I am with Ramzilla's suggestion. If your commuting (are these trails paved or just hard packed dirt?) a good set of 36h box section rims will give you a good ride and be pretty durable.
Sun/Shimano CR18 Wheel Set 700c Silver
BTW nice commuter.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk