I run a real half-step on the Peugeot: 45-42 / 13-15-17-20-23-26 (could easily go to 30T with a 7-speed freewheel or 34 with an 8-speed
My first Bianchi, a 1962, came with 52-47 / 13-16-19-23-26, which provides a 9-speed half-step, since the large-large crosschain is redundant with the 47/23, but who does large-large crosschaining, anyway?
__________________
"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069