Thanks for the info but I am not sold! The rear D is a spring. The position of that spring is set by the index. All other variables are the same (position on bike by Hanger, position to axle etc). I will play with a campy d when I am setting up new bike in a few weeks. Will let you know.
I'll be interested in hearing how it goes for you ..hope it works for you nz.
I will tell you that one variable you aren't considering that is important is the derailleur action itself. The pivot of the two drailleurs are different, therefore the derailleurs will move a slightly different distance, given identical amount of cable pulls. It's a trigonometry thing!
Here's veloparts email: <VeloPartsInc@hotmail.com>
Here's what he said:
If you want to go to the effort of making the proper adapter you can get just about any combination imaginable to work. I make an adapter for Ergo shifters and Shimano drivetrain, just because I use that combo on my own bikes. There is not enough demand for other variations to justify their development.
Here's what wheelsmfg said to me:
Still working on it. Will have more solid answers in a month or two. I have been able to get everything to work, just not sure if I really like the way they work and am waiting for a little warmer weather to test ride the things.
I personally am not interested (at this time) in mixing systems, at least rear derailleurs and/or shifters. I think Superlite has a good point about that. I'm just interested in if it can work and if it's an option in any future builds I might do.