Arms:
Rear 15.4 14.06 1.34 x2 = 2.68
Front 13.6 12.3 1.3 x 2 = 2.6
That makes 5.28g for a set front and rear.
Gear box without inserts 14,3 vs 17,3
That makes 6g for a set front and rear.
hubs: 4,2 vs 4,1
That makes 0,2g for a set left and right.
Just my personal documentation on the Team Associated B74 and my race experience with this wheeler
