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Backroader - good advice so far. A couple of "rules of thumb" that might help:

Your Navigator probably has a "triple" in front - three front chain rings. If so:

In the middle chain ring, you can probably use every gear in the back. Some times you get noise with the smallest (outermost) and largest (innermost) gears in back, so you might have to avoid them on the middle ring.

On the large (outermost) front chain ring, you generally have to avoid the two or three innermost gears in the back. Let noise be your guide here.

On the small (innermost) front chain ring, you generally have to avoid the two or three outermost gears in the back. Again, let noise be your guide here.

You see the pattern here: outermost and innermost gears front and back don't work well together.

You also should become familiar with "trimming" the front derailleur. This means that for any given front chain position, you can make minor adjustments on the front derailleur to adjust for the line of the chain depending on where it's sitting on the rear gears.

If the concept of trimming doesn't make sense to you, take your bike into the shop where you bought it and ask them to demonstrate 'trimming the front derailleur' to you. If the person you talk to can't, ask to talk to someone else!

Good luck, have fun.
 
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