure it's evenly seated on the rim. Tires have a thin molded line just outside the bead wire. Be sure this line is equidistant from the rim all the way around, on both sides. Wrestle the tire into place if it's not. Once the tire's straight, pump to full pressure. You should be fine. Back until the early 70s, you could buy a 27 1/8" tire and put it on and pump it up and no problem. Then tires began selling (at discount stores) with ``Does not fit Schwinn rims'' tags. This was always mysterious to me. Anyway they fit my rims fine, and I take it it was pre-warning you about some ongoing problem that the tire manufacturers were taking the other side of. My wife's early-90s Schwinn uses tubulars. No tire you can get at a discount store is going to fit. Nowadays, every tire is a struggle to get on evenly. Is it possible that _every_ rim is effectively whatever a Schwinn rim was in those days, now? == Easiest way, soap up the bead. Otherwise no amount of wrestling and inflating and deflating will get the tire centered and you'll be riding with thumps forever. (26x2" tire for me, nowadays). Easiest way, use a foldable tire. The bead is so supple that it easily slips over the rim into place. That might not be an option for your 26x2, though. I was pleasantly suprised at how easy R&R-ing a 700x23 Specialized Turbo was, but then, I'm used to using tire irons to wrestle with motorcycle tires. The bicycle tire was shockingly easy. -- Chris BeHanna Software Engineer (Remove "allspammersmustdie" before responding.) I was raised by a pack of wild corn dogs. |
#9
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On Sat, 21 Aug 2004 06:23:30 GMT, Chris BeHanna
wrote: Easiest way, use a foldable tire. The bead is so supple that it easily slips over the rim into place. That might not be an option for your 26x2, though. I was pleasantly suprised at how easy R&R-ing a 700x23 Specialized Turbo was, but then, I'm used to using tire irons to wrestle with motorcycle tires. The bicycle tire was shockingly easy. Hi, I have had the opposite results, finding tires with wire beads easier to install than folding tires. I just installed some new Conti Ultra Gatorskins 700x25 and they went on without anymore effort then I think is needed. On the other hand, I sore hands when I was done installing a set of Conti Attack/Force, on the same wheels. In all my limited experience wired beads have been easier. Life is Good! Jeff |
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