Spine

Arrow spine indicates how stiff or flexible an arrow shaft is. It is crucial for proper tuning between the arrow and the bow.

Static spine:

  • Measured in a standardized way (load applied at the center of the shaft).
  • Deflection is given in thousandths of an inch.
  • Examples:
    • 500 spine → softer
    • 400 spine → stiffer
    • 340 spine → even stiffer
  • 👉 The lower the number, the stiffer the arrow.

Dynamic spine:

  • The actual bending behavior of the arrow during the shot.
  • Influenced by:
    • Shooting technique
    • Draw weight
    • Draw length
    • Arrow tip weight
    • Bowstring
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