My 175mm XTR M970 drive side crank arm weighs 329g and the non-drive side weighs 212 including the crank arm attachment bolt. I've seen the BB on a scale elasewhere (I didn't need the M970 BB for my build), and it weighs 87g. I have no idea how much more the 180mm crankset would weigh.
Now if I could only find some bearings to fit my frame and accept my Clavicula cranks (320g total) I could knock off another almost 1/2 lb from my bike's weight.
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