My bike has a compact crank (34/50). As the larger chainring is often too large for the speed at which I ride, I use the smaller one most of the time. However, since it is compact I find myself having to use the smallest cogs in order to maintain a reasonable cadence. I'd say my most common gear is 34 in front and third smallest cog in back, although i also frequently put it in the second smallest. Although i never use the smallest cog with the small chaingring, i'm worried about cross-chaining and it's possible effects on my drivetrain, the first of which I've noticed is a very faint squeaking noise every so often, though I'm not sure where it's coming from. Any suggestions on how to avoid crossing my chain (if it is actually a problem). I was thinking of possibly getting a larger inner chainring, does that make sense?