Tire creeping over rim

Hello All,

One of the pair of new tires I recently acquired seems to have a tendency
to creep up the inside of the rim, until finally the tube is exposed and
explodes with a bang. I'm not sure whether I'm doing something wrong,
whether I might have a defective tire, or whether there might be a size
mismatch. Some clues:

1. Only one of the pair of tires shows this symptom (so far...); it has
happened when this tire was mounted on both front and back wheels.

2. Failure seems to occur near the valve. A thin strip of rubber has been
scraped off the tire as a result, exposing what appears to be the surface
of the wire bead. But when I remounted it with this section away from the
valve, the next failure still occurred near the valve (see No. 4, below).

3. Twice, the failure occurred after the tire was pumped up and was just
sitting there... after about 10 minutes. Once on the front wheel, once on
the back.

4. The other day after a long descent (with a lot of braking), the rear
brake started to rub badly. Inspection showed that the tire was partially
unseated, but the tube had not popped. I deflated it, massaged the tire a
bit and reinflated it with a hand pump, to about half the rated max
pressure. Rode home with no further problems. After this, moved the tire
to the front wheel (with a new tube) and inflated to max pressure (6 atm =
85 lbs). Ten minutes later, BANG! Tire creep and tube failure, near the
valve.

5. Wheels: Bontrager Maverick (on a Trek 520). Old tires were Bontrager
Select 700x35C, new tires Schwalbe Marathon Trekking, also 700x35C. Rims
do not show any irregularity.

I don't know whether to keep using the other tire and get one replacement,
or whether it's something I'm doing. I've never had such problems in the
past, and I've replaced a fair number of tubes and tires over the years.
Could it be that I'm tightening the little ring nut on the valve? This
would pull the tube closer to the rim, perhaps keeping it from seating
itself deep in the tire... But then why does the other tire not misbehave?
Is there some size mismatch between Schwalbe and Bontrager? Could these
tires be prone to pinching?

Suggestions appreciated!

Cheers, AMG

----------
a m g 0 0 1 @ e a r t h l i n k * n e t

- Wrote:
Hello All,

One of the pair of new tires I recently acquired seems to have
tendency
to creep up the inside of the rim, until finally the tube is expose
and
explodes with a bang. I'm not sure whether I'm doing something wrong,
whether I might have a defective tire, or whether there might be
size
mismatch. Some clues:

1. Only one of the pair of tires shows this symptom (so far...); i
has
happened when this tire was mounted on both front and back wheels.

2. Failure seems to occur near the valve. A thin strip of rubber ha
been
scraped off the tire as a result, exposing what appears to be th
surface
of the wire bead. But when I remounted it with this section away fro
the
valve, the next failure still occurred near the valve (see No. 4
below).

3. Twice, the failure occurred after the tire was pumped up and wa
just
sitting there... after about 10 minutes. Once on the front wheel, onc
on
the back.

4. The other day after a long descent (with a lot of braking), th
rear
brake started to rub badly. Inspection showed that the tire wa
partially
unseated, but the tube had not popped. I deflated it, massaged the tir
a
bit and reinflated it with a hand pump, to about half the rated max
pressure. Rode home with no further problems. After this, moved th
tire
to the front wheel (with a new tube) and inflated to max pressure (
atm =
85 lbs). Ten minutes later, BANG! Tire creep and tube failure, nea
the
valve.

5. Wheels: Bontrager Maverick (on a Trek 520). Old tires wer
Bontrager
Select 700x35C, new tires Schwalbe Marathon Trekking, also 700x35C
Rims
do not show any irregularity.

I don't know whether to keep using the other tire and get on
replacement,
or whether it's something I'm doing. I've never had such problems i
the
past, and I've replaced a fair number of tubes and tires over th
years.
Could it be that I'm tightening the little ring nut on the valve? This
would pull the tube closer to the rim, perhaps keeping it from seating
itself deep in the tire... But then why does the other tire no
misbehave?
Is there some size mismatch between Schwalbe and Bontrager? Coul
these
tires be prone to pinching?

Suggestions appreciated!

Cheers, AMG

----------
a m g 0 0 1 @ e a r t h l i n k * n e t
sounds like you should try another new tire. Possible damage to th
tire.
When you remove the tire is the hook part of the rim clear of any ri
tape/strip

--
daveornee

- Wrote:
Hello All,

One of the pair of new tires I recently acquired seems to have
tendency
to creep up the inside of the rim, until finally the tube is expose
and
explodes with a bang. I'm not sure whether I'm doing something wrong,
whether I might have a defective tire, or whether there might be
size
mismatch. Some clues:

1. Only one of the pair of tires shows this symptom (so far...); i
has
happened when this tire was mounted on both front and back wheels.

2. Failure seems to occur near the valve. A thin strip of rubber ha
been
scraped off the tire as a result, exposing what appears to be th
surface
of the wire bead. But when I remounted it with this section away fro
the
valve, the next failure still occurred near the valve (see No. 4
below).

3. Twice, the failure occurred after the tire was pumped up and wa
just
sitting there... after about 10 minutes. Once on the front wheel, onc
on
the back.

4. The other day after a long descent (with a lot of braking), th
rear
brake started to rub badly. Inspection showed that the tire wa
partially
unseated, but the tube had not popped. I deflated it, massaged the tir
a
bit and reinflated it with a hand pump, to about half the rated max
pressure. Rode home with no further problems. After this, moved th
tire
to the front wheel (with a new tube) and inflated to max pressure (
atm =
85 lbs). Ten minutes later, BANG! Tire creep and tube failure, nea
the
valve.

5. Wheels: Bontrager Maverick (on a Trek 520). Old tires wer
Bontrager
Select 700x35C, new tires Schwalbe Marathon Trekking, also 700x35C
Rims
do not show any irregularity.

I don't know whether to keep using the other tire and get on
replacement,
or whether it's something I'm doing. I've never had such problems i
the
past, and I've replaced a fair number of tubes and tires over th
years.
Could it be that I'm tightening the little ring nut on the valve? This
would pull the tube closer to the rim, perhaps keeping it from seating
itself deep in the tire... But then why does the other tire no
misbehave?
Is there some size mismatch between Schwalbe and Bontrager? Coul
these
tires be prone to pinching?

Suggestions appreciated!

Cheers, AMG

----------
a m g 0 0 1 @ e a r t h l i n k * n e t
sounds like you should try another new tire. Possible damage to th
tire.
When you remove the tire is the hook part of the rim clear of any ri
tape/strip

--
daveornee

2. Failure seems to occur near the valve. A thin strip of rubber has

IMO, this is the most telling part. You might need to press the valve into
the tire once everything is seated, as the thick rubber part around the
valve doens't fully enter the space the tire encloses. As a result it sits
more between the rim and the tire bead, forcing it up and over and blowing
up.

Actually with your larger tires, it's less of a concern, but check to see
that you're getting the tube all the way in the tire.

Try asking an LBS... they might see the problem immediately, and they should
give you a quick tutorial how to replace a tube at no charge.

--
Phil, Squid-in-Training

2. Failure seems to occur near the valve. A thin strip of rubber has

IMO, this is the most telling part. You might need to press the valve into
the tire once everything is seated, as the thick rubber part around the
valve doens't fully enter the space the tire encloses. As a result it sits
more between the rim and the tire bead, forcing it up and over and blowing
up.

Actually with your larger tires, it's less of a concern, but check to see
that you're getting the tube all the way in the tire.

Try asking an LBS... they might see the problem immediately, and they should
give you a quick tutorial how to replace a tube at no charge.

--
Phil, Squid-in-Training

On Mon, 04 Oct 2004 09:35:55 +1000, daveornee wrote:


- Wrote:
Hello All,

One of the pair of new tires I recently acquired seems to have a
tendency to creep up the inside of the rim, until finally the tube is
exposed and explodes with a bang...

...........
sounds like you should try another new tire. Possible damage to the
tire. When you remove the tire is the hook part of the rim clear of any
rim tape/strip?
...........

You might need to press the valve into the tire once everything is
seated, as the thick rubber part around the valve doesn't fully enter
the space the tire encloses. As a result it sits more between the rim
and the tire bead, forcing it up and over and blowing up.
...........

The inside of the rim looks pretty clean, with the tape well centered. The
wheels only have about 3000 miles on them, so they're still fairly new...

Will try inflating the thing once more, while pushing in the valve to make
sure all the rubber is deep inside the tire, where it belongs...


Thanks for the responses so far! Will keep checking back.

----------
a m g 0 0 1 @ e a r t h l i n k * n e t

On Mon, 04 Oct 2004 09:35:55 +1000, daveornee wrote:


- Wrote:
Hello All,

One of the pair of new tires I recently acquired seems to have a
tendency to creep up the inside of the rim, until finally the tube is
exposed and explodes with a bang...

...........
sounds like you should try another new tire. Possible damage to the
tire. When you remove the tire is the hook part of the rim clear of any
rim tape/strip?
...........

You might need to press the valve into the tire once everything is
seated, as the thick rubber part around the valve doesn't fully enter
the space the tire encloses. As a result it sits more between the rim
and the tire bead, forcing it up and over and blowing up.
...........

The inside of the rim looks pretty clean, with the tape well centered. The
wheels only have about 3000 miles on them, so they're still fairly new...

Will try inflating the thing once more, while pushing in the valve to make
sure all the rubber is deep inside the tire, where it belongs...


Thanks for the responses so far! Will keep checking back.

----------
a m g 0 0 1 @ e a r t h l i n k * n e t

- wrote:

Hello All,

One of the pair of new tires I recently acquired seems to have a tendency
to creep up the inside of the rim, until finally the tube is exposed and
explodes with a bang. I'm not sure whether I'm doing something wrong,
whether I might have a defective tire, or whether there might be a size
mismatch. Some clues:

I've had a tyre-rim mismatch problem, but only with some v cheap rims
which had no hook bead. Regardless, if they don't match, change them!

James
--
If I have seen further than others, it is
by treading on the toes of giants.
http://www.ne.jp/asahi/julesandjames/home/

- wrote:

Hello All,

One of the pair of new tires I recently acquired seems to have a tendency
to creep up the inside of the rim, until finally the tube is exposed and
explodes with a bang. I'm not sure whether I'm doing something wrong,
whether I might have a defective tire, or whether there might be a size
mismatch. Some clues:

I've had a tyre-rim mismatch problem, but only with some v cheap rims
which had no hook bead. Regardless, if they don't match, change them!

James
--
If I have seen further than others, it is
by treading on the toes of giants.
http://www.ne.jp/asahi/julesandjames/home/

James Annan wrote:
- wrote:

Hello All,

One of the pair of new tires I recently acquired seems to have a
tendency to creep up the inside of the rim, until finally the tube
is exposed and explodes with a bang. I'm not sure whether I'm doing
something wrong, whether I might have a defective tire, or whether
there might be a size mismatch. Some clues:

I've had a tyre-rim mismatch problem, but only with some v cheap rims
which had no hook bead. Regardless, if they don't match, change them!

James

Sounds like a *massive* coverup on the part of the rim manufacturers to me!
It's easy to write it off as nothing but cheap tires, but basic analysis
shows numerous instances where cheap rims won't hold onto tire beads.....and
the CPSC hasn't done ANYTHING about it!

(couldn't resist)

Tom