Join Date: Jul 2000
Bikes: 1959 Capo; 1980 Peugeot PKN-10; 1981 Bianchi; 1988 Schwinn KOM-10;
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Some front derailleurs clamp onto the frame and require no braze-on. Others, lacking a clamp, bolt instead onto a fitting brazed onto the right side of the seat tube. Fortunately, there are clamp adaptors for many of the latter derailleurs.
The first time I saw a braze-on front derailleur fitting was on my friend's 1960 Schwinn Continental, which still had its original Simplex Competition suicide front shifter. My road bikes, completely spanning the 1960s and 1970s, all use clamp-on derailleurs. Sometime around 1990, braze-on front derailleurs became very popular on road bikes. The braze-ons are arguably slightly more reliable and save a bit of weight, but they can restrict your choice of chainring size and derailleur.
"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