Tire - thump, thump, thump-BLAM!

Quoted message said:

bentcruiser" <[email hidden]> wrote in message

"]news:[email hidden]...

Quoted message said:

I had not yet put on my favorite touring tires (Schwalbe Marathons) on my Canto until yesterday.
My current tubes did not fit the tires so I had to get some that did.

I rode approximately 100 feet on the tires and the rear tire went thump, thump, thump BLAM!

You should be using a larger tube, but that is not what caused the blowout. Your blowout was a
classic case of the tire not being seated evenly around the rim, or the tube was pinched between the
tire and the rim. One part of the tire bead started to protrude over the rim, allowing the tube to
bulge out (hence the thumping of the tire or tube hitting the brake shoe). Once this occurs it is
only seconds until the bulging part of the tube EXPLODES. The one time this happened to me people
came out of their houses to see if someone was shooting.

Not all tires and rims of the "correct" size mate properly. Some tire and rim combinations are of
such a loose fit that "blowouts" are more likely to happen. I once had to buy a different brand of
rim to properly match the tire I wanted to use. The manufacturing tolerances for rims and tires are
apparently pretty loose.

Len

I have found you can experience this problem (as described below) even with properly rims and tires
if you don't mount them correctly.

My procedure is as follws:

Be sure the rim tape is clean and there are no protruding or uncovered spoke nipples. Repair or
replace as necessary.

Unfold new tube or place old tube inside tire, slightly inflate to push it into place, then deflate
somewhat. Leave tube in tire.

Line use valve stem with hole in rim. Partially insert stem and then place 1 bread on tire/tube
combo over 1 side of rim . Be sure that tire is deflated enough, work other bead over rim with
fingers. This can be done if you make sure the bread is pushed toward the center of the rim channel
all the way around as it is being installed. I haven't used a "tire iron" for assembly in years.

Check carefully for a trapped inner tube by squeezing the beads of the tire toward the center and
looking for a tube curled under both tire beads. If installed properly, the tube should not be
visible when the tire side are squeezed towards the center. If found, fix it.

Once the tire is installed, inflate to 20 lbs, then deflate to "set" the tube in the tire.

Look for a fine line molded into the tire just above the rim bead. Assuming its a road tire, inflate
to about 30 lbs, and look carefully at both sides - the fine line should be evenly spaced away from
the rim all the way around. If not, deflate tire, and try to recenter ther tire by pulling on
"short" side (where line disappears behind rim). Note that sidewall coloration or tread edge lines
may not be symetrical - always use molded in rim lines on tire to judge centering.

Inflate to working pressure. Check centering line again. Deflate and rework as necessary.

I have had good fitting tires pop off the rim when inflated for the first time if they were not
mounted reasonably well centered. After replacing the tube, these same tires (properly mounted) have
given good service.

"Lennert Thunberg" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Quoted message said:

bentcruiser" <[email hidden]> wrote in message

"]news:[email hidden]...

Quoted message said:

I had not yet put on my favorite touring tires (Schwalbe Marathons) on my Canto until yesterday.
My current tubes did not fit the tires so I had to get some that did.

I rode approximately 100 feet on the tires and the rear tire went thump, thump, thump BLAM!

You should be using a larger tube, but that is not what caused the

blowout.

Quoted message said:

Your blowout was a classic case of the tire not being seated evenly around the rim, or the tube
was pinched between the tire and the rim. One part

of

Quoted message said:

the tire bead started to protrude over the rim, allowing the tube to bulge out (hence the thumping
of the tire or tube hitting the brake shoe). Once this occurs it is only seconds until the bulging
part of the tube

EXPLODES.

Quoted message said:

The one time this happened to me people came out of their houses to see if someone was shooting.

Not all tires and rims of the "correct" size mate properly. Some tire and rim combinations are of
such a loose fit that "blowouts" are more likely

to

Quoted message said:

happen. I once had to buy a different brand of rim to properly match the tire I wanted to use. The
manufacturing tolerances for rims and tires are apparently pretty loose.

Len

Hi Pieter, You describe a good procedure below. I have found that having talcum powder on tube and
inside of wheel rims helps with seating and getting tire on rim. Also using full gloves (not biking
gloves with exposed fingers) or a rag or a handkerchief helps fingering tire onto rim, since a
better grip on tire is provided. A Zipp Stick works better for me than plastic or metal tire irons,
since irons tend to pinch tube especially if used to put tire on. But flat fixing on the road is
still time consuming and aggravating.
--
~~~al.kubeluis..md.usa.earth.sun.milkyway.virgo.universe..corsa~~~

"Pieter Litchfield" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

I have found you can experience this problem (as described below) even

with

Quoted message said:

properly rims and tires if you don't mount them correctly.

My procedure is as follws:

Be sure the rim tape is clean and there are no protruding or uncovered

spoke

Quoted message said:

nipples. Repair or replace as necessary.

Unfold new tube or place old tube inside tire, slightly inflate to push it into place, then
deflate somewhat. Leave tube in tire.

Line use valve stem with hole in rim. Partially insert stem and then place

1

Quoted message said:

bread on tire/tube combo over 1 side of rim . Be sure that tire is

deflated

Quoted message said:

enough, work other bead over rim with fingers. This can be done if you

make

Quoted message said:

sure the bread is pushed toward the center of the rim channel all the way around as it is being
installed. I haven't used a "tire iron" for

assembly

Quoted message said:

in years.

Check carefully for a trapped inner tube by squeezing the beads of the

tire

Quoted message said:

toward the center and looking for a tube curled under both tire beads. If installed properly, the
tube should not be visible when the tire side are squeezed towards the center. If found, fix it.

Once the tire is installed, inflate to 20 lbs, then deflate to "set" the tube in the tire.

Look for a fine line molded into the tire just above the rim bead.

Assuming

Quoted message said:

its a road tire, inflate to about 30 lbs, and look carefully at both

sides -

Quoted message said:

the fine line should be evenly spaced away from the rim all the way

around.

Quoted message said:

If not, deflate tire, and try to recenter ther tire by pulling on "short" side (where line
disappears behind rim). Note that sidewall coloration or tread edge lines may not be symetrical -
always use molded in rim lines on tire to judge centering.

Inflate to working pressure. Check centering line again. Deflate and rework as necessary.

I have had good fitting tires pop off the rim when inflated for the first time if they were not
mounted reasonably well centered. After replacing

the

Quoted message said:

tube, these same tires (properly mounted) have given good service.

"Lennert Thunberg" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Quoted message said:

bentcruiser" <[email hidden]> wrote in message

"]news:[email hidden]...

Quoted message said:

I had not yet put on my favorite touring tires (Schwalbe Marathons) on my Canto until
yesterday. My current tubes did not fit the tires so I had to get some that did.

I rode approximately 100 feet on the tires and the rear tire went

thump,

Quoted message said:

Quoted message said:

Quoted message said:

thump, thump BLAM!

You should be using a larger tube, but that is not what caused the

blowout.

Quoted message said:

Your blowout was a classic case of the tire not being seated evenly

around

Quoted message said:

Quoted message said:

the rim, or the tube was pinched between the tire and the rim. One part

of

Quoted message said:

the tire bead started to protrude over the rim, allowing the tube to

bulge

Quoted message said:

Quoted message said:

out (hence the thumping of the tire or tube hitting the brake shoe).

Once

Quoted message said:

Quoted message said:

this occurs it is only seconds until the bulging part of the tube

EXPLODES.

Quoted message said:

The one time this happened to me people came out of their houses to see

if

Quoted message said:

Quoted message said:

someone was shooting.

Not all tires and rims of the "correct" size mate properly. Some tire

and

Quoted message said:

Quoted message said:

rim combinations are of such a loose fit that "blowouts" are more

likely

Quoted message said:

to

Quoted message said:

happen. I once had to buy a different brand of rim to properly match

the

Quoted message said:

Quoted message said:

tire I wanted to use. The manufacturing tolerances for rims and tires

are

Quoted message said:

Quoted message said:

apparently pretty loose.

Len

That is usually what I do. The funnier part to this story that I left out of the first post was that the bike shop put it on. I find that to be strange. With my two hands, I generally do not have a problem seating the tire on the rim. I suppose I will get a 1.35" width tire and redo the tire myself.

Derek

Quoted post said:

Originally posted by Lennert Thunber
You should be using a larger tube, but that is not what caused the blowout. Your blowout was a
classic case of the tire not being seated evenly around the rim, or the tube was pinched between the
tire and the rim. One part of the tire bead started to protrude over the rim, allowing the tube to
bulge out (hence the thumping of the tire or tube hitting the brake shoe). Once this occurs it is
only seconds until the bulging part of the tube EXPLODES. The one time this happened to me people
came out of their houses to see if someone was shooting.

Not all tires and rims of the "correct" size mate properly. Some tire and rim combinations are of
such a loose fit that "blowouts" are more likely to happen. I once had to buy a different brand of
rim to properly match the tire I wanted to use. The manufacturing tolerances for rims and tires are
apparently pretty loose.

Len [/B]

Yes; Peter good discription. One thing I do is inflate the tire to about 15 pounds of air then stand
it on the ground, put my some of my weight on it and roll it a couple of times, this seems to help
hook the bead into the rim. then follow your directions. Being careful is key though. I've screwed
up enough tubes to know enough to take my time :-) Denny in Sayre, Pa "Bent but not broken"
www.recumbentstuff.com

"Al Kubeluis" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Hi Pieter, You describe a good procedure below. I have found that having talcum powder on tube and
inside of wheel

rims

Quoted message said:

helps with seating and getting tire on rim. Also using full gloves

(not

Quoted message said:

biking gloves with exposed fingers) or a rag or a handkerchief helps fingering tire onto rim,
since a better grip on tire is provided. A Zipp Stick works better for me than plastic or metal
tire irons,

since

Quoted message said:

irons tend to pinch tube especially if used to put tire on. But flat fixing on the road is still
time consuming and aggravating.
--
~~~al.kubeluis..md.usa.earth.sun.milkyway.virgo.universe..corsa~~~

"Pieter Litchfield" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

I have found you can experience this problem (as described below) even

with

Quoted message said:

properly rims and tires if you don't mount them correctly.

My procedure is as follws:

Be sure the rim tape is clean and there are no protruding or uncovered

spoke

Quoted message said:

nipples. Repair or replace as necessary.

Unfold new tube or place old tube inside tire, slightly inflate to push

it

Quoted message said:

Quoted message said:

into place, then deflate somewhat. Leave tube in tire.

Line use valve stem with hole in rim. Partially insert stem and then

place

Quoted message said:

1

Quoted message said:

bread on tire/tube combo over 1 side of rim . Be sure that tire is

deflated

Quoted message said:

enough, work other bead over rim with fingers. This can be done if you

make

Quoted message said:

sure the bread is pushed toward the center of the rim channel all the

way

Quoted message said:

Quoted message said:

around as it is being installed. I haven't used a "tire iron" for

assembly

Quoted message said:

in years.

Check carefully for a trapped inner tube by squeezing the beads of the

tire

Quoted message said:

toward the center and looking for a tube curled under both tire beads.

If

Quoted message said:

Quoted message said:

installed properly, the tube should not be visible when the tire side

are

Quoted message said:

Quoted message said:

squeezed towards the center. If found, fix it.

Once the tire is installed, inflate to 20 lbs, then deflate to "set" the tube in the tire.

Look for a fine line molded into the tire just above the rim bead.

Assuming

Quoted message said:

its a road tire, inflate to about 30 lbs, and look carefully at both

sides -

Quoted message said:

the fine line should be evenly spaced away from the rim all the way

around.

Quoted message said:

If not, deflate tire, and try to recenter ther tire by pulling on

"short"

Quoted message said:

Quoted message said:

side (where line disappears behind rim). Note that sidewall coloration

or

Quoted message said:

Quoted message said:

tread edge lines may not be symetrical - always use molded in rim lines

on

Quoted message said:

Quoted message said:

tire to judge centering.

Inflate to working pressure. Check centering line again. Deflate and rework as necessary.

I have had good fitting tires pop off the rim when inflated for the

first

Quoted message said:

Quoted message said:

time if they were not mounted reasonably well centered. After replacing

the

Quoted message said:

tube, these same tires (properly mounted) have given good service.

"Lennert Thunberg" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

>bentcruiser" <[email hidden]> wrote in message
"]news:[email hidden]...
> I had not yet put on my favorite touring tires (Schwalbe Marathons)

on

Quoted message said:

Quoted message said:

Quoted message said:

> my Canto until yesterday. My current tubes did not fit the tires so

I

Quoted message said:

Quoted message said:

Quoted message said:

> had to get some that did.
>
> I rode approximately 100 feet on the tires and the rear tire went

thump,

Quoted message said:

Quoted message said:

> thump, thump BLAM!

You should be using a larger tube, but that is not what caused the

blowout.

Quoted message said:

Your blowout was a classic case of the tire not being seated evenly

around

Quoted message said:

Quoted message said:

the rim, or the tube was pinched between the tire and the rim. One

part

Quoted message said:

Quoted message said:

of

Quoted message said:

the tire bead started to protrude over the rim, allowing the tube to

bulge

Quoted message said:

Quoted message said:

out (hence the thumping of the tire or tube hitting the brake shoe).

Once

Quoted message said:

Quoted message said:

this occurs it is only seconds until the bulging part of the tube

EXPLODES.

Quoted message said:

The one time this happened to me people came out of their houses to

see

Quoted message said:

if

Quoted message said:

Quoted message said:

someone was shooting.

Not all tires and rims of the "correct" size mate properly. Some tire

and

Quoted message said:

Quoted message said:

rim combinations are of such a loose fit that "blowouts" are more

likely

Quoted message said:

to

Quoted message said:

happen. I once had to buy a different brand of rim to properly match

the

Quoted message said:

Quoted message said:

tire I wanted to use. The manufacturing tolerances for rims and tires

are

Quoted message said:

Quoted message said:

apparently pretty loose.

Len

Denny - you're quite right. I forgot in my suggestions to add that after inflating to 20 lbs or
so, I bounce the assembled wheel & tire on the ground while rotating a few times to set the
bead as well.

"Denny Voorhees" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Yes; Peter good discription. One thing I do is inflate the tire to about

15

Quoted message said:

pounds of air then stand it on the ground, put my some of my weight on it and roll it a couple of
times, this seems to help hook the bead into the rim. then follow your directions. Being careful
is key though. I've screwed up enough tubes to know enough

to

Quoted message said:

take my time :-) Denny in Sayre, Pa "Bent but not broken" www.recumbentstuff.com

"Al Kubeluis" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Hi Pieter, You describe a good procedure below. I have found that having talcum powder on tube
and inside of wheel

rims

Quoted message said:

helps with seating and getting tire on rim. Also using full gloves

(not

Quoted message said:

biking gloves with exposed fingers) or a rag or a handkerchief helps fingering tire onto rim,
since a better grip on tire is provided. A Zipp Stick works better for me than plastic or metal
tire irons,

since

Quoted message said:

irons tend to pinch tube especially if used to put tire on. But flat fixing on the road is still
time consuming and aggravating.
--
~~~al.kubeluis..md.usa.earth.sun.milkyway.virgo.universe..corsa~~~

"Pieter Litchfield" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

I have found you can experience this problem (as described below) even

with

Quoted message said:

properly rims and tires if you don't mount them correctly.

My procedure is as follws:

Be sure the rim tape is clean and there are no protruding or uncovered

spoke

Quoted message said:

nipples. Repair or replace as necessary.

Unfold new tube or place old tube inside tire, slightly inflate to

push

Quoted message said:

it

Quoted message said:

Quoted message said:

into place, then deflate somewhat. Leave tube in tire.

Line use valve stem with hole in rim. Partially insert stem and then

place

Quoted message said:

1

Quoted message said:

bread on tire/tube combo over 1 side of rim . Be sure that tire is

deflated

Quoted message said:

enough, work other bead over rim with fingers. This can be done if

you

Quoted message said:

Quoted message said:

make

Quoted message said:

sure the bread is pushed toward the center of the rim channel all the

way

Quoted message said:

Quoted message said:

around as it is being installed. I haven't used a "tire iron" for

assembly

Quoted message said:

in years.

Check carefully for a trapped inner tube by squeezing the beads of the

tire

Quoted message said:

toward the center and looking for a tube curled under both tire beads.

If

Quoted message said:

Quoted message said:

installed properly, the tube should not be visible when the tire side

are

Quoted message said:

Quoted message said:

squeezed towards the center. If found, fix it.

Once the tire is installed, inflate to 20 lbs, then deflate to "set"

the

Quoted message said:

Quoted message said:

Quoted message said:

tube in the tire.

Look for a fine line molded into the tire just above the rim bead.

Assuming

Quoted message said:

its a road tire, inflate to about 30 lbs, and look carefully at both

sides -

Quoted message said:

the fine line should be evenly spaced away from the rim all the way

around.

Quoted message said:

If not, deflate tire, and try to recenter ther tire by pulling on

"short"

Quoted message said:

Quoted message said:

side (where line disappears behind rim). Note that sidewall

coloration

Quoted message said:

or

Quoted message said:

Quoted message said:

tread edge lines may not be symetrical - always use molded in rim

lines

Quoted message said:

on

Quoted message said:

Quoted message said:

tire to judge centering.

Inflate to working pressure. Check centering line again. Deflate and rework as necessary.

I have had good fitting tires pop off the rim when inflated for the

first

Quoted message said:

Quoted message said:

time if they were not mounted reasonably well centered. After

replacing

Quoted message said:

Quoted message said:

the

Quoted message said:

tube, these same tires (properly mounted) have given good service.

"Lennert Thunberg" <[email hidden]> wrote in message
"]news:[email hidden]...
> >bentcruiser" <[email hidden]> wrote in message
> "]news:[email hidden]...
> > I had not yet put on my favorite touring tires (Schwalbe

Marathons)

Quoted message said:

on

Quoted message said:

Quoted message said:

> > my Canto until yesterday. My current tubes did not fit the tires

so

Quoted message said:

I

Quoted message said:

Quoted message said:

> > had to get some that did.
> >
> > I rode approximately 100 feet on the tires and the rear tire went

thump,

Quoted message said:

> > thump, thump BLAM!
>
> You should be using a larger tube, but that is not what caused the
blowout.
> Your blowout was a classic case of the tire not being seated evenly

around

Quoted message said:

> the rim, or the tube was pinched between the tire and the rim. One

part

Quoted message said:

Quoted message said:

of
> the tire bead started to protrude over the rim, allowing the tube to

bulge

Quoted message said:

> out (hence the thumping of the tire or tube hitting the brake shoe).

Once

Quoted message said:

> this occurs it is only seconds until the bulging part of the tube
EXPLODES.
> The one time this happened to me people came out of their houses to

see

Quoted message said:

if

Quoted message said:

> someone was shooting.
>
> Not all tires and rims of the "correct" size mate properly. Some

tire

Quoted message said:

Quoted message said:

and

Quoted message said:

> rim combinations are of such a loose fit that "blowouts" are more

likely

Quoted message said:

to
> happen. I once had to buy a different brand of rim to properly

match

Quoted message said:

Quoted message said:

the

Quoted message said:

> tire I wanted to use. The manufacturing tolerances for rims and

tires

Quoted message said:

Quoted message said:

are

Quoted message said:

> apparently pretty loose.
>
> Len
>
>
>

The Schwalbe has been returned. The bike shop found some flaws in the tire other than what caused the blow out. So it is being returned.

Derek

I bought myself a 26in Marathon about a week ago, and I was able to get Schwalbe tubes to fit them (26x1.25).

This contrasts with the Stelvio it replaced, a tyre for which Schwalbe don't appear to make a tube. I got rid of the Stelvio after two pinch flats in as many days (and before anybody tells me to pump harder, I was running at the maximum recommended pressure).

Chris

Quoted post said:

Originally posted by bentcruiser
The Schwalbe has been returned. The bike shop found some flaws in the tire other than what caused the blow out. So it is being returned.

Derek

I just got a new wheel and the rim looks like it is very much thinner than the tire (a Tioga Comp
Pool). I have ridden 71 miles on the tire but I am a bit nervous. My LBS had their doubts about the
wheel/tire combination prior to installation, but now says that if it were going to blow, it would
have by now. (Their test is to fill the tire and bounce the wheel a few times.)

Do I have anything to worry about?

Andy Richard

Quoted message said:

Posted via cyclingforums.com cyclingforums.comcyclingforums.comOpen ↗

just a test post

--
Dave 98GTW [email hidden] (remove nospam to reply directly) Presto, Presto II, Screamer

Sheldon can help : sheldonbrown.comtire sizing.htmlOpen ↗ waaay down on the page (look for
Width Considerations).

Regards, Torben "Andy" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

I just got a new wheel and the rim looks like it is very much thinner than the tire (a Tioga Comp
Pool). I have ridden 71 miles on the tire but I am

a

Quoted message said:

bit nervous. My LBS had their doubts about the wheel/tire combination

prior

Quoted message said:

to installation, but now says that if it were going to blow, it would have by now. (Their test is
to fill the tire and bounce the wheel a few

times.)

Quoted message said:

Do I have anything to worry about?

Andy Richard