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@user75204 thanks very much for the replies, forgot to mention the wider bb, that's the one thing I was aware of.
It's for a touring bike so feels like a triple set-up would be appropriate, but just working out how best to source the parts if going that route. A compact might be enough in reality.
Useful to know about rear cog limitations with a medium reach mech. After more Googling it appears 1992 thru 2008, all ERGO were double and triple :)
jambon-
The left ergo itself has lots of tiny shifts, not just 2 or 3 positions.
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Campagnolo website is pretty good for technical and user manuals for all sorts of groupsets. I'm not sure if they go that far back, but worth a look. Retrobike used to archive a lot of Campagnolo catalogues too that might be worth a look
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How many gears and what colour group? Athena 11 is decent value and you'll find parts in either black or silver.
Eeyorecore
ghostface
Thankshallots
You can use a medium cage, tho a long reach would likely work better. Just make sure there is enough chain length in the setup to allow a big / big combo if you happen to shift to that at some point. What cassette gearing will u use? Some say a 29 will work with a medium cage in this setup tho i havent tried.