Certain sizes of freewheels, such as the ubiquitous 14-17-20-24-28, show up frequently on eBay. It is also very easy to find 14-22, 13-19, and other close-ratio combinations, as well as 14-32s. The real trick is to find a 13-26 or a 14-26, which will work well with older Campagnolo derailleurs whilst providing a very useful gear ratio progression with combinations of readily available chainrings. If anyone wants to sell a 14-16-18-20-23-26 ultra, I would be very interested.
__________________
"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