Join Date: Jul 2000
Bikes: 1959 Capo; 1980 Peugeot PKN-10; 1981 Bianchi; 1988 Schwinn KOM-10;
Mentioned: 9 Post(s)
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Unless you have a 120mm rear axle and an "ultra" 6-speed, you can probably substitute a 7-speed freewheel. I think 12 teeth is the smallest cog you can get without a cassette. Of course, another way to get higher gearing is with a larger outer chaining, but you would need another 5 teeth on the chainring to approximate the ratiometric change of going from 13 teeth to 12.
Personally, I have no use for any gear much over 100 gear-inches. The highest gear on any of my bikes is 50/13 = 104 gear-inches, on the Bianchi.
"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