I picked up a trek 820 to ride around and it's pretty great except for one small problem (get it? SMALL). The bike won't shift into the smallest back cog. In fact, the whole thing is one "gear" off. I suppose the bike could be all buggered up but I tend to think that some "minor adjustment" is more in order. The cable is plenty slack in the low and since thins bike was used daily before I got my hands on it, I tend to think that major screwing around is not necessary but I guess.

Yes, this in my one zillionth shifting question. I just can't get the hang of it.