The only multispeed 1/8" cogsets I have seen were hybrid drive train adaptors for Sturmey Archer 3-speed epicyclic hubs, to give one 9 or 12 speeds. I used those with 1/8" chains and either 1/8" or 3/32" chainrings, which worked fine, as long as I had enough width in the rear derailleur cage. (Old Campagnolo Gran Sports, Cyclos, and Simplex TdFs worked fine.)
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"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