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Date: 10 Oct 2007 11:34:37
From: wle
Subject: Tire Blowoff >> Could A Too-Small Tube Be The Problem?
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so
newish hutchinson carbon comp clincher tires [foldable] 700cx23mm
first time i had ever used them, though they are not new
mavic rims
never had a blowoff before
i had a flat, so had to change the tube
picked up a tube from the pile
it seemed a mite small at the time
i was able to install though, and inflate to 100 psi
10 miles of riding, boom
tire comes off rim for about 4", opposite the stem
of course the tube blew out and exploded, 4" split
replacing the tube, i was able to see it said "26 x 1 to 1.25 inches"
of course i have 700c rims
so it was too small
would that cause the tire to come off the rim though?
if that is true, then i shouldn;t worry now, i used a regular 700c
tube
also, the tire says
"inflation 125 psi, max inflation 125 psi"
since i only used 100 psi, can that be a factor?
i have never used folding tires before, maybe that is relevant?
can;t see how though
would like it to all be due to the too small tube
maybe there was a little tube between tire and rim
but how would that force the tire off the rim?
or maybe there is just something wrong with this tire?
i hate to keep riding and not know why it happened
wle.
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Date: 14 Oct 2007 19:36:33
From: wle
Subject: Re: Tire Blowoff >> Could A Too-Small Tube Be The Problem?
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it must have been installation error compounded with the too-small
tube
of course i put a right-size tube in, it;s been fine at 120 psi ever
since
4 days, 100 miles or so
wle.
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Date: 13 Oct 2007 21:43:13
From: Tom Sherman
Subject: Re: Tire Blowoff >> Could A Too-Small Tube Be The Problem?
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wle who? wrote:
> so
> newish hutchinson carbon comp clincher tires [foldable] 700cx23mm
> first time i had ever used them, though they are not new
> mavic rims
> never had a blowoff before
>
> i had a flat, so had to change the tube
> picked up a tube from the pile
> it seemed a mite small at the time
> i was able to install though, and inflate to 100 psi
> 10 miles of riding, boom
> tire comes off rim for about 4", opposite the stem
> of course the tube blew out and exploded, 4" split
>
> replacing the tube, i was able to see it said "26 x 1 to 1.25 inches"
> of course i have 700c rims
> so it was too small
>
> would that cause the tire to come off the rim though?
> if that is true, then i shouldn;t worry now, i used a regular 700c
> tube
>
> also, the tire says
> "inflation 125 psi, max inflation 125 psi"
> since i only used 100 psi, can that be a factor?
> i have never used folding tires before, maybe that is relevant?
> can;t see how though
>
> would like it to all be due to the too small tube
>
> maybe there was a little tube between tire and rim
> but how would that force the tire off the rim?
>
> or maybe there is just something wrong with this tire?
> i hate to keep riding and not know why it happened
I had a too small tube split while mounted. It did not blow the tire off
the rim, but rather made a loud hissing sound for about 20 seconds. (The
bike was parked inside my efficiency apartment at the time.)
--
Tom Sherman - Holstein-Friesland Bovinia
Beer - It's not just for breakfast anymore!
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Date: 10 Oct 2007 15:35:54
From: Qui si parla Campagnolo-www.vecchios.com
Subject: Re: Tire Blowoff >> Could A Too-Small Tube Be The Problem?
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On Oct 10, 12:34 pm, wle <w...@mailinator.com > wrote:
> so
> newish hutchinson carbon comp clincher tires [foldable] 700cx23mm
> first time i had ever used them, though they are not new
> mavic rims
> never had a blowoff before
>
> i had a flat, so had to change the tube
> picked up a tube from the pile
> it seemed a mite small at the time
> i was able to install though, and inflate to 100 psi
> 10 miles of riding, boom
> tire comes off rim for about 4", opposite the stem
> of course the tube blew out and exploded, 4" split
>
> replacing the tube, i was able to see it said "26 x 1 to 1.25 inches"
> of course i have 700c rims
> so it was too small
>
> would that cause the tire to come off the rim though?
> if that is true, then i shouldn;t worry now, i used a regular 700c
> tube
>
> also, the tire says
> "inflation 125 psi, max inflation 125 psi"
> since i only used 100 psi, can that be a factor?
> i have never used folding tires before, maybe that is relevant?
> can;t see how though
>
> would like it to all be due to the too small tube
>
> maybe there was a little tube between tire and rim
> but how would that force the tire off the rim?
>
> or maybe there is just something wrong with this tire?
> i hate to keep riding and not know why it happened
>
> wle.
Take a tube out of the tire and inflate with a compressor and see how
BIG it gets..MUCH bigger than the rim/wheel..much wider than the 23c
tire so no..too small doesn't make a tire blow off. Most likely the
tire wasn't engaged in the rim bead all way 'round or the tube was
pinched between tire and rim...operaor error, probably.
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Date: 10 Oct 2007 17:25:33
From: David L. Johnson
Subject: Re: Tire Blowoff >> Could A Too-Small Tube Be The Problem?
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wle wrote:
> so
> newish hutchinson carbon comp clincher tires [foldable] 700cx23mm
> first time i had ever used them, though they are not new
> mavic rims
> never had a blowoff before
It can happen.
> replacing the tube, i was able to see it said "26 x 1 to 1.25 inches"
> of course i have 700c rims
> so it was too small
>
> would that cause the tire to come off the rim though?
Well, indirectly. It might have caused you to get a bit of the tube
pinched between the tire and rim, which would prevent the tire from
seating properly in the rim hook, and would cause the blow-off. Always
check for bits of the tube being pinched like that, and check after you
get a few pounds of pressure that tire is seated properly.
> if that is true, then i shouldn;t worry now, i used a regular 700c
> tube
>
> also, the tire says
> "inflation 125 psi, max inflation 125 psi"
> since i only used 100 psi, can that be a factor?
No
> i have never used folding tires before, maybe that is relevant?
> can;t see how though
You have to make sure the tire is seated into the rim properly,
independent of bead material.
>
> would like it to all be due to the too small tube
>
> maybe there was a little tube between tire and rim
> but how would that force the tire off the rim?
Like I said above, the tire wouldn't be seated in the hook, and also the
pressure would tend to separate the tire from the rim just like you
would do with tire irons.
--
David L. Johnson
As far as the laws of mathematics refer to reality, they are not
certain, and as far as they are certain, they do not refer to reality.
-- Albert Einstein
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Date: 10 Oct 2007 12:43:31
From: wle
Subject: Re: Tire Blowoff >> Could A Too-Small Tube Be The Problem?
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> Most likely it was installation error. Either you got a fold of tube
> caught between the rim and the tire's bead (which might have been
> easier for you to do with a wrong-sized tube),
oh
there were no 'folds' at all
this thing was stretched like a rubber band
most likely it was way down in the spoke channel, at least before
inflating
> or you failed to
> adequately seat the tire's bead before fully inflating.
possibly
> If the tire
> is anomalously large for the rim, or the rim anomalously small for the
> tire, then that could contribute to blowoff.
nah, they fit just about the same as any other tire/rim pair
wle.
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Date: 10 Oct 2007 12:40:51
From: wle
Subject: Re: Tire Blowoff >> Could A Too-Small Tube Be The Problem?
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is there such a thing as a tire that is just not very 'hook-y'?
maybe it;s made oddly and just doesn;t hold the tire rim very well
you would think folding tires would be more susceptible to that, with
no wire bead
anyway, i will inspect it for that, i know the section that let go
..if i get home on the @#$ thing :)
wle.
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Date: 10 Oct 2007 19:33:15
From: Chalo
Subject: Re: Tire Blowoff >> Could A Too-Small Tube Be The Problem?
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wle wrote:
>
> 10 miles of riding, boom
> tire comes off rim for about 4", opposite the stem
> of course the tube blew out and exploded, 4" split
>
> replacing the tube, i was able to see it said "26 x 1 to 1.25 inches"
> of course i have 700c rims
> so it was too small
>
> would that cause the tire to come off the rim though?
No.
> also, the tire says
> "inflation 125 psi, max inflation 125 psi"
> since i only used 100 psi, can that be a factor?
No.
> i have never used folding tires before, maybe that is relevant?
Probably not.
> would like it to all be due to the too small tube
Most likely it was installation error. Either you got a fold of tube
caught between the rim and the tire's bead (which might have been
easier for you to do with a wrong-sized tube), or you failed to
adequately seat the tire's bead before fully inflating. If the tire
is anomalously large for the rim, or the rim anomalously small for the
tire, then that could contribute to blowoff. But if it was just a
mistake you made upon installation, it won't necessarily reoccur.
Chalo
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Date: 10 Oct 2007 12:32:57
From: landotter
Subject: Re: Tire Blowoff >> Could A Too-Small Tube Be The Problem?
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On Oct 10, 1:34 pm, wle <w...@mailinator.com > wrote:
> maybe there was a little tube between tire and rim
> but how would that force the tire off the rim?
air pressure. Most of us have done a sloppy install and had this
happen. Last time it happened to me, I hit the deck as I thought it
was a gunshot.
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