Does the shaft recover, or fight you?
Every arrow flexes off the string. Spine is how much. Too weak and it porpoises out of the rest; too stiff and it never settles — and a fixed-blade head will steer both.
The manufacturer's chart gets you to the right neighborhood off draw weight, draw length and point weight. From there it shifts with cam aggression and how clean your release is. You make the call — we build exactly what you spec.
- Static spine
- 250 / 300 / 340 / 400 / 500
- Starting point
- Manufacturer chart
- Final call
- Yours