Join Date: Jul 2000
Bikes: 1959 Capo; 1980 Peugeot PKN-10; 1981 Bianchi; 1988 Schwinn KOM-10;
Mentioned: 4 Post(s)
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Quoted: 119 Post(s)
I agree that the most likely culprits are the cogs and the chain. If your permit a chain to "stretch" by more than 1/2-percent before replacing it, you may damage your cogs. If skipping is worst in the lower gears, you may have bad freehub pawls; if it is worst in the higher gears, you probably have worn cogs.
What I would do:
1) Assuming the problem is NOT the pawls, replace the chain, if you have not already done so. Make sure you have the appropriate width of chain ("8-speed" or "9-speed").
2) If the chain still jumps, replace the cogs.
"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