Join Date: Jul 2000
Bikes: 1959 Capo; 1980 Peugeot PKN-10; 1981 Bianchi; 1988 Schwinn KOM-10;
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Avoid indexed shifting in front. It eliminates or at least greatly compromises your ability to feather the cage to avoid chain rub, and it restricts your derailleur choices.
You need to worry about bottom-pull versus top-pull routing of your front derailleur cable, about clamp-on versus braze-on mounting, about clamp diameter (if clamp-on), and about cage geometry (bottom edge curvature and height difference between inner and outer faces, both of which are functions of the chainring sizes it is designed to accommodate).
"Early to bed, early to rise. Work like hell, and advertise." -- George Stahlman
Capo [dschaw'-poe]: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger, S/N 42624
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1981 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069