Ill ask a question along the same lines. I noticed my bike chain rubs only on big/small or small/big. I am riding an Ultegra Double, and these are the only two combos that the chain rubs in. I have had my bike for about a month now, and my LBS said that I should bring it back in about a month or so and get everything dialed in after the initial riding period.

Also, when in my small chainring, I notice that there is a clicking every time my pedal stroke makes on complete revolution. This only happens in my small chainring.

thanks,
mscycler