Chain rubbing on the front derailleur

[Flur]

Unless you've got a corncob in back, those aren't "usable" gears anyhow (i.e. they almost certainly overlap with gears you can get on the other chainring). You're really not supposed to be able to use every gear combination, because of cross-chaining.

Yeah, I've found out this is not even the real issue. The issue is that the derailleur is mounted too low and is hitting the highest teeth on the larger chainring when moving from the larger chainring to the smaller one and vice versa. With the 1/2 stop trim (as he recommended) to get to the MIDDLE gears in the back (I can only use the first 3 without the trim), the derailleur actually hits the chainring teeth consistently through the cycle. I'm a little PO'd b/c this means the guy that did it didn't even run through all the gears and recheck his work before he sent me home on it. He would have HEARD it when he went from one chainring to the other in front - its really loud. And it's pretty easy to see, after looking at my other bike, that it's too low. It's going back to the shop on Tuesday, when my regular guy is there, to be fixed.