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Question About Record 8 Speed Rear Derailleurs

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Question About Record 8 Speed Rear Derailleurs

Old 08-26-21, 08:30 AM
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cpsqlrwn
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Question About Record 8 Speed Rear Derailleurs

Having experienced this once, I am familiar with the occurrence of a hairline crack in the upper area of the mounting bolt housing on 8 speed Record rear derailleurs. In 1996 Campy came out with titanium components in the Record group. The rear derailleur, ergo shifters, and certain hub components were included in the first titanium issue. Specific to the rear derailleur, the catalog claimed weight savings and less friction between the moving parts (no mention of the metal fatigue at the mounting bolt housing). Did the introduction of the titanium rear derailleur also eliminate the metal fatigue associated with the hairline crack? Being wary of the crack problem which was fairly common, I was intending to use a Chorus RD. But then I came across this 1996 catalog and I was wondering if the titanium version of the Record RD would totally eliminate that possibility. Thanks for any information.
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Old 08-26-21, 10:09 AM
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I had an 8 speed Record RD w/ Ti hardware crack at the upper pivot / mounting bolt area. But I have a first generation, all alloy Record 9 Speed RD (Ti hardware) that is still going strong. Maybe you can look into whether those 9 speed RDs will work with an 8 speed set up?

Last edited by gearbasher; 08-26-21 at 11:36 AM.
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Old 08-26-21, 01:35 PM
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Originally Posted by gearbasher View Post
I had an 8 speed Record RD w/ Ti hardware crack at the upper pivot / mounting bolt area. But I have a first generation, all alloy Record 9 Speed RD (Ti hardware) that is still going strong. Maybe you can look into whether those 9 speed RDs will work with an 8 speed set up?
Thanks for the response. Does anyone out there have any experience or knowledge concerning whether a Campy Record 9-speed rear derailleur can function properly in a Record 8-speed drive train? What would the setup or adjustment issues be for the derailleur in that setup?
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Old 08-26-21, 01:45 PM
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I had the '96 8 speed Chorus group. The titanium bolt was the only difference between it and Record. And no I don't believe they were compatible with 9 speed so a Chorus RD is your best choice.
Far and away the best road group I've ever owned, it never missed a shift over thousands of kms.
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Old 08-26-21, 01:51 PM
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1991 Campy Record RD With Cracked Upper Pivot

Originally Posted by cpsqlrwn View Post
Having experienced this once, I am familiar with the occurrence of a hairline crack in the upper area of the mounting bolt housing on 8 speed Record rear derailleurs. Specific to the rear derailleur, the catalog claimed weight savings and less friction between the moving parts (no mention of the metal fatigue at the mounting bolt housing). Did the introduction of the titanium rear derailleur also eliminate the metal fatigue associated with the hairline crack? Being wary of the crack problem which was fairly common....
Bummed OUT!

I had an almost new 1991 Lemond TeamZ with an 8 speed Chorus gruppo that I sold. When I was packing it up to ship, I noticed a more than hair line crack across the top of the upper pivot on the RD!

It was in a position that was concealed by the shadows and reflections.

I sprung for an NOS one that I found on eBay because I couldn't sell a bike in that condition!

There is no excuse for this kind of crack to happen! POOR design and workmanship!



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Old 08-26-21, 05:30 PM
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Originally Posted by clubman View Post
I had the '96 8 speed Chorus group. The titanium bolt was the only difference between it and Record. And no I don't believe they were compatible with 9 speed so a Chorus RD is your best choice.
Far and away the best road group I've ever owned, it never missed a shift over thousands of kms.
9 is the spacing when Shimano and Campy converged but they both diverged from their own 8s and 10s I think.

...great thing about Campy 8s and 9s ergo is that they were vertically compatible with every component base to premium without a hitch.
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Old 08-26-21, 07:37 PM
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The split knuckles appear to be the result of an over-tight press-fitted sleeve/bushing, resulting in creep-yield failure of the knuckle.

Fatigue would be the cause if there were no bushing pressed into the knuckle.

It's very similar to how Campagnolo's pulleys would split, due to their prolonged tension stress of being a tight fit on the busing.

Unfortunately, both aluminum and plastic are much, much more vulnerable to creep-yield failure than is steel.

All of the 8 and 9s derailers having a conventional B-tension screw are interchangeable. With the introduction of their C9 chain, Campagnolo recommended it's use with the earlier 8s drivetrain.

Last edited by dddd; 08-26-21 at 07:40 PM.
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Old 08-27-21, 09:04 AM
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Originally Posted by dddd View Post
The split knuckles appear to be the result of an over-tight press-fitted sleeve/bushing, resulting in creep-yield failure of the knuckle.

Fatigue would be the cause if there were no bushing pressed into the knuckle.

It's very similar to how Campagnolo's pulleys would split, due to their prolonged tension stress of being a tight fit on the busing.

Unfortunately, both aluminum and plastic are much, much more vulnerable to creep-yield failure than is steel.

All of the 8 and 9s derailers having a conventional B-tension screw are interchangeable. With the introduction of their C9 chain, Campagnolo recommended it's use with the earlier 8s drivetrain.
Agreed with @dddd, Campagnolo 9 speed RDs with a conventional B-screw have the same pull ratio as 8-speed. I'm using a 9 speed racing triple RD (conventional B-screw) with 8 speed Ergos and they play together perfectly.

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Old 08-27-21, 09:11 AM
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Yes
P1050217 on Flickr

and yes
[url=https://flic.kr/p/2mdUwgw]P1050186[/urll] on Flickr
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Old 08-27-21, 04:43 PM
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Thanks for all the responses and great information. I'll either go with an 8 speed Chorus RD or a pre 2000 9-speed Chorus or Record RD. I am assuming the 9-speed Record RD did not have the same crack issue as the 8-speed Record RD. If someone could absolutely confirm that the 9-speed Record is ok with regard to the upper mount bolt housing cracks, I would appreciate it. Otherwise I'll stick with Chorus.
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Old 08-28-21, 12:03 PM
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I can confirm that a 9 speed derailleur can work with an 8 speed setup. When I ruined my Avanti 8 speed, I was offered a cheap 9 speed Daytona RD, and decided to take the chance. I had no problems with that setup.
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Old 08-28-21, 07:46 PM
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Originally Posted by Highmass View Post
I can confirm that a 9 speed derailleur can work with an 8 speed setup. When I ruined my Avanti 8 speed, I was offered a cheap 9 speed Daytona RD, and decided to take the chance. I had no problems with that setup.
Thank you for your response. I am not concerned with whether a 9-speed Campy RD will work with 8-speed Campy ergo shifters. Pre 2001 9-speed Campy RDs will definitely work with Campy 8-speed drive trains. My only concern at this point is confirming whether pre 2001 Record 9-speed RDs have the same tendency tp produce hairline cracks as the 8-speed Record RDs. Thank you.
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Old 08-29-21, 01:01 AM
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Originally Posted by cpsqlrwn View Post
Thank you for your response. I am not concerned with whether a 9-speed Campy RD will work with 8-speed Campy ergo shifters. Pre 2001 9-speed Campy RDs will definitely work with Campy 8-speed drive trains. My only concern at this point is confirming whether pre 2001 Record 9-speed RDs have the same tendency tp produce hairline cracks as the 8-speed Record RDs. Thank you.
I would assume so.

The mounting bolt for my 8-speed Chorus RD was tweaked (likely from a soft fall) and so I paid about $11 for a complete but cracked 9-speed Record RD on the bay, and harvested the bolt.

I expect the type of fall would make a difference, and this design doesn't handle certain impacts well.
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