Join Date: Jul 2000
Bikes: 1959 Capo; 1980 Peugeot PKN-10; 1981 Bianchi; 1988 Schwinn KOM-10;
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Is the chain rubbing on the outer chainring or on the derailleur cage? I hate indexing of front derailleurs because it can preclude proper centering of the cage over the chain.
You should indeed avoid riding in the small-small combination(s), because this will greatly accelerate chain and cog wear. You will also find that there is a fair amount of ratio range overlap between your two chainrings, such that small-small corresponds to something like large-middle, e.g., 39/12 falls between 53/17 and 53/16.
"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