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10-20-02 | 07:37 PM

#22

John E

feros ferio

Joined: Jul 2000

Posts: 22,374

Likes: 1,847

From: www.ci.encinitas.ca.us

Bikes: 1959 Capo Modell Campagnolo; 1960 Capo Sieger (2); 1962 Carlton Franco Suisse; 1970 Peugeot UO-8; 1982 Bianchi Campione d'Italia; 1988 Schwinn Project KOM-10;

Quote:

Originally posted by pokey
That's a generalization about BCD that does not work very well. Suntour used 135, Campy and others 135 and 144, and I have run into 110 in that vintage.It pays to measure.

Look at your inner chainring. You can probably tell by inspection whether your bolt circle diameter (BCD) would permit you to install something with a smaller diameter (and fewer teeth). Sheldon Brown has a comprehensive discussion of BCDs, tooth counts, brands, years, etc. Summary:

151mm BCD --> 44T minimum chainring size
144mm / 41T (common in 1970s)
135mm / 39T (Campag only)
130mm / 38T (common in 1980s and 1990s)
128mm / 38T (Nervar only)
122mm / 38T (Stronglight only)
110mm / 34T (common in 1980s and 1990s)

__________________
"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

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