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Horochar

07-30-18 12:08 PM

Which Campy Derailleur?

Campy people: I can’t figure out if this 7 speed RD is C-Record or Athena. (Pretty sure the crankset is C-Record.) Thanks.https://cimg7.ibsrv.net/gimg/bikefor...63cc60eb0.jpeg https://cimg6.ibsrv.net/gimg/bikefor...04e0c75a7.jpeg

Horochar

07-30-18 12:09 PM

FWIW, on a 1985 Masi Nueva Strada.

fietsbob

07-30-18 12:24 PM

Its Chorus , A/B ..perhaps sneaking around Sun Tours Slant parallelogram patent..
since you unscrewed the bolts and use it as you have shown for straight blocks ..

Angled for wider range gear ..
I used mine that way with single chain ring & 14-34t freewheel..

....

Horochar

07-30-18 12:28 PM

LOL. None of the above! Thanks.

Chombi1

07-30-18 02:10 PM

1st Gen Chorus RD and C Record crank......
Good you have the Chorus RD on the bike, rather than the C Record RD, as it will shift so much better with its double slant parallelogram design.....

Grand Bois

07-30-18 02:41 PM

Quote:

Originally Posted by Chombi1 (Post 20478401)

1st Gen Chorus RD and C Record crank......
Good you have the Chorus RD on the bike, rather than the C Record RD, as it will shift so much better with its double slant parallelogram design.....

That's one I haven't heard before. What is meant by double slant parallelogram?

Chombi1

07-30-18 07:42 PM

Quote:

Originally Posted by Grand Bois (Post 20478459)

That's one I haven't heard before. What is meant by double slant parallelogram?

Sorry maybe I mistated.... I think "Offset top pivot/Slant Parallelogram" might be the proper description...... "Slant" meaning the angle the arms go to follow the cogs closely. While the top pivot is "Offset" from the axis of the bottom pivot....

P!N20

07-30-18 08:01 PM

There's a bit about them on the always excellent Retrogrouch blog: The Retrogrouch: Campagnolo Derailleurs: Evolutionary Dead Ends

Also, they don't work with 8 speed cassettes. Just saying.

dddd	07-30-18 11:30 PM

I like the intermediate or transitional design of the Athena and Xenon Synchro-7 derailers, and that they index really well using Shimano 9s chain.

Grand Bois

07-31-18 08:25 AM

Quote:

Originally Posted by Chombi1 (Post 20479028)

The only way you can have a slant parallelogram is if you have an "offset top pivot".

fietsbob

07-31-18 08:49 AM

BITD , [USA, 80's] Bikes , with premium brand steel frames were assembled in LBS
with group of customer's choice..

so buying used bikes now you get other people's choices made at the time..

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