So... I've been meaning to post my findings relating specifically to the Colnago C60 and the new Campagnolo rear derailleurs. I used my own C60 to test things out and measure the details. It's a size 59 Traditional.
Quick Summary and Conclusions:
1) The Colnago C60 rear derailleur hanger is within the Campagnolo Specifications.
2) I was able to adjust it perfectly for all cassette ranges the derailleur is designed for, tested on 11/23, 12/25, 12/27, 11/29 cassettes. In all cases I could adjust the derailleur so that the upper pulley was within 5mm of the sprocket teeth. In fact, on the 11/29 cassette I had to back off the tension otherwise the pulley was too close to the largest sprocket. Might be the same on the 11/27 although I didn't specifically ride with this cassette yet... but thoroughly tested the extreme ranges using 11/29 and 11/23 cassettes to verify things.
3) The only modification I made was to move the tension spring for the cage from the middle hole (factory setting) to the highest tension hole.
Here's a pic of the highest tension hole (highlighted in white) that I moved the spring arm to...
Next I wanted to satisfy myself that the Colnago C60 derailleur hanger is in fact within Campagnolo's specifications for derailleur hangers. Note that Colnago definitely made use of the maximum boundaries of the guideline choosing a 28mm distance from the axle center to the derailleur bolt center, and is right on the limit of the 35 degree tab spec. This makes for relatively easy wheel changes compared to some other hangers....
Campagnolo Specs...
Colnago C60 Hanger Specs... as close as I could measure, using actual hanger and frame dimensions. Where there might have been some question as to the accuracy of my measurements, I erred to the side that would throw it out of specification rather than try to fudge it to "make it fit".
Chain length was established first... I found that a chain on the longer side was better than one on the shorter side of the specs. As such, I can just pass (barely) a 10mm allen key between the chain and the lower portion of the cage surrounding the lower pulley when the chain is positioned on the smaller chainring (36 in this case) and the smallest sprocket (11 in this case).
Ok... next up... pics of the install showing the distance from the largest sprocket to the upper pulley. I did this exercise for the following cassettes...(11/23, 12/25, 12/27, 11/29)....just to make sure that they all would work. The pics below just show the 11/23 cassette.
Below are progressive closeups up of the distance between the teeth of the largest sprocket on the cassette and the upper pulley of the derailleur when the chain is on the largest sprocket and the smallest chainring up front. In this case, the chain rings are 36/52 and the cassette is the smallest, and most likely to create difficulty with this adjustment, that Campy currently makes... 11/23.
Firstly, an overview of the setup (36/52 chainrings and 11/23 Cassette)...
Next... a little closer, but same setup...
And finally... super closeup so you can really get a feel for just how close the pulley is to the sprocket...
The above pics just show the 11/23 cassette as it requires the derailleur to be closer than any of the other cassettes. In fact, when using the 11/29 cassette I have to back off the tension otherwise the upper pulley gets too close to the sprocket and causes binding and noise.
So, there you have it. I also set it up initially with no change in placement of the tension spring in the derailleur, and while it was probably acceptable, I could not get it quite as close as I show in the pictures above without the change, but it certainly would have been usable. In any case, it certainly wasn't anywhere close to an inch away from the sprocket... maybe more like 10mm rather than the 5-7mm the guidelines would like it to be. And even though the Campy docs state that for the 11/23 cassette, it may not be possible to get the gap smaller than 7mm, I was able to get it significantly smaller than that, as the pics indicate. Certainly no more than 5mm.
I think the big takeaway from this, for me at least, is that the derailleur hanger on the C60 is within Campagnolo's spec and that with proper install things work as they should. And given what the previous poster @jwfinesse just showed... that there may have been a running change in the toothed wheel that adjusts the cage tension, I suspect that it will be even easier to achieve the proper tension here in the future, without even having to move the spring to the high tension hole like I did here.