Campagnolo derailleur mounting bolt?

What is broken on your "old" derailleur?

Was your broken derailleur used on an 8-/9-/10/11-speed INDEXED drivetrain or a FRICTION drivetrain?

What is the inner diameter of the mounting bolt's sleeve of the "new" (1987) derailleur?

Hi,

the previous broken one was similar to this:
VeloBase.com - View Component Detail

It has a 10mm bolt with surrounding spring mounting and a broken frame. It was most likely used with synchro or friction levers.

And the diameter of the hole in the current project is 11mm

Here's the picture of the bolt needed(second pic from right):
VeloBase.com - View Component Detail

It seems that the bolt might be totally loose without any springs, 3rd pic from left. So most likely all I need is the bolt, but where to find one?

Thanks

fillarji said:

the previous broken one was similar to this:
VeloBase.com - View Component Detail

It has a 10mm bolt with surrounding spring mounting and a broken frame. It was most likely used with synchro or friction levers.

And the diameter of the hole in the current project is 11mm

Here's the picture of the bolt needed(second pic from right):
VeloBase.com - View Component Detail

It seems that the bolt might be totally loose without any springs, 3rd pic from left. So most likely all I need is the bolt, but where to find one?

I understand/(understood) the BOLT which you have, but I don't know what the dimensions are ...

What are the inner dimensions of the hole into which the bolt goes -- length & inner diameter?

If you need an intermediate collar to act as a bushing, then go to a hobby/craft store and buy some BRASS STOCK ... widths vary ... in the States, I think the standard thickness is/(was?) 1/64" (?) and the length is 12". Brass 'sheet' which is thinner may also be available.

FYI. If you aren't restoring a bike, then you can substitute almost any contemporary rear derailleur made by almost anyone.

AFAIK, the older Campagnolo rear derailleurs do not have a spring mechansim associated with the derailleur hanger bolt ...

The hanger bolt hole in the chorus derailleur is 11mm wide and about 20mm deep.

I took a hanger bolt from a nuovo record derailleur and a campagnolo 980 derailleur, both were the proper width, but they were too long i.e were sticking too far out when fitted.

So now at least I know that most older campa use that wide bolt, now all I need is the proper lenght. Any idea where to look?

I just would like to restore the derailleur into working order...

Thanks

fillarji said:

The hanger bolt hole in the chorus derailleur is 11mm wide and about 20mm deep.

I took a hanger bolt from a nuovo record derailleur and a campagnolo 980 derailleur, both were the proper width, but they were too long i.e were sticking too far out when fitted.

So now at least I know that most older campa use that wide bolt, now all I need is the proper lenght. Any idea where to look?

FWIW. I measured a post Nuovo Record, pre horizontal parallelogram, Campagnolo derailleur's bolt as being about 35mm (tip-to-tip) -- 5mm threaded, 27mm core, 3mm bolt head ... the "shroud" for the bolt is 27mm wide.

Regardless, I think that you can put a spacer between the derailleur and the derailleur hanger ... OR, place the spacer OUTBOARD between the "shroud" and the head of the bolt ...

For the outboard spacer, you could use some 7/16" ID (or, 11mm ID) copper tubing -- there should be minimum stress on this spacer if it is mounted outboard.

A current Shimano bolt is 32mm long; but, the diameter of the core of the bolt is probably different.

alfeng said:

Regardless, I think that you can put a spacer between the derailleur and the derailleur hanger ... OR, place the spacer OUTBOARD between the "shroud" and the head of the bolt ...

For the outboard spacer, you could use some 7/16" ID (or, 11mm ID) copper tubing -- there should be minimum stress on this spacer if it is mounted outboard.

Yes that seems the best way to go currently. I would prefer putting the spacers outboard, between the bolts cap and outer end of derailleur. That way the derailleur will be mounted the way it was originally...

11mm ID means inner diameter? How thick should the copper tubing be, is 1-2mm good to go?
I live in Finland so is the best way to find copper tubing in a hardware store and just cut it with a saw?

Thanks again

fillarji said:

Yes that seems the best way to go currently. I would prefer putting the spacers outboard, between the bolts cap and outer end of derailleur. That way the derailleur will be mounted the way it was originally...

11mm ID means inner diameter? How thick should the copper tubing be, is 1-2mm good to go?
I live in Finland so is the best way to find copper tubing in a hardware store and just cut it with a saw?

Yes, sorry for not expanding the abbreviation -- "ID" is the abbreviation for "inner diameter" ...

I don't think you will have an option with regard to how thick the tubing will be ... if copper tubing which is ~2mm thick is available, then that's what you should get because it will nest in the shroud's recess, but it will probably be thinner.

To cut the tubing, a TUBING CUTTER would be best, but you can simply take a sharp knife and ROLL the knife across tubing ... that is, put the tubing on a "work surface" ...
[INDENT]Then, place the edge of the blade perpendicular to the tubing's axis, and then, roll the tubing beneath the knife blade and thereby score the outer surface of the tubing. Keep rolling the tubing/knife until you have scored at least 3/4 of the way through ...

The deeper you score the tubing, the easier it will be separate the pieces.

Using a knife will be tedious, but a tubing cutter probably cannot cut a "spacer" that is shorter than ~5mm.
[/INDENT]Brass tubing would be more robust ... you would still use a tubing cutter or sharp knife.

If you made a steel collar/spacer, then you would need to use a saw to cut the tubing.

If (initial) appearance doesn't matter OR particularly if the difference is only a 2mm then you could make the collar/spacer from an old 14g spoke by coiling it around the bolt's core and then adjusting the length/etc., accordingly.

fillarji said:

Hello,

I have bought campagnolo chorus derailleur with missing mounting bolt. I bought it because I though I could use my other campagnolo mounting bolt from a broken derailleur. Can anyone advice what kind of mouting bolt is needed and where I can find one on the web?
My bolt from broken derailleur(record) doesn't fill the hole totally, so there is about 1-2mm space...

Is there supposed to be any springs in the mounting bolt hole, because there are currently none...

here's the derailleur:
Campagnolo Chorus Schaltwerk,erste Ausführung ab 1987 bei eBay.de: Fahrradteile (endet 14.04.10 18:48:35 MESZ)

Thanks alot

Called 'A-B' Chorus and made from the mid 80s thru about 1989 or so. Unique to this rear derailleur and the only way to find a new one is to find another RD of like design, in other words another A-B RD.