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Main
Date: 16 Apr 2007 14:41:58
From: runcyclexcski@yahoo.com
Subject: why the hell did my tire blew up?
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I have those blue vertenstein forteza tires and tubes of some brand,
120 PSI (the tires say 170 limit). Ksyrium 2005 wheels (the nice
ones). Dura Ace break pads.
So I am going down a winding hill yesterday. I see slow traffic in
front of me, and I slow down. Now I got cars in front of me and cars
behind me. The traffic is going slow, so I squeeze the brakes every
now and then, but nothing unusual (the hill is 6% or so). After ~1 min
like this I hear a loud BANG, and my front tire comes off the rim.
This has never happenned to me before, and I've been always paranoid
about this happening. Since I was lucky going on a straight section
~20 mph I regained control and pulled over. A guy in a convertible
behind me freaked out more than I did.
I tested the rims, they were hot, but, again, nothing unusual.
The tube has split into 2 halves along the seam, a ~5 inch hole.
Anyway - WTF? What did I do wrong? And what do I have to do
differently to avoid being paranoid for the rest of my life? Use
different break pads? Change the wheels? The tires? The tubes? I
understand when a tire blows up when one hits a rock, or smth crasy
like that, but, damn, here I was just minding my own business and
quietly drafting behind a car.
A friend of mine had a vertenstein forteza blow up in the middle of
the night, waking the whole apartment complex up.
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Date: 19 Apr 2007 08:24:24
From: merlinnme@gmail.com
Subject: Re: why the hell did my tire blew up?
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On Apr 16, 2:41 pm, "runcyclexc...@yahoo.com"
<runcyclexc...@yahoo.com > wrote:
> I have those blue vertenstein forteza tires and tubes of some brand,
> 120 PSI (the tires say 170 limit). Ksyrium 2005 wheels (the nice
> ones). Dura Ace break pads.
>
> So I am going down a winding hill yesterday. I see slow traffic in
> front of me, and I slow down. Now I got cars in front of me and cars
> behind me. The traffic is going slow, so I squeeze the brakes every
> now and then, but nothing unusual (the hill is 6% or so). After ~1 min
> like this I hear a loud BANG, and my front tire comes off the rim.
> This has never happenned to me before, and I've been always paranoid
> about this happening. Since I was lucky going on a straight section
> ~20 mph I regained control and pulled over. A guy in a convertible
> behind me freaked out more than I did.
>
> I tested the rims, they were hot, but, again, nothing unusual.
> The tube has split into 2 halves along the seam, a ~5 inch hole.
>
> Anyway - WTF? What did I do wrong? And what do I have to do
> differently to avoid being paranoid for the rest of my life? Use
> different break pads? Change the wheels? The tires? The tubes? I
> understand when a tire blows up when one hits a rock, or smth crasy
> like that, but, damn, here I was just minding my own business and
> quietly drafting behind a car.
>
> A friend of mine had a vertenstein forteza blow up in the middle of
> the night, waking the whole apartment complex up.
You mentioned that the rims were warm, and that the tire seam opened
up opposite from the valve and that it was the side touching the rim.
Maybe heat from the rim weakened the seam. It may have occured
opposite the valve 'cause the rim would've been cooler nearest the
hole where the heat would've vented.
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Date: 17 Apr 2007 18:05:54
From: Sir Ridesalot
Subject: Re: why the hell did my tire blew up?
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On Apr 17, 7:50 pm, "runcyclexc...@yahoo.com"
<runcyclexc...@yahoo.com > wrote:
> Thank you for the bead suggestion. Yes, indeed, I installed that tube
> during my previous ride, when I had a crash, and had to replace it
> quckly.
>
> I never reallized that a tube can be caught so easily under the tire
> edge. I though the tube will automatically self-correct and slip from
> under the tire when I inflate the tube.
>
> Are there easy ways to check for that? Like, smth easy to miss by just
> looking?
Hi there.
This is where I like a bright colour rim tape. I put some air in the
tube, insert it into the tyre, pump it up a bit and then starting at
the valve I squeeze the tyre together and look at the inside of the
rim to be certain the tyre is not sitting on the tube any where. The
yellow rim tape on my rims makes seeing this very easy. I check both
sides of the tyre. If the tyre is on the tube I massage the tyre back
and forth (side to side) until the tube pops into its proper position.
I hope this helps.
Cheers from Peter
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Date: 17 Apr 2007 16:51:30
From: runcyclexcski@yahoo.com
Subject: Re: why the hell did my tire blew up?
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70 degress? Hot by Marin county standards, I guess.
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Date: 17 Apr 2007 16:50:44
From: runcyclexcski@yahoo.com
Subject: Re: why the hell did my tire blew up?
|
Thank you for the bead suggestion. Yes, indeed, I installed that tube
during my previous ride, when I had a crash, and had to replace it
quckly.
I never reallized that a tube can be caught so easily under the tire
edge. I though the tube will automatically self-correct and slip from
under the tire when I inflate the tube.
Are there easy ways to check for that? Like, smth easy to miss by just
looking?
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Date: 18 Apr 2007 01:38:28
From: Mike Jacoubowsky
Subject: Re: why the hell did my tire blew up?
|
> Thank you for the bead suggestion. Yes, indeed, I installed that tube
> during my previous ride, when I had a crash, and had to replace it
> quckly.
>
> I never reallized that a tube can be caught so easily under the tire
> edge. I though the tube will automatically self-correct and slip from
> under the tire when I inflate the tube.
>
> Are there easy ways to check for that? Like, smth easy to miss by just
> looking?
Best way to prevent a pinch is to install the tube initially with enough air
in it that it takes shape. That prevents it from squeezing into nooks &
crannies.
--Mike Jacoubowsky
Chain Reaction Bicycles
www.ChainReaction.com
Redwood City & Los Altos, CA USA
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Date: 18 Apr 2007 05:47:21
From: Mark Hickey
Subject: Re: why the hell did my tire blew up?
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"Mike Jacoubowsky" <MikeJ@ChainReaction.com > wrote:
>> Thank you for the bead suggestion. Yes, indeed, I installed that tube
>> during my previous ride, when I had a crash, and had to replace it
>> quckly.
>>
>> I never reallized that a tube can be caught so easily under the tire
>> edge. I though the tube will automatically self-correct and slip from
>> under the tire when I inflate the tube.
>>
>> Are there easy ways to check for that? Like, smth easy to miss by just
>> looking?
>
>Best way to prevent a pinch is to install the tube initially with enough air
>in it that it takes shape. That prevents it from squeezing into nooks &
>crannies.
Another method I use to prevent pinch flats (especially on tire/wheel
combinations that are very tight and hard to mount)... I carefully
slide on 3/4ths of the bead the "normal way", leaving the exposed
portion near the valve stem (which I've pushed up into the tire to
make sure that the tube isn't pinched there). Then I start at the
unmounted portion nearest the valve stem, and push it over the rim. I
don't try to constrain the OTHER "front" side of the exposed portion
of the bead, so it "pushes out of the rim" as I insert the bead on the
other "back" end of the exposed portion of the bead.
Since the tube is already properly placed in the portion of the rim
that has had the bead fully installed, once the "back side" of the
exposed portion of the bead passes the point where the bead WAS inside
the rim before you started "chasing it around the rim", you can
constrain the "front side" of the bead from popping out and continue
inserting the "back side" of the bead until you've got it done.
Hope that makes some sort of verbal sense - do it once and you will
say "ahhhhhh, I get it", and will never have a problem with a pinched
bead again. I should add that even though I do this when changing
tires, I still do a "bead check", and push the tire in and visually
verify that there's no tube exposed anywhere. A very cheap and easy
"insurance" policy.
Mark Hickey
Habanero Cycles
http://www.habcycles.com
Home of the $795 ti frame
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Date: 18 Apr 2007 09:08:32
From: Bill Sornson
Subject: Re: why the hell did my tire blew up?
|
Mark Hickey wrote:
> "Mike Jacoubowsky" <MikeJ@ChainReaction.com> wrote:
>
>>> Thank you for the bead suggestion. Yes, indeed, I installed that
>>> tube during my previous ride, when I had a crash, and had to
>>> replace it quckly.
>>>
>>> I never reallized that a tube can be caught so easily under the tire
>>> edge. I though the tube will automatically self-correct and slip
>>> from under the tire when I inflate the tube.
>>>
>>> Are there easy ways to check for that? Like, smth easy to miss by
>>> just looking?
>>
>> Best way to prevent a pinch is to install the tube initially with
>> enough air in it that it takes shape. That prevents it from
>> squeezing into nooks & crannies.
>
> Another method I use to prevent pinch flats (especially on tire/wheel
> combinations that are very tight and hard to mount)... I carefully
> slide on 3/4ths of the bead the "normal way", leaving the exposed
> portion near the valve stem (which I've pushed up into the tire to
> make sure that the tube isn't pinched there). Then I start at the
> unmounted portion nearest the valve stem, and push it over the rim. I
> don't try to constrain the OTHER "front" side of the exposed portion
> of the bead, so it "pushes out of the rim" as I insert the bead on the
> other "back" end of the exposed portion of the bead.
>
> Since the tube is already properly placed in the portion of the rim
> that has had the bead fully installed, once the "back side" of the
> exposed portion of the bead passes the point where the bead WAS inside
> the rim before you started "chasing it around the rim", you can
> constrain the "front side" of the bead from popping out and continue
> inserting the "back side" of the bead until you've got it done.
Well that sure made your TdF/Floyd comment seem clear as air in comparison!
LOL
> Hope that makes some sort of verbal sense - do it once and you will
> say "ahhhhhh, I get it", and will never have a problem with a pinched
> bead again. I should add that even though I do this when changing
> tires, I still do a "bead check", and push the tire in and visually
> verify that there's no tube exposed anywhere. A very cheap and easy
> "insurance" policy.
No one could read it and not conclude that it wasn't complicatedly perfectly
correct.
Probably.
BS (not even sure!)
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Date: 17 Apr 2007 17:54:36
From: Bill Sornson
Subject: Re: why the hell did my tire blew up?
|
runcyclexcski@yahoo.com wrote:
> Thank you for the bead suggestion. Yes, indeed, I installed that tube
> during my previous ride, when I had a crash, and had to replace it
> quckly.
>
> I never reallized that a tube can be caught so easily under the tire
> edge. I though the tube will automatically self-correct and slip from
> under the tire when I inflate the tube.
>
> Are there easy ways to check for that? Like, smth easy to miss by just
> looking?
Put 30-40 psi in the tire and "massage" the tire all around to make sure no
tube pinch AND the bead is evenly engaged. Then continue inflating it.
Of course, I thought I'd done that, too, and...
Kablooey
Bill "ringing ears" S.
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Date: 18 Apr 2007 15:50:32
From: Roberto Divia
Subject: Re: why the hell did my tire blew up?
|
Bill Sornson wrote:
> runcyclexcski@yahoo.com wrote:
[...]
>> Are there easy ways to check for that? Like, smth easy to miss by just
>> looking?
>
> Put 30-40 psi in the tire and "massage" the tire all around to make sure no
> tube pinch AND the bead is evenly engaged. Then continue inflating it.
This is exactly what I do. Give a bit of air and then massage the tire
left-right to check that nothing got pinched between tire and rim.
Ciao,
--
Roberto Divia` Love at first sight is one of the greatest
Dep:PH Bat:53 Mailbox:C02110 labour-saving devices the world has ever seen
Route de Meyrin 385 ---------------------------------------------
Case Postale Phone: +41-22-767-4994
CH-1211 Geneve 23 CERN Fax: +41-22-767-9585
Switzerland E-Mail: Roberto.Divia@cern.ch
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Date: 17 Apr 2007 17:53:01
From: nash
Subject: Re: why the hell did my tire blew up?
|
> A friend of mine had a vertenstein forteza blow up in the middle of
> the night, waking the whole apartment complex up.
>
<<<<<<<<<<<<<<<<
Interesting, and you do not think you should buy a different tire,
interesting lol
was it a hot day also on the downhill. Could be the tire pressure just
soared.
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Date: 17 Apr 2007 09:53:16
From: gds
Subject: Re: why the hell did my tire blew up?
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On Apr 16, 3:02 pm, "Ghamph" <gha...@localnet.com > wrote:
>>
> Remind me not to buy any Vertenstein Forteza tires and tubes.
>
The Vredstein Fortezza's are great tires. They are my training tire of
choice. I get ~ 1500 miles per rear and double that for fronts. I have
never had what was described happen. My experience with these now run
~15,000 miles.
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Date: 17 Apr 2007 00:47:12
From: runcyclexcski@yahoo.com
Subject: Re: why the hell did my tire blew up?
|
My bad, I located the tube. It's almost opposite from the valve, and
the seam that failed was in contact with the side of the rim (assuming
that the tube was not twisted or anything). The tire looks fine
overall.
I will be in Redowood city this weekend, I can stop buy and show the
tire and tube to you if you don't mind.
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Date: 18 Apr 2007 01:36:57
From: Mike Jacoubowsky
Subject: Re: why the hell did my tire blew up?
|
> My bad, I located the tube. It's almost opposite from the valve, and
> the seam that failed was in contact with the side of the rim (assuming
> that the tube was not twisted or anything). The tire looks fine
> overall.
>
> I will be in Redowood city this weekend, I can stop buy and show the
> tire and tube to you if you don't mind.
I'll be happy to look, but keep in mind it could be a bit of a wait on a
Saturday. Particularly between 2-6pm, when it can seem like it's
standing-room-only. Not quite that bad really, but feels that way to those
working!
But overall it sounds like a tube pinch.
--Mike Jacoubowsky
Chain Reaction Bicycles
www.ChainReaction.com
Redwood City & Los Altos, CA USA
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Date: 18 Apr 2007 05:48:35
From: Mark Hickey
Subject: Re: why the hell did my tire blew up?
|
"Mike Jacoubowsky" <MikeJ@ChainReaction.com > wrote:
>> My bad, I located the tube. It's almost opposite from the valve, and
>> the seam that failed was in contact with the side of the rim (assuming
>> that the tube was not twisted or anything). The tire looks fine
>> overall.
>>
>> I will be in Redowood city this weekend, I can stop buy and show the
>> tire and tube to you if you don't mind.
>
>I'll be happy to look, but keep in mind it could be a bit of a wait on a
>Saturday. Particularly between 2-6pm, when it can seem like it's
>standing-room-only. Not quite that bad really, but feels that way to those
>working!
>
>But overall it sounds like a tube pinch.
If there was a loud bang when the tube went, there's no doubt at all
it was a tube pinch. Even if the tube fails dramatically inside the
tire, the noise would be very muffled by being enclosed.
Mark Hickey
Habanero Cycles
http://www.habcycles.com
Home of the $795 ti frame
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Date: 17 Apr 2007 08:17:41
From: Bill Sornson
Subject: Re: why the hell did my tire blew up?
|
runcyclexcski@yahoo.com wrote:
> My bad, I located the tube. It's almost opposite from the valve, and
> the seam that failed was in contact with the side of the rim (assuming
> that the tube was not twisted or anything). The tire looks fine
> overall.
>
> I will be in Redowood city this weekend, I can stop buy and show the
> tire and tube to you if you don't mind.
Having just exploded a tube yesterday installing new (700-20s! -- all they
had but what was I thinking) Open Corsa CXs, my money is on the tube being
pinched between the tire bead and rim edge. I tried to be careful...but
BOOM!
Had you recently installed or reinflated the tube? Even if not, maybe the
bead was /just barely/ hooked, and when it slipped off, ka-powie (tech term
alert)...
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Date: 17 Apr 2007 09:11:04
From: Dane Buson
Subject: Re: why the hell did my tire blew up?
|
Bill Sornson <askme@ask.me > wrote:
> runcyclexcski@yahoo.com wrote:
>> My bad, I located the tube. It's almost opposite from the valve, and
>> the seam that failed was in contact with the side of the rim (assuming
>> that the tube was not twisted or anything). The tire looks fine
>> overall.
>>
>> I will be in Redowood city this weekend, I can stop buy and show the
>> tire and tube to you if you don't mind.
>
> Having just exploded a tube yesterday installing new (700-20s! -- all they
> had but what was I thinking) Open Corsa CXs, my money is on the tube being
> pinched between the tire bead and rim edge. I tried to be careful...but
> BOOM!
>
> Had you recently installed or reinflated the tube? Even if not, maybe the
> bead was /just barely/ hooked, and when it slipped off, ka-powie (tech term
> alert)...
I was inflating a tire for my wife for her MTB. I had brought it up to
5 under the rating on the sidewall. I was walking it over to her bike,
and gave it gentle bounce off the floor. BANG! A tear right through
the sidewall. It was definitely not a pinched/hooked bead.
It was some crappy Performance house brand tire. I returned them and
replaced them with a pair of Ritchey something or others.
--
Dane Buson - sigdane@unixbigots.org
Temporal Anomalies don't kill people... they were just never born
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Date: 17 Apr 2007 09:20:24
From: Bill Sornson
Subject: Re: why the hell did my tire blew up?
|
Dane Buson wrote:
> Bill Sornson <askme@ask.me> wrote:
>> runcyclexcski@yahoo.com wrote:
>>> My bad, I located the tube. It's almost opposite from the valve, and
>>> the seam that failed was in contact with the side of the rim
>>> (assuming that the tube was not twisted or anything). The tire
>>> looks fine overall.
>>>
>>> I will be in Redowood city this weekend, I can stop buy and show the
>>> tire and tube to you if you don't mind.
>>
>> Having just exploded a tube yesterday installing new (700-20s! --
>> all they had but what was I thinking) Open Corsa CXs, my money is on
>> the tube being pinched between the tire bead and rim edge. I tried
>> to be careful...but BOOM!
>>
>> Had you recently installed or reinflated the tube? Even if not,
>> maybe the bead was /just barely/ hooked, and when it slipped off,
>> ka-powie (tech term alert)...
>
> I was inflating a tire for my wife for her MTB. I had brought it up
> to 5 under the rating on the sidewall. I was walking it over to her
> bike, and gave it gentle bounce off the floor. BANG! A tear right
> through the sidewall. It was definitely not a pinched/hooked bead.
>
> It was some crappy Performance house brand tire. I returned them and
> replaced them with a pair of Ritchey something or others.
Right...but this guy's tire appears to be undamaged and/or defective IIRC.
So I'm guessing it was bead slip (more tech jargon).
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Date: 16 Apr 2007 23:14:13
From: runcyclexcski@yahoo.com
Subject: Re: why the hell did my tire blew up?
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did not notice anything unusual. Not that I was paying attention. And
I do not remember where the split was; the tire is already at a
landfill somwhere.
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Date: 16 Apr 2007 23:44:52
From: Mike Jacoubowsky
Subject: Re: why the hell did my tire blew up?
|
> did not notice anything unusual. Not that I was paying attention. And
> I do not remember where the split was; the tire is already at a
> landfill somwhere.
Right, but I'm talking about the tube, not the tire. Of course, if you
tossed the tire, chances aren't too high that you kept the tube! But anytime
something like that happens, keep both tire & tube and bring them back to
the shop you got them from. There are often clues, especially on the tube,
that might give an idea of what caused the failure.
--Mike-- Chain Reaction Bicycles
www.ChainReactionBicycles.com
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Date: 18 Apr 2007 18:51:38
From:
Subject: Re: why the hell did my tire blew up?
|
On Apr 18, 9:36 pm, Mark Hickey <m...@habcycles.com > wrote:
> frkry...@gmail.com wrote:
> >On Apr 18, 8:47 am, Mark Hickey <m...@habcycles.com> wrote:
>
> >> Another method I use to prevent pinch flats (especially on tire/wheel
> >> combinations that are very tight and hard to mount)... I carefully
> >> slide on 3/4ths of the bead the "normal way", leaving the exposed
> >> portion near the valve stem (which I've pushed up into the tire to
> >> make sure that the tube isn't pinched there). Then I start at the
> >> unmounted portion nearest the valve stem, and push it over the rim. I
> >> don't try to constrain the OTHER "front" side of the exposed portion
> >> of the bead, so it "pushes out of the rim" as I insert the bead on the
> >> other "back" end of the exposed portion of the bead.
>
> >> Since the tube is already properly placed in the portion of the rim
> >> that has had the bead fully installed, once the "back side" of the
> >> exposed portion of the bead passes the point where the bead WAS inside
> >> the rim before you started "chasing it around the rim", you can
> >> constrain the "front side" of the bead from popping out and continue
> >> inserting the "back side" of the bead until you've got it done.
>
> >> Hope that makes some sort of verbal sense...
>
> >Hmm. I couldn't follow it at all. And unlike my post last night, I'm
> >now wide awake and libation-free.
>
> >Care to try again, perhaps doing it in terms of a clock face? Let's
> >say for a rear wheel, cog side down against the ground, stem at the 12
> >o'clock position?
>
> Heh,... OK, OK... it wasn't the best piece of prose that ever left
> this keyboard.
>
> Let me try putting it as a numbered sequence...
>
> 1) Install one side of the tire's bead into the rim
> 2) Lightly inflate the tube enough to give it shape, and to fill at
> least 1/2 the volume of the tire. Insert the tube into the tire, and
> push the stem up into the rim a bit to make sure that you don't pinch
> the tube near that point.
> 3) Roll on the other side of the tire's bead until you have about 8"
> (.25m) of un-inserted bead, with one end of the uninserted bead near
> the valve stem.
> 4) Start inserting the bead of this uninserted portion at the end near
> the valve stem with your thumbs, but do not try to constrain the other
> end of the uninserted bead in any way. Notice that the OTHER end of
> the uninserted bead moves away from the end you're working on,
> effectively moving the unmounted portion of the bead around the rim.
> 5) Since the tube is fully inside the tire everywhere but the 8"
> nearest the portion of the tire you started working on, by the time
> you've moved the "uninserted bit" 10" or 12" around the rim, there's
> virtually no chance that you'll pinch the tube when you now push both
> ends of the uninserted bead into the rim (since that portion of the
> tube was where it belonged when you originally pushed that portion of
> the tire onto the rim before you started on #4 above.
>
> 'Zat any better?
WAY better. And it sounds like it would work! Thanks.
- Frank Krygowski
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Date: 17 Apr 2007 01:31:21
From: Mike Jacoubowsky
Subject: Re: why the hell did my tire blew up?
|
>I have those blue vertenstein forteza tires and tubes of some brand,
> 120 PSI (the tires say 170 limit). Ksyrium 2005 wheels (the nice
> ones). Dura Ace break pads.
>
> So I am going down a winding hill yesterday. I see slow traffic in
> front of me, and I slow down. Now I got cars in front of me and cars
> behind me. The traffic is going slow, so I squeeze the brakes every
> now and then, but nothing unusual (the hill is 6% or so). After ~1 min
> like this I hear a loud BANG, and my front tire comes off the rim.
> This has never happenned to me before, and I've been always paranoid
> about this happening. Since I was lucky going on a straight section
> ~20 mph I regained control and pulled over. A guy in a convertible
> behind me freaked out more than I did.
>
> I tested the rims, they were hot, but, again, nothing unusual.
> The tube has split into 2 halves along the seam, a ~5 inch hole.
>
> Anyway - WTF? What did I do wrong? And what do I have to do
> differently to avoid being paranoid for the rest of my life? Use
> different break pads? Change the wheels? The tires? The tubes? I
> understand when a tire blows up when one hits a rock, or smth crasy
> like that, but, damn, here I was just minding my own business and
> quietly drafting behind a car.
>
> A friend of mine had a vertenstein forteza blow up in the middle of
> the night, waking the whole apartment complex up.
How far from the valve hole is the split in the tube?
Did you notice any thumping prior to the bang?
--Mike--
Chain Reaction Bicycles
www.ChainReaction.com
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Date: 18 Apr 2007 11:10:19
From:
Subject: Re: why the hell did my tire blew up?
|
On Apr 18, 8:47 am, Mark Hickey <m...@habcycles.com > wrote:
>
> Another method I use to prevent pinch flats (especially on tire/wheel
> combinations that are very tight and hard to mount)... I carefully
> slide on 3/4ths of the bead the "normal way", leaving the exposed
> portion near the valve stem (which I've pushed up into the tire to
> make sure that the tube isn't pinched there). Then I start at the
> unmounted portion nearest the valve stem, and push it over the rim. I
> don't try to constrain the OTHER "front" side of the exposed portion
> of the bead, so it "pushes out of the rim" as I insert the bead on the
> other "back" end of the exposed portion of the bead.
>
> Since the tube is already properly placed in the portion of the rim
> that has had the bead fully installed, once the "back side" of the
> exposed portion of the bead passes the point where the bead WAS inside
> the rim before you started "chasing it around the rim", you can
> constrain the "front side" of the bead from popping out and continue
> inserting the "back side" of the bead until you've got it done.
>
> Hope that makes some sort of verbal sense...
Hmm. I couldn't follow it at all. And unlike my post last night, I'm
now wide awake and libation-free.
Care to try again, perhaps doing it in terms of a clock face? Let's
say for a rear wheel, cog side down against the ground, stem at the 12
o'clock position?
- Frank Krygowski
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Date: 18 Apr 2007 18:36:32
From: Mark Hickey
Subject: Re: why the hell did my tire blew up?
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frkrygow@gmail.com wrote:
>On Apr 18, 8:47 am, Mark Hickey <m...@habcycles.com> wrote:
>>
>> Another method I use to prevent pinch flats (especially on tire/wheel
>> combinations that are very tight and hard to mount)... I carefully
>> slide on 3/4ths of the bead the "normal way", leaving the exposed
>> portion near the valve stem (which I've pushed up into the tire to
>> make sure that the tube isn't pinched there). Then I start at the
>> unmounted portion nearest the valve stem, and push it over the rim. I
>> don't try to constrain the OTHER "front" side of the exposed portion
>> of the bead, so it "pushes out of the rim" as I insert the bead on the
>> other "back" end of the exposed portion of the bead.
>>
>> Since the tube is already properly placed in the portion of the rim
>> that has had the bead fully installed, once the "back side" of the
>> exposed portion of the bead passes the point where the bead WAS inside
>> the rim before you started "chasing it around the rim", you can
>> constrain the "front side" of the bead from popping out and continue
>> inserting the "back side" of the bead until you've got it done.
>>
>> Hope that makes some sort of verbal sense...
>
>Hmm. I couldn't follow it at all. And unlike my post last night, I'm
>now wide awake and libation-free.
>
>Care to try again, perhaps doing it in terms of a clock face? Let's
>say for a rear wheel, cog side down against the ground, stem at the 12
>o'clock position?
Heh,... OK, OK... it wasn't the best piece of prose that ever left
this keyboard.
Let me try putting it as a numbered sequence...
1) Install one side of the tire's bead into the rim
2) Lightly inflate the tube enough to give it shape, and to fill at
least 1/2 the volume of the tire. Insert the tube into the tire, and
push the stem up into the rim a bit to make sure that you don't pinch
the tube near that point.
3) Roll on the other side of the tire's bead until you have about 8"
(.25m) of un-inserted bead, with one end of the uninserted bead near
the valve stem.
4) Start inserting the bead of this uninserted portion at the end near
the valve stem with your thumbs, but do not try to constrain the other
end of the uninserted bead in any way. Notice that the OTHER end of
the uninserted bead moves away from the end you're working on,
effectively moving the unmounted portion of the bead around the rim.
5) Since the tube is fully inside the tire everywhere but the 8"
nearest the portion of the tire you started working on, by the time
you've moved the "uninserted bit" 10" or 12" around the rim, there's
virtually no chance that you'll pinch the tube when you now push both
ends of the uninserted bead into the rim (since that portion of the
tube was where it belonged when you originally pushed that portion of
the tire onto the rim before you started on #4 above.
'Zat any better?
Mark Hickey
Habanero Cycles
http://www.habcycles.com
Home of the $795 ti frame
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Date: 16 Apr 2007 18:02:04
From: Ghamph
Subject: Re: why the hell did my tire blew up?
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<runcyclexcski@yahoo.com > wrote in message
news:1176759718.193009.37350@y5g2000hsa.googlegroups.com...
> I have those blue vertenstein forteza tires and tubes of some brand,
> 120 PSI (the tires say 170 limit). Ksyrium 2005 wheels (the nice
> ones). Dura Ace break pads.
>
After ~1 min
> like this I hear a loud BANG, and my front tire comes off the rim.
Remind me not to buy any Vertenstein Forteza tires and tubes.
I have sccr 27x1 1/4 fifteen years old same tires and tubes only put 80 lbs
air (they are getting a little cracked).
I think I'll buy another set of cheap tires like I have , cause they are
almost out of tread.
Jamffer
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