yes you can trim them if there is enough thread to build the wheel.
check with your shop to see if they have a WheelSmith SpokeCalc system. it may still have ahte Wolber rims listed so they can tell you the erd, otherwise you need to measure yourself.
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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