Originally posted by Chi
If its a brand new bike, I suggest taking it back to where you bought it and have them adjust it. It's a very time consuming job and very frustrating at times. If you want to do it yourself, a good guide is the Barnett's Manual and the installation sheet that came with your front derailleur (if you got one).
From what I've experienced, rub can be encountered by any of these factors:
1. Wrong chain size (8-speed chain in a 9-speed derailleur, that's what I have)
2. Derailleur clamp set too low or too high on seat tube
3. Wrong cable tension
4. Wrong derailleur angle
5. Wrong gear combination
6. Wrong limit screw setting
Limit screw, is that the screw that i was talking about? The 2 screws at the top?