For Feuertänzerin, I plan on using Athena for the chainset shifters and front deraileur, with Potenza for the rear derailleur and cassette. This is because I want to use the 11-32 cassette that Potenza has available.
FYI ...
I do NOT know what the dimensions are of the Campagnolo Potenza rear derailleur, but ...
I have found that I could use an
11-34 Shimano Cassette with an intermediate-length cage
2001-2008 Campagnolo rear derailleur ...
I found that the long cage was actually problematic depending on who much-or-little chain slack was present because of the variable geometry of the rear derailleur's upper jockey wheel ... that is, I guess I was running a slightly longer chain than was necessary with the long cage rear derailleur.
With the
1998-2000 Campagnolo long cage (
which are closer in length to the recent middle/intermediate length cages) rear derailleurs, I can run an
11-36.Shimano Cassette.
If you need more chain capacity then you can easily fit a 13t pulley in the lower pulley wheel position ...
I think that the "long" cage 1998-2000 rear derailleur can possibly handle a 15t pulley wheel!
Now, the caveat with regard to how large a Cog can be accommodated by the rear derailleur is the length of the frame's derailleur hanger AND (again) how much-or-little slack the chain has.
That's a long way of saying that because YOU already have Campagnolo derailleurs, you could see whether or not you need to pony up for a Potenza rear derailleur vs. a middle-length-cage 2001-2008 Campagnolo rear derailleur.OR the slightly older-and-porkier 1998-2000 model.
As you probably know, the "classic" Campagnolo rear dropout which essentially had
zero drop. Consequently, when I wanted to use an 11-34 Cassette I opted for a Shimano XT (
GS ... middle length cage) rear derailleur
(off hand, I don't recall trying a 1998-2000 rear derailleur).
The Potenza's specs are probably conservative AND my impression is that the "largest Cog" for ALL Campagnolo is based on fitting the derailleur on a bike whose frame has the "classic" Campagnolo rear dropout.
BTW. I am guessing that the length of the Potenza parallelogram is close-to-or-the-same-as the length of the parallelogram on the 1998-2000 parallelograms.
If you get a Potenza and find that it can barely handle a 32t Cog and you want to use a larger Cog, then you can swap the 11t upper jockey wheel with a 10t pulley wheel.
The 2009-2014 (?) Campagnolo rear derailleurs have a shorter parallelogram which DOES limit the largest Cog size closer to factory specs ...
One of these days, I will substitute a Shimano B-screw "plate" for the non-adjustable plate which 2009-and-beyond Campagnolo rear derailleurs have to see if one can be made to work with a 32t-to-34t largest Cog on a frame with a "standard" vertical rear dropout..