Easton's current shaft selection chart (PN 301055-A), read for you. Type in your bow weight and arrow length — or tap the chart — and it picks out the recommended spine range your setup lands in, with the shafts that fit it below.
Everything it takes to find your spine: the bow you shoot, the kind of shaft you want, the weight and length you shoot them at, and the variables that shift the bow weight behind it all.
On your fingers at full draw, not the number on the limb.
Nock throat to the end of the shaft, not counting the point.
Easton moves the chart 3 lb for every 25 gr either side of 100 gr.
| Bow weight | 21" | 22" | 23" | 24" | 25" | 26" | 27" | 28" | 29" | 30" | 31" | 32" | 33" | 34" |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| <20 lb | ||||||||||||||
| 21–26 lb | ||||||||||||||
| 27–31 lb | ||||||||||||||
| 32–35 lb | ||||||||||||||
| 36–39 lb | ||||||||||||||
| 40–43 lb | ||||||||||||||
| 44–47 lb | ||||||||||||||
| 48–52 lb | ||||||||||||||
| 53–57 lb | ||||||||||||||
| 58–62 lb | ||||||||||||||
| 63–67 lb | ||||||||||||||
| 68–73 lb |
Recommended spine
640–570
40–43 lb · 28"
In aluminium: 1916, 2013, 2014, RX7-21.
You're right at the bottom of the 40–43 lb band, so the weaker range (675–600) is worth testing too.
2 of 14 listed
A/C/Ealuminum/carbon/extreme
620
In range
X10aluminum/carbon
600
In range
Bands, spine ranges and aluminium sizes are Easton's current target shaft selection chart, reproduced value for value from PN 301055-A. The A/C and carbon table runs 21"–34", the aluminium table 21"–32"; a length of x.5" or more rounds up to the next arrow length, as Easton specifies.
Shaft sizes, spines and grains-per-inch come from Easton's shaft tables. Carbon shafts are matched by spine falling inside the recommended range; aluminium shafts are the sizes the chart names.
A chart is a starting point, not a tune. Bare-shaft or walk-back test before you commit to a set. For how the chart works and how to pick a shaft out of a range, see finding your Easton arrow spine.