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Broke clamp pivot on Campy Avanti front derailleur

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Broke clamp pivot on Campy Avanti front derailleur

Old 06-27-20, 03:41 PM
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dmw010
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Broke clamp pivot on Campy Avanti front derailleur

I made a mistake and overtightened the seat tube clamp on a 1997 Campy Avanti front derailleur. It snapped the pin in the clamp pivot. The clamp is integral to the derailleur, so I canít replace it. I got the pieces of the pin out. See photos of clamp and pin.

Iím rebuilding a low-end 1997 Bianchi with its original parts, so Iíd love to repair the derailleur. Any suggestions for sourcing a replacement pin?

Or anyone got the same derailleur they donít need?


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Old 06-27-20, 04:29 PM
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RGMN
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Find a spring pin that fits
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Old 06-27-20, 04:35 PM
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Originally Posted by RGMN View Post
Find a spring pin that fits
Thanks, thatís a helpful link. Iíll measure the pin diameter with calipers and see what I can find.
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Old 06-27-20, 04:37 PM
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It's just the pin that broke; the clamp and derailleur body are intact? You shoukld be able to replace the pin with a piece of steel rod or even a nail. I used a finishing nail to replace the pin on a vintage Huret Jubilee front derailleur.
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Old 06-27-20, 04:58 PM
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Originally Posted by JohnDThompson View Post
It's just the pin that broke; the clamp and derailleur body are intact? You shoukld be able to replace the pin with a piece of steel rod or even a nail. I used a finishing nail to replace the pin on a vintage Huret Jubilee front derailleur.
Yes, the clamp and the rest of the derailleur are fine.

Its a little tough to accurately measure the pin fragments (they got a bit deformed), but looks like about 2.5mm diameter and 14.5mm long.
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Old 06-27-20, 05:11 PM
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Originally Posted by dmw010 View Post
Its a little tough to accurately measure the pin fragments (they got a bit deformed), but looks like about 2.5mm diameter and 14.5mm long.
I'd take the clamp piece to the hardware store and test-fit a bunch of steel rods, nails, etc. to find the best fit, and buy that one.
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Old 06-27-20, 05:18 PM
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Iíve discovered that the actual part is a hinge roll pin, and you can actually get a Campy replacement:

https://www.modernbike.com/campagnol...-roll-pin-each

Just need to confirm itís the right part for this specific derailleur. But that would save a lot of time and effort!
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Old 06-27-20, 05:18 PM
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They are also called roll pins. The fit is not really critical as long as you can clamp the derailleur securely. You could even use a nut and bolt or a piece of brass tubing and flare out the ends to secure it.
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Old 06-27-20, 05:19 PM
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Originally Posted by dsbrantjr View Post
They are also called roll pins. The fit is not really critical as long as you can clamp the derailleur securely. You could even use a nut and bolt or a piece of brass tubing and flare out the ends to secure it.
Thanks, I just discovered what the part was called as you were posting this!
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Old 06-27-20, 05:34 PM
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Once you get the new part, go easy on the clamping screw, you just need to keep the derailleur from moving; gorilla force is not needed. Is the clamp the correct size for the tube? It looks from the photo like it might be too small.
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Old 06-27-20, 05:37 PM
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Originally Posted by dsbrantjr View Post
Once you get the new part, go easy on the clamping screw, you just need to keep the derailleur from moving; gorilla force is not needed. Is the clamp the correct size for the tube? It looks from the photo like it might be too small.
Yes, clamp is correct - itís original to the bike. And thanks for the warning. I was actually using a torque wrench but clearly had it set too high and wasnít paying attention.
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Old 07-09-20, 03:40 PM
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Hi all!

After a brief delay, I have a new hinge roll pin. Now the question is: how do I install it? It doesn’t just slide in, so it’s going to require some force and/or lubrication. Do I have to compress the roll somehow to insert it? Also not sure if the orientation of the “roll” (clockwise or counter-clockwise) is important. I don’t want to screw it up (again), so I’m returning to the braintrust for advice.
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Old 07-09-20, 04:20 PM
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Roll pins? they are flat strips rolled up, leaving a lengthways gap. so are forced in closing that gap somewhat
they got spring temper heat treated.
the springiness keeps them tight..
that should not need much force or it will possibly crack the hole in the aluminum.

perhaps file it down a little bit, to only be a hundredth ( 0.01~0,015 ) oversize..
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Old 07-09-20, 04:23 PM
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Originally Posted by fietsbob View Post
Roll pins? they are flat strips rolled up, leaving a lengthways gap. so are forced in closing that gap somewhat they got spring temper heat treated.
the springiness keeps them tight..
that should not need much force or it will possibly crack the hole in the aluminum.

perhaps file it down a little bit, to only be a hundredth ( 0.01~0,015 ) oversize..
The pin is actually more like a piece of metal rolled up over itself, like a spring. I can see a couple of layers of metal.
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Old 07-09-20, 07:05 PM
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IF, the pin is the rightsize but has a sharp square edge where you want to insert it into the derailleur I'd chamfer that edge a bit to help guide it into t he derailleur.

Cheers
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Old 07-11-20, 04:13 PM
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dmw010
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Just wanted to let everyone know the derailleur is repaired and reinstalled. I really appreciate all the advice. I haven’t been a regular reader or participant in these forums for many years, but it’s still a great resource!
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