Join Date: Jul 2000
Bikes: 1959 Capo; 1980 Peugeot PKN-10; 1981 Bianchi; 1988 Schwinn KOM-10;
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If it is Carbolite 103 (plain-gauge carbon steel), don't bother, unless you can find cheap used components for the upgrade. If it really is double-butted CrMo, go for it.
Several years ago, when I changed cranks on my PKN-10, I forced an English-threaded (24 TPI) fixed cup into the Swiss-threaded (25.4TPI) BB shell, and this has given me no problems whatsoever. Other BB options include reaming and tapping to Italian standard and cartridge BB assemblies designed for threadless assembly into a (presumably stripped) BB shell.
"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