Join Date: Apr 2005
Location: SW Washington, USA
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It's normal for shift cables to stretch a bit for the first few weeks. Wherever you bought your bike, they should offer free adjustments for a couple of months, because of this.
You can do it yourself, too. There's an adjusting knob, a small black knurled thing, on your rear derailleur where the cable housing enters the derailleur. (Some shifting systems have this adjuster on the shifter, or even both places.) Turn this adjuster 1/4 turn -- CCW to "tighten" the cable, CW to "loosen" it. With a new bike, you probably want to "tighten" it, and maybe 1/2 or 3/4 turn. But it's best to go 1/4 turn at a time, and test ride.
It's also normal, in the span of a 2000-mile tour, to have to adjust this thing once in a while. So it's worthwhile to learn how to adjust it yourself.