29'er flat problems

does specialized make an "armadillo" tire in that size? those are really
sweet and prevent flats like crazy, there's also slime type liners that
you put between the tire and the tube.

--
markf

stuck in iowa and unemployed.
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Terry,

My KH-29 came with a schrader valve but the extra tube I ordered from
UDC came with a Presta. I too would like to find a source for schrader
valve 29 inch tubes--I know they exist because they come stock on the
KH-29.

Anybody know where to find one?

Carey

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Carey
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Is it a different thorn every time? Are you sure? I say this because I
have had phases in my cycling career when I've had series of punctures
and have only been able to put a stop to it by junking the tyre.

What sometimes happens is a bit of thorn breaks off and is embedded in
the rubber just so fat that you can't detect it. Then you ride, and
your weight deforms the tyre and the thorn punctures the tube. I had
it on my tandem many years ago, and on my MUni about 2 years ago.
Changed the tyre and no punctures since.

Failing that:

You can buy pre-slimed tubes with Presta valves. But I suppose if you
bought a new tube, you could buy one with a Schraeder valve anyway.

Run the tyre at a higher pressure. Soft tyres fold round thorns (etc.)
and give the thorn a moment to bite. A hard tyre will often just break
or dispalce the thorn. Definitely, soft tyres are more vulnerable than
hard.

Another option is Kevlar tape between the tube and the tyre. I know
it's available. My limited experience of using it was that it isn't
all that good, though.

--
Mikefule

🙂
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Schwalbe makes a 29er tube with a schrader valve. You can order them
from their web site, 'Schwalbe Tubes North America'
(http://www.schwalbetires.com/tubes.php).

You'll want the AV-19 tube.
AV is their Schrader
SV is thier Presta

Minimum order is $15 which works out to 3 tubes.
I've been using the Schwalbe tubes on my Coker. They're good tubes.
The AV-19 and SV-19 fit their Big Apple 29er tire so it has plenty of
volume for a big 29er tire.

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john_childs

john_childs (att) hotmail (dott) com
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Thanks guys, I don't know why I was unable to find that. I guess the
first place you go blind is in the eyes 😉
Terry

--
terryb99
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Most Trek or Fisher bicycle dealers have 29er slime tubes under the
Bontrager name. They also come in longer valve versions if you've got
deep rims. I don't really like liners as I've seen more flats caused
by the liner itself than the thorns they're supposed to stop. I've
also had great luck with 700/35-45 tubes instead of often costlier 52c
versions. They stretch after all. Also, go ahead and drill out those
rims for schrader valves if you want to slime them yourself.
E pluribus uni

--
tommillermn
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Thorns don't usually stick in the tube until a couple of rotations after
they get picked up by the tyre. You could try rigging up a thorn
catcher like people used to do (some still do) on bikes - basically its
just a bit of wire attached to the frame with a flexible joint (bit of
rubber tubing) and bent in such a way that it just drags on the tyre.
They flick any picked up thorns out of the tyre before they get a
chance to stick in. Only works with relatively smooth tyres though.

Other than that, I've had very positive experiences with Continental
Gator-skin tyres - I've been using them on my bike for a few years and
hardly had any punctures in that time. But I think the biggest they
make is 700c x 28, so only really suitable for masochists like
Mikefule.

Rob

--
rob.northcott

You do not need a parachute to skydive. You only need a parachute to
skydive twice
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I've seen a bike fitted with a kind of metal thingy very close to the
tire. The idea is to scrape away little stones, thorns etc. before they
work themselves into the tire.

I don't have a picture, but I'll try with a bit of ascii art

=(O---o---O

It's a wheel cut in half.

=( is the scraper thingy,
O is the rim and tire,
--- is spokes, and
o is the hub.

Theyre supposed to work well if the tire isn't too knobby.

<Edit>
Oh, that was what Rob just posted about. That'll teach me to read the
entire thread before posting a reply :o
</Edit>

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Borges
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rob.northcott said:

Tonly really suitable for masochists like Mikefule.

You mean there are people like me?:eek:

--
Mikefule

OK, so what -did -the knights in white sit in?
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