I ride an old bike. A little while ago my chain started to jump sprocket teeth when I would pedal hard. I recognized this as a classic symptom of an old and stretched chain and/or worn back cluster, but I was too busy to replace the components in question.
Before I went for a ride yesterday I noticed that the chain was dry as a bone, so I figured I’d oil 'er up. I did so with some reluctance, however, figuring that it would make the skipping worse. Instead, it seems to have cured the problem altogether! Not one skip during the entire ride.
I can’t for the life of me figure out why this worked. The oil should make the links want to slip right over the sprocket teeth, no? Can anyone explain this counterintuitive fix?