Archery term
Arrow Spine
What does Arrow Spine mean?
Arrow spine describes how stiff an arrow shaft is: how much it resists bending under a load. A common static-spine number records shaft deflection under a standardized test; in that system, a smaller number means a stiffer shaft. The number is not the shaft's diameter.
Primary source for this term: Easton Archery: FAQs (Accessed 2026)
Why it matters
Choose spine from the shaft maker's chart using your bow type, measured draw weight, draw length or finished arrow length, and point weight. For example, two shafts with the same outside diameter can have different spine ratings, and a heavier point can make the finished arrow behave weaker. Use the chart for the exact shaft model, then tune with a qualified shop or coach.
What to check
- Use the shaft maker’s chart for the exact model, bow type, measured draw weight, cut length, and point mass.
- Compare spine ratings only within the manufacturer’s system; a lower static-spine number means a stiffer shaft.
- Recheck the setup when point mass or arrow length changes.
Useful next steps
