Arrow Spine Selector
Find Your Perfect Spine.
Every bow is different. Every hunter is different. Our free spine selector calculates the exact shaft stiffness for your setup — no guesswork, no wasted shots.
How it works
Precision in Four Steps
Our calculator uses the industry-standard Easton Dynamic Spine method, refined for bow type, arrow length and broadhead weight.
01
Enter your bow specs
Bow type, release method, draw weight and draw length. Takes 30 seconds.
02
Set your arrow length
Measured nock groove to shaft end. Typically draw length + 0.5–2″.
03
Choose your point weight
Field point or broadhead. Heavier heads require a stiffer spine.
04
Get your recommendation
See your spine, the calculation breakdown, and shafts to consider on either side.
Find Your Spine
Arrow Spine Selector
Enter your bow specs below to find your perfect African Reaper shaft.
Typically draw length + 0.5–2 inches. Measure nock groove to end of shaft.
Why it matters
Wrong Spine Costs You.
Inconsistent groupings
A spine that’s too weak or too stiff means erratic arrow flight. Groups open up for no obvious reason.
Broadhead tuning problems
Fixed-blade broadheads amplify spine errors dramatically. What looks fine with field points can veer badly at hunting distances.
Lost penetration
An arrow that’s fishtailing on impact loses momentum and deflects off bone. Correct spine maximises straight-line penetration.
Ready to Tune Up?
Run your numbers, find your spine, then shop the African
Reaper shaft that matches.