Hi I am looking to convert my 2007 era Campag Veloce drive train (sq taper) from a double to a triple for my impending trip to the Alps this summer for the La Marmotte , I did some of the hills in the area last summer on a compact 50/34 with 12-25 cassette, and just about survived, but feel the triple would make it easier to spin up the mountains and help my dodgy knee. So, I want to find out what needs changing. I have identified the following:
-Chain rings/crankset obviously!
-wider "triple" Bottom bracket (how do I determine what kind of thread without taking it apart?)
- Rear derailleur (either med or long cage depending on cassette choice)
New chain & cassette, either 12/26 or 13-29 probably

What I am definitely unclear about, is the front mech. I have a mech designed for a 53/39 chainset currently, but use it with a compact chainset 50/34 and it works well enough, but I want to get 53/42/30.

Additionally do I need to change either of the Ergo shifters to cope with an increase in shifting range or are they built for any combination of mechs?

Cheers

Anything that I have forgotten?