Arrow Spine Chart

For a 70-pound compound bow at a 29–30″ draw length with a moderate cam, a 340 spine is the correct starting point; a 300 spine is right if you shoot an aggressive cam (binary/hybrid hard-wall) or run a heavy 100–125 grain point + brass insert. The 340 spine deflects 0.340″ under the AMO 1.94 lb test load and is built for the 60–70 lb draw band. Always start at 340, paper-tune, and step to 300 only if you see a tail-right (too weak) tear — not the other way around.

Easton's spine chart lists each model with its available spine grades (300 / 340 / 400 / 500 / 600), GPI, and the draw-weight band it is built for. The 'Easton 5.0' and 'Easton Axis 5mm' search terms resolve to the same Axis 5mm carbon line — the '5mm' is the shaft's internal diameter, NOT a spine grade. Axis 5mm uses the standard 300–600 numeric spine scale, so an 'Easton 5.0 spine chart' is simply the Axis 5mm row of the Easton brand chart above. Match the numeric spine to your draw weight first, then choose the model.

No — and this is the single most common spine-chart mistake. A HIGHER spine number means a WEAKER (more flexible) shaft, because the number is the deflection in thousandths of an inch under the AMO 1.94 lb load. A 500 spine deflects 0.500″ (weak, ≤45 lb); a 300 spine deflects only 0.300″ (stiff, 70–80 lb). So 300 is stiffer than 500. If you remember one rule: smaller number = stiffer shaft = heavier draw weight.

Gold Tip, Victory and Black Eagle use the identical 300–600 numeric scale as Easton, so a Gold Tip 340 ≈ an Easton 340 ≈ a Victory 350 ≈ a Black Eagle 350. Carbon Express is the exception: its Maxima Red line is sold in 250 / 350 / 450 grades because of the reduced-diameter Bulldog construction, so a Carbon Express 350 sits between an Easton 340 and 400 — do not map it 1:1 to an Easton 350 (which does not exist as a standard grade). The cross-brand comparison table above gives the safe equivalents.

Recurve and compound use the same numeric spine scale, but recurve shooters step to a WEAKER spine at a given draw weight because a finger release loads the arrow more gently than a mechanical release and recurve cams (none) store less energy. As a rule of thumb, a 45 lb recurve ≈ a 55–60 lb compound in spine demand, both landing around a 400–500 spine. The compound vs recurve vs traditional matrix above bakes that correction in — pick your bow type and read the matching row.

Yes — 'arrow spline chart', 'arrows spine chart', and 'spine chart arrows' are all common spelling variants of the same intent: a lookup table that maps draw weight and draw length to a recommended arrow spine number. The static deflection table and the brand charts on this page answer every one of those variants. The correct industry term is 'spine' (the shaft's stiffness), but search engines resolve 'spline' to the same set of charts.

Aluminum arrows (Easton XX75 / Legend) do not use a spine number — they use a 4-digit size code where the first two digits are the outer diameter in 64ths of an inch and the last two are the wall thickness in thousandths. A 2219 = 22/64″ diameter with a .019″ wall. Heavier draw weights need larger diameter and/or thicker wall codes: 1916 for ~30–40 lb, 2219 for ~55–65 lb, 2514 for 70+ lb and crossbows. The aluminum table above lists the safe code per draw band.

A heavier point (100 → 125 grain, or adding a 50 grain brass insert) makes the arrow flex MORE — the dynamic spine behaves WEAKER — so you may need to step UP one spine grade (e.g. 400 → 340) to compensate. Adding draw length has the same effect: every +1″ of draw length loads the shaft harder and weakens dynamic spine, so a 70 lb bow at 32″ draw often wants a 300 where the same bow at 28″ wants a 340. The decision tree above applies both corrections automatically.

A 60-pound compound at 28–29″ draw with a 100 gr point wants a 400 spine — this is the most common 60 lb setup. Step stiffer to a 340 if you shoot an aggressive cam (binary / hard-wall), run a 125+ gr point, draw 30″ or longer, or add a 50 gr brass insert. Step weaker to a 500 only for a smooth-cam 60 lb bow at 27″ draw with a 75–85 gr target point. For a 60 lb recurve, the typical answer is a 500 spine because a finger release loads the shaft more gently than a mechanical release. Use the selector at the top of this page for an exact 60 lb bow spine calculator answer.

Arrow shaft size has two components beyond spine: diameter and length. Modern carbon shafts come in three diameter classes — full diameter (6.2 mm ID, e.g. Gold Tip Hunter), micro diameter (5.0 mm, e.g. Easton Axis 5mm, FMJ, Victory VAP), and ultra-micro (<4 mm, e.g. Black Eagle Deep Impact, Victory RIP TKO). Micro and ultra-micro shafts penetrate better and drift less in crosswinds but accept fewer insert options. Aluminum arrows use a 4-digit Easton size code (e.g., 2219 = 22/64″ OD × .019″ wall) instead of a numeric spine — see the Aluminum brand card above. Cut length should be 0.5–1.0″ longer than your draw length.

Yes — the interactive selector at the top of this page works as a Gold Tip spine calculator, Victory spine calculator, 3Rivers (Three Rivers Archery) spine calculator, or any of the seven brand families in the brand charts section. Click a brand chip below the selector to scope the recommendation to that brand's spine grades. The numeric spine scale is identical across Gold Tip, Victory, Black Eagle, and most Easton carbon lines (300/340/400/500/600), so the same calculator answer applies to all of them; Carbon Express Maxima Red (250/350/450) and 3Rivers traditional wood shafts (150/190 etc.) use brand-specific scales that the brand filter handles automatically.

Yes — the Traditional (Longbow / Recurve) matrix above is the longbow arrow spine chart. Longbows and one-piece recurves are shot off the fingers with no cam, so they load the shaft more gently than a compound at the same draw weight; the matrix bakes that correction in by stepping one spine WEAKER than compound (for example, a 45 lb longbow lands around a 500 spine where a 45 lb compound would want a 600). The 3Rivers / GrizzlyStik wood-shaft card below the matrix is the dedicated traditional longbow chart for cedar and bamboo-carbon shafts, which use a separate 5/16″ dowel weight scale (150 / 190 / 200) rather than the AMO numeric spine — do not cross-map the two scales.

Yes. '3 rivers spine chart', 'three rivers spine chart' and '3rivers spine chart' are all spelling variants of the same intent — the 3Rivers Archery / GrizzlyStik traditional wood-shaft table on this page. 3Rivers Archery is a traditional-archery retailer whose in-house selector is built on the same wood-dowel spine scale (150 / 190 / 200 etc.) shown in the 3Rivers brand card here, so the chart above is the 'three rivers spine chart' you are looking for. If you shoot a modern carbon recurve bow rather than wood, use the recurve matrix at the top instead — it uses the standard AMO 300–600 scale.

'Altra' is not a recognised arrow or shaft brand — it is almost always a spelling drift from 'Arrow' ('altra arrow spine chart' → 'arrow spine chart') or a confusion with a footwear brand of the same name. The correct intent resolves to the charts on this page: pick the brand card for the shaft you actually shoot (Easton, Gold Tip, Victory, Black Eagle, Carbon Express, 3Rivers or aluminum) and read the spine row for your draw weight. If you meant a specific niche or regional shaft not listed above, use the AMO numeric spine scale (300 / 340 / 400 / 500 / 600) and the static deflection table — every manufacturer that follows the AMO / ASTM F2031-05 standard uses the same numbering, so an unlisted brand's spine number maps directly onto the cross-brand equivalents table here.