more 29-er flat problems

I had a similar problem with my new 28" uni. The original tube popped
loudly when I increased the pressure from 50lbs to 65lbs.

Inspecting the tire, I found shavings of metal (brass looking)inside the
tire. I suspect the shavings came from the spoke nuts rubbing the rib
while the spokes were being tuned.

What I did was wipe the inside of the tire clean, replace the rubber
tube protector with that cloth 'tube protector' tape from the bike
shop. Replaced the tube. When filling, fill ~30lbs, deflate, then fill
again.

I'm no expert but I now have 70lbs in the tire now. Good luck.


--
Chrashing

Regards,
Chrashing
------------------------------------------------------------------------
Chrashing's Profile: http://www.unicyclist.com/profile/7501
View this thread: http://www.unicyclist.com/thread/34547

Oh yeah, Those tires are loud when they pop. My ears were ringing for a
few minutes.


--
Chrashing

Regards,
Chrashing
------------------------------------------------------------------------
Chrashing's Profile: http://www.unicyclist.com/profile/7501
View this thread: http://www.unicyclist.com/thread/34547

Chrashing wrote:
*Inspecting the tire, I found shavings of metal (brass looking)inside
the tire. I suspect the shavings came from the spoke nuts rubbing the
rib while the spokes were being tuned. *

Metal shavings can be left in the rim after manufacture. The drilling
of the spoke holes can leave shavings either floating around between the
walls of the rim or still attached to the spoke hole.

When the wheel is built it should have been checked to make sure there
were no metal shavings in it. All of the spoke holes should have been
checked to make sure they were clean and then compressed air blown
through (carefully) to make sure no shavings were floating around in the
walls of the rim.

A metal shaving from the rim is no match for most rim strips. A shaving
can easily poke through a cloth or rubber rim strip. I got a flat on my
freestyle unicycle back when it was new due to a metal shaving hiding
under the rim tape.


--
john_childs - Guinness Mojo

john_childs (at) hotmail (dot) com
Gallery: '' (http://www.unicyclist.com/gallery/john_childs)
------------------------------------------------------------------------
john_childs's Profile: http://www.unicyclist.com/profile/449
View this thread: http://www.unicyclist.com/thread/34547

I once had chronic flats on a road bike due to a tire with a bad bead.
The tire passed a visual inspection, but replacing it fixed my problem.
It had the "loud bang" problem due to the tube poking out the side of
the tire as I approached a moderate tire pressure using a floor pump.


--
mscalisi - Not such a newbie anymore
------------------------------------------------------------------------
mscalisi's Profile: http://www.unicyclist.com/profile/4961
View this thread: http://www.unicyclist.com/thread/34547

On Sat, 14 Aug 2004 21:47:15 -0500, "onewheeldave" wrote:

Concerning Big Apples- is anyone here using them successfully on a
Nimbus 700c (or similar) rim?

One of my possible future upgrades was going to be getting the new 29-er
Nimbus frame and putting a Big Apple in, but I wonder if it will work
without a wider rim.

I bought my Nimbus with a 35 mm tyre. Later I retrofitted the Big
Apple 2.35" with no problem. The rim's inside width is only 22 mm and
the rimstrip states 26x1.75/2.125. It is a 700c wheel so the 26
puzzles me. The Big Apple is wider than 2.125 but it runs very fine. I
keep it at about 3 - 4 bar which is around 50 psi. I use it almost
exclusively for road rides for which it is excellent - no folding over
at that pressure.

Note that the Nimbus II frame (square crown) is OK for clearance, but
the round Nimbus I (28")doesn't accept the 28 x 2.35 Big Apple.

Klaas Bil - Newsgroup Addict
--
I like the idea of not having to balance when out on a ride - joe

onewheeldave Wrote:
Having established on a different thread that my recent, very frequuent
29-er punctures were probably pinch flats caused by too low tyr
pressure, I bought a track pump with built in guage

A few puncture free rides at around 50 psi seemed to have resolved th
problem

The only down point was a few days ago when I removed the tyre to d
some wheel truing. I decided to inflate it to 65 psi, the max on th
tyres range; just before getting to 65 there was a really loud bang a
the tube exploded

New tube and back down to 50-55 psi

Then today I got another puncture. Though I'd just bought yet anothe
spare 700x45c tube I decided to do a repair on the damaged one, partl
to save the hassle of having to take the wheel off

It went OK, then I inflated the tube, no track pump available here so
did my best with the hand pump, knowing that I wouldn't get it up to 5
psi

I decided to get the tyre as hard as possible- as soon as I'd finishe
there was a nasty sound of air escaping, and it deflated in seconds

Annoyed now I took the tube out again to find another hole had appeare
in a different place! How could this happen without even riding th
thing

As the hole was near the seam I decided to switch in the spare, an
managed to ride home on it without incident

------------

Can anyone offer useful insights into this problem, because I'm deepl
confused and on the verge of giving up 29-ing, if only because I'v
bought four tubes (and a track pump) this month alone and can't justif
the expense

My thoughts are that I do need to keep the pressure up with the trac
pump to avoid pinch flats, but also that maybe I need to stay away fro
the max of 65 psi

So I'm currently going to stay at 40-45 psi and see what happens

Would it be true to say that, given pressure is not so low that pinc
flats are a problem, that going much higher makes normal punctures mor
likely

Also, as the tyre ratings are meant for a bike, couldn't it be the cas
that they would not apply when used on a unicycle, as, being on
wheeled, there will be around twice the stress on it

Can anyone briefly explain what causes a pinch flat; I know the norma
explanation is that it's when the tube gets trapped between rim an
tyre, but, assuming that the tube is installed properly, how can thi
occur. Certainly my flats seem to be happening on normal riding i.e
no
when dropping off curbs etc

Has anyone else had problems with excessive 29 flats? One of m
theorie
is that maybe the tubes are faulty, possibly sat in the shop too long
although this is no help as tubes don't come with a sell by date

Another possibility is that, because my rim isn't designed for 29-in
(it's the old style nimbus 700c and consequently quite narrow) tha
thi
is causing the punctures. Although this wouldn't explain why it was O
during my last big 29-er phase at the beginning of this year, when
wa
riding every day for around a month and don't recall any flats


-
onewheeldave - Semi Skilled Unicyclis

Dave your one wheel or shall I say tyre probably has a thorn or simile
in it.Run your hand slowly around the inside of the tyre to try t
locate it

--
cheechee

I had some flat problems with the Big Apple, but that's becuase I was
going urban off road (no drops). I switched to the Nanorapter, with
good results so far.

Billy


--
BillyTheMountain
------------------------------------------------------------------------
BillyTheMountain's Profile: http://www.unicyclist.com/profile/5357
View this thread: http://www.unicyclist.com/thread/34547

When Peter Bier, Steve Pavarno and I did 'The 42nd Traverse'
(http://tinyurl.com/4d7gw) on 29ers Peter got 2 punctures. (As well as
that I broke a cotterpin and had to walk out, but that's another story.)
Both punctures were pinch flats. The cure I'd recommend is to get a
thicker walled 29" specific inner tube. A standard 28"/700Cx45 will be
stretched to the point of being very thin inside a 29 inch tyre. This
makes it very easy to get pinchflats, especially during offroad riding.
There are at least three different 29" specific inner tubes available,
'one of which is made by WTB' (http://tinyurl.com/65j9y).


+0}\[y


--
TonyMelton - www.unicycle.co.nz

See some photos of the first 'NZ MUni Weekend'
(http://gallery.unicyclist.com/NZ-MUni-Weekend-2004)
------------------------------------------------------------------------
TonyMelton's Profile: http://www.unicyclist.com/profile/2118
View this thread: http://www.unicyclist.com/thread/34547

Another day, another puncture

Felt this one go- an audible pop while riding up a hill.

Not a pinch flat this time, but a single hole facing the rim and right
over a spoke.

I'm guessing that it was caused by the top of the spoke nipple which is
one of the ones that got a bit shredded during an attempt to tighten it
with a screwdriver last week.

I think my priority has to be to get a decent rim strip, the present one
is thin rubber and doesn't look as though it could be much use.

Being Sunday there was nowhere open to buy one so I've improvised my own
with some wrapped newspaper.

Tony, I checked your link- those tubes look a bit expensive, and they
only seem to come with presta valves with I try to avoid.

I think I'd be more inclined to get one when I've got a better
understanding of why I'm getting so many punctures, especially as the
punctures seem to be of different types- I'm suspecting that there's
more than one thing wrong here.

It'd be a shame to get a pricey tube to stop the pinch flats, and have
it ruined by the normal punctures I'm also getting.

On the positive side I've learnt some useful stuff from this problem, an
internet search turned up a method of getting tyres of the rim without
using levers and on todays puncture Igot the tyre off easily with only
my hands and also got it back on again without levers


--
onewheeldave - Semi Skilled Unicyclist

"He's also been known to indulge in a spot of flame juggling - but it's
the Muni that really fires him up."

------------------------------------------------------------------------
onewheeldave's Profile: http://www.unicyclist.com/profile/874
View this thread: http://www.unicyclist.com/thread/34547