Old 01-21-10, 11:13 PM
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pwdeegan
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Location: Eugene, OR
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Bikes: Salsa La Cruz with Rohloff; mutt parts

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i definitely don't trust your counting skills for the total number of possible gears on your Trek 520 (i.e., how many chainrings have you got, multiply this number [probably 2 or 3] by the number of "gears" in the rear, and you'll have your number, which is not going to be 21 if you really have a 9-speed cog int he rear).

however, to your real question, yes, you can use the right-hand 10-speed bar-end to shift the 10 speeds of your rear cassette; the left-hand shifter would ostensibly shift your front derailleur, if you had one. so typically you could have a 10 speed, or a 20 speed (2-front x 10-rear), or even a 30 speed (3-front x 10-rear). i run a similar set-up on my wife's commuter bike.
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