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 Post subject: Re: Re:
PostPosted: Thu Aug 16, 2018 10:46 pm 
MacRetro rider
MacRetro rider
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Joined: Thu Jul 30, 2009 4:56 pm
Posts: 2849
Location: A Fifer furth o' the Kingdom
mattr wrote:
old_coyote_pedaller wrote:
Wouldn't tightening the B-tension screw not rotate the mech down and backwards therefore give the mech cage more clearance to cogs?
Don't think campag mechs of this vintage have b-tension adjustment. Just a fixed tab.


old_coyote_pedaller wrote:
so no idea if Campag is different.



So Campag is different, at least that age of mech anyway. Think I'll be sticking to Shimano. :mrgreen:


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 Post subject: Re:
PostPosted: Fri Aug 17, 2018 8:17 am 
Old School Hero
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Joined: Wed Oct 21, 2009 1:51 pm
Posts: 164
Location: Kingston
It is possible to adjust the spring tension in a Super Record derailleur. There are 3 positions you can set it to.

Position 1:
ImageIMG_20180817_074958377 by cromoman, on Flickr

Position 2:
ImageIMG_20180817_075815797 by cromoman, on Flickr

Position 3:
ImageIMG_20180817_074457917 by cromoman, on Flickr

The more tension you have (position 3), the further the top jockey wheel will sit from the freewheel. Less tension (position 1) will reduce the capacity of chain that is taken up.

To change the tension, first remove the little screw:
ImageIMG_20180817_074559994 by cromoman, on Flickr

Be sure to rotate the parallelogram clockwise while you do it to remove the tension otherwise you'll damage the screw.

Then undo the bolt that holds the parallelogram to the cage.

You'll see that the cage has 2 spring holes, and the sleeve also has 2 holes:
ImageIMG_20180817_074654058 by cromoman, on Flickr

ImageIMG_20180817_074734495 by cromoman, on Flickr

This gives you 4 possible combinations, but 2 will give the same tension, hence 3 positions.

As mentioned, check the chain length and wheel position first.

In my experience, if you set them up to work with big sprockets and a big difference in chainrings (position 3), then they will be fine on the larger sprockets but a little bit fluffy changing between the smaller sprockets.


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 Post subject: Re:
PostPosted: Fri Aug 17, 2018 1:40 pm 
Retro Guru

Joined: Tue Feb 23, 2010 1:56 pm
Posts: 1059
Location: West Yorkshire
Brilliant cromoman! I'd forgotten all about those holes. Might have to try that on mine which is being pushed a bit further than the OP's as I'm asking it to work with 26 or even 28 tooth sprockets.
Mark.


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PostPosted: Fri Aug 17, 2018 2:12 pm 
Retro Guru
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Joined: Fri Jul 29, 2016 11:31 am
Posts: 305
Location: North Kent Coast UK
Yes brilliant cromoman! I was just going to suggest that but wouldn't have been able to go into such superb detail.

I had to do exactly this on a Nuovo record recently using my very unreliable memory as I hadn't done it in at least 25 years and had to work it out as I went along, I shall be saving this tutorial for the next time I need to do it, only this time I'll be able to do it with less swearing and less greasy finger marks on my forehead from all the head scratching.


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