For reasons I won't bore you with, I'd like to try a half-step and granny gearing system. I'm willing to entertain suggestions that it's ill-advised, but I'd like to try it for myself all the same, and I have most of the parts I need to get started.
Likely gearing will be 45-42-granny at the front, and either 11-12-14-16-18-21-24-28 or 12-14-16-18-21-24-28-32 (eight of nine) at the rear.
Questions:
What front derailleur would you choose, and why?
Given the above, what size granny would you shoot for?
Shifters will be either older Campag Ergos, Shimano barcons, or downtube levers, so front indexing isn't an issue.
Thanks,
James Thomson
Any road FD, adjusted well, will shift fine with the shifters you mentioned.