innertube slippage

— Jeremy Nichols <mohawk@mail.com> wrote:
> At 06:58 08/02/00 GMT, Chris Reeder wrote:
> >Also, the tire shifts on the rim some when I ride
> it, so that the valve
> >stem is now angled about 30 degrees off of
> perpendicular. Does this happen
> > to any of you?

This happens to me if I’m using an innertube that is too small for the tire.
Possibly that may be the problem.

-Kris.


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Re: innertube slippage

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Kris Holm wrote:
> This happens to me if I’m using an innertube that is too small for the tire.
> Possibly that may be the problem.

Yeah, I was too cheap to buy a downhill tube for this baby. But some=20 things
can’t be avoided. =20

John Foss wrote: <If the tire is shifting, you definitely have to make some
kind of=20 change. <You didn’t mention the width of your rim, but if it’s too
narrow it’s=20 not a <good combination with the wide tire. The tire only
works best with a=20 wide <rim, to provide you the support without folding
over or pinching.

On the side of the tire it actually specifies what width of rim it=20 needs: “DH
use requires rim of 28mm width or greater” I’m not sure if you measure to the
outside of the rim, or to the=20 inside where the bead sits. But the rim I’ve
got is about 32mm to the=20 outside edges. So I think I’m legal here (barely).
Of course I’d=20 love to have a Sun DoubleWide if anybody has one lying around:)

Tim B. wrote: <It sounds like you’re using the “schrader” (sp?) type valve,
the=20 kind that <comes standard with many bikes and unicycles. I would
recommend=20 switching <tube styles to “presta” valves (just about any good bike
shop will=20 have <them.) They’re a little more expensive, but worth it. They
have a=20 steel <shank that’s threaded, with a lock nut to tighten it into the
rim. =20 As long <as the lock nut is tightened, it can’t slip. Besides, with a
steel=20 shank, <you can’t wear through it anyway.

Yep, I’ve got a schrader in it. I had asked the bike shop about using=20 a
presta instead. But he seemed to think that it would just shear the=20 rubber if
I did that on a tube that was going to slip anyway. But=20 it’s just a tube,
right? =20

John Childs wrote: <But before I would try gluing the tire to the rim I would
first make=20 sure=20 <that the rim is wide enough for the tire and that the
tube is fat=20 enough for=20 <the big tire.

<Do you happen to coat the tube and inside of the tire with talcum=20 powder?
I=20 <put talcum powder in my unicycle tires in the unproven belief that it=20
helps=20 <prevent pinch flats. That would tend to make the tube slip more at=20
low=20 <pressures.=20

No, actually, I didn’t have any talcum powder in it. But I should=20 have put
some in my 27x1.25 uni the other day. After patching, part=20 of the tube ended
up stuck between the tire bead and the rim bead. I=20 figured it would take care
of itself-- and it did. With a loud POP=20 at 85 psi! I have since bought a set
of Park Tool tire wrenches to=20 make sure I get the tire and tube where they
belong. Stubborn skinny =20 tires… =20

Thanks for the advice, everybody that responded. I think I’ll wait=20 till this
tube dies and then get the right size for the job.=20

Chris Reeder Moscow, Idaho =20

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innertube slippage</TITLE> <META NAME=3D"GENERATOR" CONTENT=3D"StarOffice/5.1
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Kris Holm wrote: > This happens to me if I’m using an innertube that is >
too small for the tire. Possibly that may be the > problem.

<FONT COLOR=3D"#0000ff"><FONT SIZE=3D3>Yeah, I was too cheap to buy a do= wnhill
tube for this baby. But some things can’t be avoided.</FONT> </FONT>=20

John Foss wrote: <If the tire is shifting, you definitely have to make some
kind of change. <You didn’t mention the width of your rim, but if it’s too
narrow it’= s not a <good combination with the wide tire. The tire only works
best with a=

wide <rim, to provide you the support without folding over or pinching.

<FONT COLOR=3D"#0000ff"><FONT SIZE=3D3>On the side of the tire it actual= ly
specifies what width of rim it needs: “DH use requires rim of 28mm width or
greater”</FONT><= /FONT> <FONT COLOR=3D"#0000ff"><FONT SIZE=3D3>I’m not
sure if you measure to th= e outside of the rim, or to the inside where the bead
sits. But the rim I’ve got is about 32mm to the outside edges. So I think I’m
legal here (barely). Of course I’d love to have a Sun DoubleWide if anybody has
one lying around:)</FONT></FONT>

Tim B. wrote: <It sounds like you’re using the “schrader” (sp?)
type val= ve, the kind that <comes standard with many bikes and unicycles. I
would recommend switching <tube styles to “presta” valves (just
about any good bike s= hop will have <them.) They’re a little more expensive,
but worth it. They have a steel <shank that’s threaded, with a lock nut to
tighten it into the rim. = As long <as the lock nut is tightened, it can’t
slip. Besides, with a steel shank, <you can’t wear through it anyway.

<FONT COLOR=3D"#0000ff"><FONT SIZE=3D3>Yep, I’ve got a schrader in it. = I had
asked the bike shop about using a presta instead. But he seemed to think that it
would just shear the rubber if I did that on a tube that was going to slip
anyway. But it’s just a tube, right? </FONT></FONT>

<FONT SIZE=3D2>John Childs wrote:</FONT> <FONT SIZE=3D2><But before I would
try gluing the tire to the rim I w= ould first make sure </FONT> <FONT
SIZE=3D2><that the rim is wide enough for the tire and that the= tube is fat
enough for </FONT> <FONT SIZE=3D2><the big tire.</FONT>

<FONT SIZE=3D2><Do you happen to coat the tube and inside of the tire= with
talcum powder? I </FONT> <FONT SIZE=3D2><put talcum powder in my unicycle
tires in the unprove= n belief that it helps </FONT> <FONT SIZE=3D2><prevent
pinch flats. That would tend to make the tub= e slip more at low </FONT> <FONT
SIZE=3D3><FONT SIZE=3D2><pressures. </FONT></FONT>

<FONT COLOR=3D"#0000ff"><FONT SIZE=3D3>No, actually, I didn’t have any t= alcum
powder in it. But I should have put some in my 27x1.25 uni the other day. After
patching, part of the tube ended up stuck between the tire bead and the rim
bead. I figured it would take care of itself-- and it did. With a loud
<B>POP</B> at 8= 5 psi! I have since bought a set of Park Tool tire wrenches to
make sure I get the tire and tube where they belong.<FONT SIZE=3D2>
</FONT>Stubborn = skinny tires… </FONT></FONT>

<FONT COLOR=3D"#944794"><FONT SIZE=3D3>Thanks for the advice, everybody = that
responded. I think I’ll wait till this tube dies and then get the right size for
the job. </FONT></FO=
NT>

<FONT COLOR=3D"#944794"><FONT SIZE=3D3>Chris Reeder</FONT></FONT> <FONT
COLOR=3D"#944794"><FONT SIZE=3D3>Moscow, Idaho </FONT></FONT>

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