Cable Guide Hole Too Small?

[John]

Hello Esteemed Bike Wrenchers,

I am building up a Colnago Master X Light. Things were
moving along fine until I tried to secure the derailleur
cable guide to the bottom bracket shell. The screw wont fit,
as a matter of fact, I can't see any threads in the hole.
What are the chances the opening is not threaded?

The calipers say the screw is about 5mm, the hole is about
3mm . Is there a smaller screw for Italian Frames? Any
suggestions on how to make this work would be appreciated. I
can't believe that Ernesto would let a frame go out the door
unfinished.

Thanks,

John

 

[Alex Rodriguez]

In article
<[email protected]>,
[email protected] says...
>Hello Esteemed Bike Wrenchers, I am building up a Colnago
>Master X Light. Things were moving along fine until I tried
>to secure the derailleur cable guide to the bottom bracket
>shell. The screw wont fit, as a matter of fact, I can't see
>any threads in the hole. What are the chances the opening
>is not threaded?

Colnago's aren't known for their high quality and attention
to detail. They do have nice paint jobs.

>The calipers say the screw is about 5mm, the hole is about
>3mm . Is there a smaller screw for Italian Frames? Any
>suggestions on how to make this work would be appreciated.
>I can't believe that Ernesto would let a frame go out the
>door unfinished.

Use a tap to tap the existing hole. If this was me, I would
take it back to the shop where I paid the big bucks and have
them fix the problem.
--------------
Alex

 

[Phil Brown]

> am building up a Colnago Master X Light. Things were
> moving along fine until I tried to secure the
> derailleur cable guide to the bottom bracket shell. The
> screw wont fit, as a matter of fact, I can't see any
> threads in the hole.

It may be a drain hole. Are there any other ways to run the
cable? Phil Brown

 

[Wannagofast]

Perhaps little eyelets brazed to the shell?

"Phil Brown" <[email protected]> wrote in message news:20040703214803.23133.00000967@mb-
m07.aol.com...
> > am building up a Colnago Master X Light. Things were
> > moving along fine until I tried to secure the
> > derailleur cable guide to the bottom bracket shell. The
> > screw wont fit, as a matter of fact, I can't see any
> > threads in the hole.
>
> It may be a drain hole. Are there any other ways to run
> the cable? Phil Brown

 

[A Muzi]

John wrote:

> Hello Esteemed Bike Wrenchers,
>
> I am building up a Colnago Master X Light. Things were
> moving along fine until I tried to secure the derailleur
> cable guide to the bottom bracket shell. The screw wont
> fit, as a matter of fact, I can't see any threads in the
> hole. What are the chances the opening is not threaded?
>
> The calipers say the screw is about 5mm, the hole is about
> 3mm . Is there a smaller screw for Italian Frames? Any
> suggestions on how to make this work would be appreciated.
> I can't believe that Ernesto would let a frame go out the
> door unfinished.

You can't believe that? You don't see many Colnagos.

Bianchi used to ship with a sheet metal screw in a 3mm hole
there. Or you could just tap it m5 x 0.8 before you build
the bike. This is not a crisis, just a detail.

--
Andrew Muzi www.yellowjersey.org Open every day since 1
April, 1971

 

[Dan Daniel]

On 3 Jul 2004 18:01:08 -0700, [email protected] (John) wrote:

>Hello Esteemed Bike Wrenchers,
>
>I am building up a Colnago Master X Light. Things were
>moving along fine until I tried to secure the derailleur
>cable guide to the bottom bracket shell. The screw wont
>fit, as a matter of fact, I can't see any threads in the
>hole. What are the chances the opening is not threaded?
>
>The calipers say the screw is about 5mm, the hole is about
>3mm . Is there a smaller screw for Italian Frames? Any
>suggestions on how to make this work would be appreciated.
>I can't believe that Ernesto would let a frame go out the
>door unfinished.
>
>Thanks,
>
>John

A sheet metal screw? Or drill and tap. Doesn't have to be
metric. A 3mm hole is right around a #8 or #6 screw or bolt.

I had a similar problem, and just put a couple of small tabs
of double sided tape on the guide. The cables pretty well
hold the guide in place, and the tape gave enough hold for
proper positioning. This probably won't be good for the
paint under the double stick, but I figure a cable guide
will cover whatever happens.

 

[Qui Si Parla Ca]

jnerges-<< I am building up a Colnago Master X Light. Things
were moving along fine until I tried to secure the
derailleur cable guide to the bottom bracket shell. The
screw wont fit, as a matter of fact, I can't see any threads
in the hole. >><BR><BR>

Colnago uses a screw that looks all the world like a short
wood screw, w/o any threads in the BB shell hole. It'll work
if ya gun it in there but taping the hole is a better idea.

Peter Chisholm Vecchio's Bicicletteria 1833 Pearl St.
Boulder, CO, 80302
(303)440-3535 http://www.vecchios.com "Ruote convenzionali
costruite eccezionalmente bene"

 

[John Thompson]

On 2004-07-04, John <[email protected]> wrote:

> I am building up a Colnago Master X Light. Things were
> moving along fine until I tried to secure the derailleur
> cable guide to the bottom bracket shell. The screw wont
> fit, as a matter of fact, I can't see any threads in the
> hole. What are the chances the opening is not threaded?

If you don't see any threads, it's probably not threaded.

> The calipers say the screw is about 5mm, the hole is about
> 3mm . Is there a smaller screw for Italian Frames?

There's a wide variety of cable guides out there, and not
all of them use screws to fasten in place. Some simply pop
in and use a plastic flange on the guide to hold it.

Leaving the hole unthreaded gives the customer the widest
choice in how to attach their preferred cable guide. It's
only a matter of a couple minutes to run a tap through the
hole to cut some threads.

> Any suggestions on how to make this work would be
> appreciated.

Use a thread gauge to determine the size of the hardware you
intend to use, select a tap of the proper size and cut some
threads in the hole.


> I can't believe that Ernesto would let a frame go out the
> door unfinished.

Traditionally, most European frames were shipped unprepped;
the bike shop was to do the final prep and assembly.
Ernesto may simply be continuing to supply frames in the
traditional manner...

--

-John ([email protected])

 

[John]

Tapping the hole worked like a charm. The Master X is up and
running, what a great ride. And you are right, it is a
gorgeous paint job.

Thanks for you help on this,

John

John Thompson <[email protected]> wrote in message
news:<[email protected]>...
> On 2004-07-04, John <[email protected]> wrote:
>
> > I am building up a Colnago Master X Light. Things were
> > moving along fine until I tried to secure the derailleur
> > cable guide to the bottom bracket shell. The screw wont
> > fit, as a matter of fact, I can't see any threads in the
> > hole. What are the chances the opening is not threaded?
>
> If you don't see any threads, it's probably not threaded.
>
> > The calipers say the screw is about 5mm, the hole is
> > about 3mm . Is there a smaller screw for Italian Frames?
>
> There's a wide variety of cable guides out there, and not
> all of them use screws to fasten in place. Some simply pop
> in and use a plastic flange on the guide to hold it.
>
> Leaving the hole unthreaded gives the customer the widest
> choice in how to attach their preferred cable guide. It's
> only a matter of a couple minutes to run a tap through the
> hole to cut some threads.
>
> > Any suggestions on how to make this work would be
> > appreciated.
>
> Use a thread gauge to determine the size of the hardware
> you intend to use, select a tap of the proper size and cut
> some threads in the hole.
>
>
> > I can't believe that Ernesto would let a frame go out
> > the door unfinished.
>
> Traditionally, most European frames were shipped
> unprepped; the bike shop was to do the final prep and
> assembly. Ernesto may simply be continuing to supply
> frames in the traditional manner...