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PostPosted: Wed Oct 27, 2010 10:27 pm 
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Location: High On A Hill
Hi. Just started sorting out my latest build, 90's Merckx Corsa Extra, and would like to use some C-Record/Chorus bits with a 10 speed drivetrain.

My question is can you use a Campag 8 speed Rear Mech with a 10 speed cassette ?

The 8 speed Rear Mechs look much nicer than the later 9/10 speed models, particularly the C-Record Rear Mech.

Any comments much appreciated


Thanks


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PostPosted: Thu Oct 28, 2010 12:20 am 
Dirt Disciple

Joined: Mon Jul 19, 2010 1:30 pm
Posts: 10
I expect you'd have shifting issues with that combination, 10sp shifter n'all. (Although I've never tried it with Campag.)

I've just built a Corsa Extra. New type Campag freehub (same as you will have), new 9sp rings, 9sp cassette and chain working with the old mechs, shifters and cranks.

My solution was to re-space the cassette (spacer kit) with 1 ring removed. Shifts perfectly with a 8sp Record Mech and 8sp Chorus ergoshifter.

8sp bike basically. (but with new drivetrain I can easily replace.)


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PostPosted: Thu Oct 28, 2010 7:27 am 
Retro Guru

Joined: Mon Jul 28, 2008 10:29 pm
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10 speed and 8 speed Campag mechs pull different amounts of cable so if it works, it may not work well, or for long as the parts wear.


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PostPosted: Fri Oct 29, 2010 8:26 am 
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Thanks for the replies.

Because I want a 10 speed drivetrain it seems sensible to use a 10 speed rear mech and get good shifting, rather than go for more retro/classic looks and compromised performance.


8) 8) 8)


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PostPosted: Sat Oct 30, 2010 5:47 pm 
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Joined: Mon Feb 01, 2010 8:57 pm
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8 speed is 3.5mm to move it 6.03mm vs 10 speed is 2.8mm to move the mech 4.8mm so in fact a 10 speed shifter should move an 8 speed mech 4.8mm if my sums are correct! www.highpath.net is a good source for fixes to correct cable-pull ratios


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PostPosted: Sun Oct 31, 2010 9:25 am 
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Thanks monty dog for the Highpath link.

They've got some clever solutions for mixed Shimano/Campagnolo drivetrains.


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 Post subject: 8 speed conversion
PostPosted: Tue Nov 02, 2010 2:34 pm 
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Joined: Wed Nov 04, 2009 9:57 pm
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isnt the cable pull controlled by the levers not the rear mech ????

as long as the mech moves the full length of the number of sprockets you should be able to use any rear mech

on my cross bike have 9 speed campag ergos, 9 speed shimano cassette,9 speed campag rear mech. with no mods

on another have the same but with a shimano 105 10 speed rear mech with no mods

have a vintage Vitus X bike with shimano 7 speed STI with a conventional 7 speed screw on free wheel and an old 600 ex rear mech with no mods.


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 Post subject: Re: 8 speed conversion
PostPosted: Tue Nov 02, 2010 3:14 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 8212
Location: New Forest, UK
orbeas wrote:
isnt the cable pull controlled by the levers not the rear mech ????

as long as the mech moves the full length of the number of sprockets you should be able to use any rear mech

on my cross bike have 9 speed campag ergos, 9 speed shimano cassette,9 speed campag rear mech. with no mods

on another have the same but with a shimano 105 10 speed rear mech with no mods

have a vintage Vitus X bike with shimano 7 speed STI with a conventional 7 speed screw on free wheel and an old 600 ex rear mech with no mods.


The problem is a different leverage in the mech, so Campag mechs move less far for a given cable pull than Shimano. Post-2001 mechs move even less, which makes the shifting less finicky.


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PostPosted: Thu Feb 17, 2011 1:55 am 
Dirt Disciple

Joined: Tue Feb 08, 2011 11:59 pm
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Location: PLYMOUTH
Apologises for dragging up an old thread.

It is a question about your Corsa Extra's being 9 speed, and their original rear drop out width.

I have a Corsa Extra (circ 1988/89) and I am moving to 8 speed, I brought it second hand, with a 7 speed SACH screw on (126mm dropout). When I move to campag 8 speed Hub (130mm dropout), will I need to cold form or snap open the frame, or did it start life as with a 130mm rear drop out width?


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PostPosted: Thu Feb 17, 2011 9:30 am 
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Joined: Tue Jun 03, 2008 4:31 pm
Posts: 741
It will be fine. I have run 9, 8 and ancient record rear mechs with 10 speed shifters.
in many case the theory won't match the reality


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