![]() ![]() Over a 28-inch arrow shaft, the total shaft weights become 207 grains and 230 grains respectively. ![]() These differences will come into play later as we get closer to selecting our arrows.Įxample: Our 400 size arrow might have a 7.4 GPI, and the 340 arrow a 8.2 GPI. Going back to our Spine example arrows, we are left with a lighter more flexible arrow and a heavier stiffer arrow. The stiffer shafts have thicker walls, and therefore more material, giving them higher grains per inch. Stiffer arrows will naturally have higher GPI than more flexible arrows. The second important specification of carbon arrows is the weight, or GPI (grains per inch). The amount of flex directly impacts how well the arrow flies as it goes downrange. An 80lb bow, on the other hand, would impart much higher forces and a lot more flex into the arrow as if comes off the bow. When it comes to shooting these arrows, a 30lb draw bow may barely bend the 340 arrows at all. The smaller the number the stiffer the arrow is. The standardized test for determining spine deflection is taking a 28” arrow shaft and hanging a 1.92-pound weight from the shaft midpoint.Įxample: Arrows that deflected 0.400 inches were classified as size 400 arrows, and a 0.340” deflection would be a size 340 arrow. Spine is simply how much the shaft bends under a specific load. ![]() Arrow SpineĪrrow spine deflection is the key to the entire arrow selection process. Once you understand these things are all interacting with each other, and each has their tradeoffs, the complex quesiton of arrow section becomes much easier. The arrow spine, weight (gpi), and you tip weight are the most important aspects of arrow selection. The key to understanding arrow specifications are simple once you grasp the basics. As the archery world has moved to carbon arrows, arrow spine deflection became the most crucial factor in hunting arrow selection. The Easton arrow charts were developed simply to make it easier for everyday shooters to figure out what arrow to choose for their bow. Example: An Easton aluminum arrow with the digits 2512 means the shaft is 0.250” in diameter with 0.012” wall thickness. ![]()
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