How to Choose the Right Spine for Traditional Archery

Selecting the correct arrow spine is one of the most important steps in tuning a traditional bow. Whether you shoot a longbow, recurve, or vintage one‑piece bow, the spine of your arrow determines how cleanly it leaves the shelf, how consistently it groups, and how forgiving your setup feels.

If you’ve ever struggled with erratic arrow flight, fishtailing, porpoising, or unpredictable groups, there’s a good chance your spine is the culprit. This guide breaks down everything you need to know about choosing the right spine for traditional archery — in clear, practical terms.

What Is Arrow Spine? (Quick Refresher)

Arrow spine refers to how stiff or flexible an arrow shaft is. Traditional bows rely heavily on proper spine because the arrow must bend around the riser during the shot — a phenomenon known as the archer’s paradox.

• Weak spine = arrow bends too much
• Stiff spine = arrow doesn’t bend enough

Your goal is to find the spine that bends just right for your bow and shooting style.

If you haven’t read it yet, your companion article Arrow Terminology for Traditional Archery breaks down spine, dynamic spine, GPI, FOC, and more in detail.

Why Spine Matters for Traditional Archery

Traditional bows are simple — no cams, no rests, no stabilizers. That means the arrow must do more of the work.

Choosing the right spine gives you:

• Clean arrow flight
• Tight groups
• Better broadhead control
• More forgiving shots
• A quieter bow

Choosing the wrong spine gives you:

• Fishtailing
• Porpoising
• Inconsistent groups
• Tuning frustration
• Poor penetration

Spine is the foundation of a well‑tuned traditional setup.

How to Choose the Right Spine (Step‑by‑Step)

Here’s a simple, reliable process for selecting the correct spine for your traditional bow.

1. Start With Your Bow’s Draw Weight

Use the actual draw weight at your draw length, not the number printed on the bow.

Example: A bow marked 40# @ 28″ might be 43–45# at a 29″ draw.

This matters because:

• More draw weight = stiffer spine needed
• Less draw weight = weaker spine needed

Most traditional archers fall into the 35–55 lb range, which is why TTT Archery stocks arrows in 400, 500, and 600 spines — the sweet spot for real‑world shooters.

If you don’t have a way to measure your ACTUAL draw weight of your bow we have a simple, affordable solution HERE

2. Consider Your Arrow Length

Arrow length affects dynamic spine:

• Longer arrows behave weaker
• Shorter arrows behave stiffer

If you draw 29–30″, you’ll likely need a stiffer spine than someone drawing 27″.

TTT Archery carries arrows for all draw lengths.

Fletched Arrows

Arrow Shafts

3. Choose Your Point Weight

Point weight has a major impact on dynamic spine:

• Heavier points weaken the spine
• Lighter points stiffen the spine

Traditional archers commonly use:

• 100 Grains
• 125 grains
• 150 grains
• 175 grains
• 200 grains (for high‑FOC setups)

If you prefer heavy points for stability and penetration, you may need a stiffer spine.

TTT Archery offers an excellent and affordable double O ring field point here: GHOST FORGE SS Field Points

We sell these points individually so you can pick up a dozen or configure your own test pack!

4. Match Spine to Your Shooting Style

Different shooting styles influence spine needs:

Split‑finger (1‑over, 2‑under)

• Slightly stiffer spine often works better
• Arrow sits lower relative to the eye

Three‑under

• Weakens dynamic spine
• Often requires a stiffer arrow
• Common among gap shooters and string walkers

Instinctive shooters

• Often prefer slightly heavier arrows for stability
• Spine selection leans toward forgiveness over speed

5. Use a Simple Spine Guide (Traditional‑Focused)

Here’s a practical starting point for most traditional setups:

How TTT Archery Makes Spine Selection Easier

Our shop is built around traditional archers, so your arrow selection is curated with spine in mind.

✔ Arrows stocked in 400–600 spine ranges

Perfect for the most common longbow and recurve draw weights.

✔ Easton Carbon Legacy, XX75 Aluminum, Gold Tip Traditional Classic, and Victory options

All proven performers with predictable spine behavior.

✔ Cut‑to‑length service

Dial in dynamic spine by matching arrow length to your draw.

✔ Voyager Feathers fletching

Premium feathers that stabilize arrows quickly and maximize cast

✔ Expert guidance

We help archers choose the right spine based on their bow, draw length, and shooting style.

This is the kind of service big‑box stores simply can’t offer.

Signs Your Spine Is Wrong (and How to Fix It)

Weak Spine Symptoms

• Arrows hit left (right‑hand shooter)
• Fishtailing
• Broadheads plane unpredictably
• Arrows group inconsistently

Fixes:

• Shorten arrow
• Use lighter points
• Choose stiffer spine
• install thicker side plate
• Increase silencer size or volume on string
• use thicker tab or glove
• reduce bow poundage if ILF

Stiff Spine Symptoms

• Arrows hit right (right‑hand shooter)
• Harsh kick off the riser
• Vertical porpoising
• Tight groups at one distance but not others

Fixes:

• Longer arrows
• Use heavier points
• Choose weaker spine
• Thinner side plate
• Thinner Tab or glove
• Reduce silencer size or volume on string
• Increase bow poundage if ILF