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Arrow Length - refers to the length of the arrow shaft. Arrow size - refers to the spine (stiffness) of the arrow. The shaft size is always referring to the diameter of the shaft, the wall thickness of the shaft and the distance that the arrow shaft will flex before it bends or breaks.
Posts. 272. Arrow length is typically measured from the groove in the nock where the string sits to the start of the point, but not including the point. However, most of the archery programs that calculate spine use the actual length of the shaft material. ~petev. June 9th, 2013, 03:58 PM #10.