Spine Chart

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Spine Chart

Target / Field / 3D / Hunting – Recurve / Bare Bow Arrow Sizing
Bow Weight-lbs
23"
24"
25"
26"
27"
28"
29"
30"
31"
32"
15–20lbs
1300
1300
1200
1200
1100
1100
1000
1000
900
900
21–25lbs
1200
1200
1100
1100
1000
1000
900
900
800
800
26–30lbs
900
900
800
800
700
700
700
600
600
600
31–35lbs
900
800
800
700
700
600
600
500
500
500
36–40lbs
800
800
700
700
600
600
500
500
400
400
41–45lbs
800
700
700
600
600
500
500
500
400
400
46–50lbs
700
700
600
600
500
500
400
400
400
350
50–55lbs
700
600
600
600
500
500
500
400
350
350
56–60lbs
600
600
600
500
500
400
400
350
350
300
60–65lbs
500
500
500
400
400
350
350
300
300
250

NOTE: For Podium Series A/C (aluminium/carbon shaft) arrows, available in half-spine options (650, 550, 450). If your setup is close to the lower end of a spine range, select the next stiffer half-spine for best results.

* These are based on a 100–125gn point. If using a 150gn point or more you may need to use a stiffer spine. If you are using an 80gn point weight or less you may need to use a weaker spine. One spine stiff on high speed bow.

** This chart is a general recommendation only. What works best out of your bow will always be specific to your setup.

Target / Field / 3D / Hunting – Compound Bow Arrow Sizing
Bow Weight-lbs
23"
24"
25"
26"
27"
28"
29"
30"
31"
32"
15–20lbs
1100
1100
1000
1000
900
900
700
700
600
600
21–25lbs
1000
1000
900
900
800
800
700
600
600
600
26–30lbs
900
900
800
800
700
700
700
600
500
500
31–35lbs
900
800
800
800
700
700
600
600
500
500
36–40lbs
800
800
700
700
600
600
500
500
400
400
41–45lbs
700
700
600
600
600
500
500
400
350
350
46–50lbs
600
600
600
600
500
500
500
400
350
350
50–55lbs
600
600
600
500
500
500
400
350
350
56–60lbs
500
500
500
400
400
400
350
350
300
300
60–65lbs
500
500
500
400
400
350
350
300
300
250
66–70lbs
400
400
400
350
350
350
300
300
250
250

NOTE: For Podium Series A/C (aluminium/carbon shaft) arrows, available in half-spine options (650, 550, 450). If your setup is close to the lower end of a spine range, select the next stiffer half-spine for best results.

* These are based on a 100–125gn point. If using a 150gn point or more, you may need a stiffer spine. If using an 80gn point or less, you may need a weaker spine. One spine stiffer on high-speed bows.

** This chart is a general recommendation. Your bow, tune, and shooting style will determine the best result for your setup.

General Arrow Selection Tips

These are general guidelines from Zone Archery. For personalized tuning support, please visit your local Zone Dealer or contact us directly.

  • Point Weight: The chart is based on a 100-125grain point. If you use a 150+grain point, you may need a stiffer spine. With an 80-grain point, you may need a weaker spine.

  • Draw Weight: As your actual draw weight increases or decreases, the recommended spine changes. Adjusting point weight can also help fine-tune the match.

  • Arrow Length: In practice, we use arrow length (not just draw length). With modern drop-away rests, arrow length and draw length are not always proportional. For the same spine, a shorter arrow will shoot stiffer than a longer arrow. Recurve archers should carefully match draw weight and arrow length on the spine chart.

  • Final Results Matter: Charts and tuning methods are guidelines. If your bare shafts and fletched shafts group differently, trust the setup that delivers the best results. Accuracy and consistency on target are always the most important.

  • ​

Special Note for Podium Series A/C (Aluminum/Carbon Shaft)

Podium Series A/C arrows include 650, 550, and 450 half-spine options. If your setup is close to the lower limit of a spine group, we recommend selecting the stiffer half-spine size. For example, if your draw weight is just below the next stiffer category, choosing the stiffer half-spine (e.g., 650 instead of 700) may provide better results.