STANDARDIZED ARROW SPINE/DEFLECTION CHARTS:
This chart is normalized for modern compound bows with IBO speeds between 280-330 fps. For faster bows, read chart one block down and to the right. For slower bows, read chart one block up and to the left. Chart not applicable for traditional bows. NOTE: Actual arrow spine deflections do not necessarily match the manufacturer's marketed spine sizes (Gold Tip 5575, Carbon Force 200, Carbon Express 60/75, etc.). Manufacturer spine sizing systems may be arbitrary (100, 200, 300, 400) and may or may not reflect the arrows' actual spine deflections. For example, a "Carbon Express Maxima 250" has an actual spine deflection of .404", not .250" as the sizing suggests. In this case, the rating system is arbitrary. To be safe, DO NOT assume an arrow's published spine size matches the arrow's actual deflection. See actual arrow specification data above before using this chart to select an appropriate spine stiffness for your bow. If you need help, call our pro-shop at 606-297-1011 or email us for assistance.