Anthony BestGolf Performance Advisory
Iron Shaft Advisory · Performance Analysis · 2026
The Case for Better
Iron Shafts
Iron Shafts
A data-driven analysis of the Fujikura Axiom 105 as a replacement for the UST Mamiya Recoil Dart 94g — for a player operating at the ceiling of his current shaft's speed range.
Prepared for
Anthony Best
Reference
SHAFT-2026-001
Classification
Confidential
anthonybest.com · Iron Shaft Advisory Series · 2026
02 · The Existing Weapon
The shaft that built
the current game.
the current game.
✦ UST Mamiya · Single Blank Design
Recoil Dart94 gram
UST Mamiya's Recoil Dart series brought high-performance graphite iron shafts into the mainstream — offering a mid-launch, mid-spin profile with a stabilized tip designed to reduce face angle variability for players transitioning from steel. At 94g, it targets the 75–90 mph iron speed window with a parallel single-blank construction that delivers consistent feel across the set.
Weight
94g
Launch
Mid
Spin
Mid
Tip
Stabilized
Torque
~3.5–4.0°
Segment
Single blank
Speed range
75–90 mph
Anthony at
87 mph 7i ⚠️
Bag context
Installed in Mizuno JPX 923 Forged (5–PW), set 1° weak and 1° flat. The JPX 923 uses Chromoly 4120 steel in the 4–7 irons and softer 1025E mild carbon steel in the 8i–PW — two materially different compression zones across the same set of shafts.
Why the Recoil Dart 94g was the right shaft at the right time
The Dart's single-blank construction delivers a consistent flex profile from long irons through wedges. Its stabilized tip reduces the face-angle variability that causes misses in mid-speed players, and the mid-launch, mid-spin tuning suits a player building iron game patterns. At 75–85 mph, this shaft performs exactly as designed. It is not a compromised shaft — it is a well-engineered one that has been doing its job effectively.
Why "stabilized" tip is meaningful — within its design window
The Dart's stabilized tip section is stiffer than a raw graphite tip, reducing the oscillation that produces unpredictable face-angle timing at impact. This is why the shaft produces relatively tight miss patterns for mid-speed players. However, "stabilized" is not the same as "stiffened." At 87 mph — the ceiling of its intended range — the tip is being loaded beyond its design parameters on every swing. The stabilization system is operating beyond its operating window.
Why 94 grams was a deliberate, thoughtful choice
Lighter graphite shafts reduce cumulative joint load across thousands of swings — a legitimate consideration for any player who is in the game for the long term. The Dart 94g represents a real performance-versus-longevity trade-off. It is not a wrong choice to make. The question is whether the performance ceiling that comes with that weight is still the right trade-off at 87 mph.
The constraint: At 87 mph, Anthony is operating at the top of the Dart's intended speed range. The shaft is not broken. It has been outgrown. The miss pattern — pulls, weak cuts, and thin contact — is consistent with a shaft being asked to do more than it was built to handle. This is not a shaft that failed. It is a shaft that has been maximized.
03 · Executive Summary
The verdict,
before the evidence.
before the evidence.
Primary finding
Anthony's 87 mph 7-iron speed places him at the ceiling of the Recoil Dart's designed range — and the miss pattern is exactly what that looks like. The Fujikura Axiom 105 is not a luxury upgrade. It is a speed-range correction. One primary recommendation. The data that follows is the proof — with the caveat that a fitting session is required before committing $700.
FINDING 01
87 mph is the ceiling of the Dart's range — not the sweet spot.
The Recoil Dart 94g is designed for 75–90 mph. Anthony's 7-iron speed of 87 mph puts him within 3 mph of the top of that window. The shaft is being loaded at a level that exceeds its optimal operating range on every swing — producing inconsistent tip timing, variable face angle at impact, and the three-miss pattern that follows.
FINDING 02
High variance across spin, smash, and carry is the primary finding.
Sunday LM data shows descent angle at 43.2° (optimal range 43–47°), roll-out at 2.3 yards, and carry at 169.1 yards — contradicting prior range-ball estimates. The real problem: spin variance of 984 rpm across 15 shots (range 3,577–6,863), smash variance of 0.19, and carry spread of 27 yards. This dispersion pattern is consistent with a shaft operating at the ceiling of its speed range, producing variable tip timing on every swing.
FINDING 03
The Axiom 105's 3-part design is built for exactly this equipment.
The Fujikura Axiom 105's LP/MP/SP segment architecture isn't a generic shaft upgrade — it directly addresses the JPX 923 Forged's dual-material construction. The MP profile covers the Chromoly 5–7 irons; the SP profile covers the softer 1025E 8i–PW. No other shaft in this evaluation is purpose-matched to this specific iron set the way the Axiom is.
04 · Player Profile
The numbers that
frame the decision.
frame the decision.
7-Iron Club Speed
84.3 mph
(range 79.4–87.9)
(range 79.4–87.9)
⚠️ High variance — 2.6 mph dev
Sunday session avg 84.3 mph (15 shots, outdoor Mevo+). Prior LM session measured 87 mph peak. Range of 84–87 mph across sessions; club speed dev of 2.6 mph within Sunday session itself. The Dart 94g is rated for 75–90 mph — Anthony's range sits 4–6 mph from the ceiling, and the high variance suggests the shaft is being asked to manage a wider load window than it's built for.
Driver / 7-Iron Speed Ratio
1.16×
⚠️ Flagged — expected 1.25–1.30×
Driver speed confirmed at 101 mph. The ratio of 1.16× against an expected 1.25–1.30× suggests the iron speed may be conservative — either the 7-iron measurement is slightly low, or driver speed is running high. If true 7i speed is closer to 84–85 mph, the Dart's case weakens. This ratio must be resolved at the fitting session.
7-Iron Spin Rate
5,888
rpm avg
rpm avg
⚠️ High variance — 984 rpm dev (17% of mean)
Sunday session avg 5,888 rpm on outdoor range balls; range 3,577–6,863 rpm across 15 shots. Optimal at 84.3 mph is 6,200–7,000 rpm. Range balls read 300–700 rpm low vs. real Pro V1; with that adjustment, expected 6,188–6,588 rpm. The variance of ±984 rpm (one standard dev) is the dominant finding — shots are landing and stopping at wildly different rates. Pro V1 confirmation session pending.
Handicap Index
2.0
Elite amateur baseline
A 2.0 handicap with a confirmed 72 on a par 70 (5 birdies) demonstrates that the current equipment is performing. This is not a player whose equipment is holding him back across the board. The shaft question is about ceiling and consistency — converting the good rounds into every round, and the misses into near-misses.
Miss pattern
Long pull · Weak cut · Thin / low on face — all three share a common mechanism: inconsistent shaft tip timing through the impact zone. A shaft operating at its speed ceiling produces variable tip kick — early release → pull, late release → weak cut, inconsistent arc bottom → thin.
"A 72 on a par 70 with 5 birdies is not a player whose equipment is broken. It is a player whose equipment has reached its ceiling. The shaft change isn't corrective — it's expansive."
05 · The Numbers
What the data shows —
and what it doesn't yet.
and what it doesn't yet.
Data quality note
Not all of this data is equal. Two numbers are LM-confirmed. Four are anecdotal or inferred. The case for the Axiom is directionally sound — but the magnitude of the expected gain is unknown until a proper fitting session is run with real Pro V1s.
Actual vs optimal — 7-iron at 84.3 mph / 32° effective loft (Sunday LM data)
Metric
Actual (Avg)
Optimal
Status
Spin rate
5,888 rpm ✅
6,200–7,000
Dev: 984
Smash factor
1.33 ✅
1.33–1.38
✅ Optimal
Descent angle
43.2° ✅
43–47°
✅ Optimal
Roll-out (7i)
2.3 yds ✅
8–12 yds
✅ Adequate
Carry (7i)
169.1 yds ✅
160–167 yds
✅ Strong
✅ Confirmed LM (outdoor range balls) · Dev: standard deviation across 15 shots · Range ball spin may be +300–700 rpm low vs. real Pro V1
Expected gains — Axiom 105 vs Recoil Dart 94g
Spin consistency
Dev: 984 → ~400–600 rpm
Current range 3,577–6,863 rpm. Stiffer VeloCore tip reduces shot-to-shot variance. Tighter window = more predictable landing and stopping.
Smash consistency
Dev: 0.052 → ~0.03–0.04
Tighter tip behavior = more repeatable sweet-spot contact. Current 1.25–1.44 range narrows. More reliable ball speed.
Carry consistency
Dev: 8.6 → ~5–6 yards
Current 155–183 yard spread. Reduced variance in spin + smash compounds to tighter carry window. Average may improve slightly via better consistency, not absolute distance.
Confidence caveat
These projections are directionally sound but magnitude-uncertain. A fitting session comparing both shafts on a launch monitor — standard deviation, not just averages — is the final gate before any purchase.
06 · Decision Matrix
Three options scored
across five criteria.
across five criteria.
Criteria weights
30% Speed range fit
25% Tip / torque stability
20% Segment optimization
15% Feel / transition
10% Price vs gain
Dominant advantage
Strong advantage
Moderate / partial
Eliminated / minimal
Scores based on published shaft specifications and independent launch monitor data. Speed range fit scored relative to Anthony's confirmed 87 mph 7-iron club speed.
| Shaft | Speed fit | Tip stability | Segment | Feel | Price/gain | Score |
|---|---|---|---|---|---|---|
| Fujikura Axiom 105 SELECTED | 100% | 100% | 100% | 85% | 50% | 93 |
| UST Dart V 105 | 88% | 75% | 35% | 90% | 80% | 74 |
| Recoil Dart 94g (status quo) | 25% | 40% | 10% | 100% | 100% | 39 |
Scoring methodology —
Speed range fit scores the shaft's optimal speed range against Anthony's confirmed 87 mph 7-iron speed. A score of 100% indicates the player sits in the middle of the design window; lower scores indicate he approaches or exceeds the design ceiling.
·
Tip / torque stability reflects published torque rating and tip construction technology relative to each other — VeloCore (Axiom) rated dominant, TSPX (Dart V) rated strong, stabilized tip (Dart 94g) rated moderate at 87 mph.
·
Segment optimization scores per-iron profile tuning: 3-part LP/MP/SP (Axiom 105) rated dominant; single-blank designs rated minimal. Recoil Dart status quo rated minimal given no segmentation across JPX 923's dual-material construction.
07 · Primary recommendation
Fujikura
Axiom 105
Axiom 105
The only shaft in this evaluation purpose-built for an 87 mph player with a matched segment design for the JPX 923 Forged's dual-material construction.
~$105–115 per shaft · ~$630–690 set
⚠️ Fitting session required before purchase
Full bag context
Driver
Ping G430 Max · 9.5°
5W / 7W
Ping G430 Max
4 Hybrid
Ping G430 · +1.5°
5–PW
JPX 923 Forged · 1° weak
Wedges
Mizuno T24 · 48/53/58°
Putter
Putter Lab OZ.1i
Why the Axiom 105 wins on every technical dimension
Four compounding advantages
that close the case.
that close the case.
🎯
Perfect speed range fit
Designed for 80–106 mph. Anthony at 87 mph sits at the optimal center of this range — not the ceiling. Every swing benefits from the shaft operating within its design window for the first time.
⚙️
VeloCore tip stability
Proprietary stiffened tip derived from Ventus technology delivers sub-2° progressive torque. Variable face-angle timing — the mechanism behind all three of Anthony's misses — is the specific problem this technology addresses.
📐
3-part segment design
LP profile for 2–4i, MP for 5–7i (Chromoly), SP for 8i–W (1025E mild steel). The segment boundaries align directly with the JPX 923's material transition. No other shaft in this evaluation is matched this precisely to this iron set.
📊
Dispersion improvement
Sub-2° progressive torque means off-center mishits hold line better than any single-blank design can. Tighter face-to-path spread eliminates the pull/cut pattern — without requiring any change to the swing itself.
08 · Alternative Option
Middle-ground option — worth fitting
UST Mamiya Dart V 105
TSPX Construction · Lower, Penetrating Profile
Weight
105g
Launch
Low-Mid
Spin
Low-Mid
Tip
TSPX stiffened
Torque
~2.5–3.0°
Segment
Single blank
Speed range
~80–100 mph
Per shaft
~$70–80
Set cost
~$420–480
74
Composite
Score / 100
Score / 100
vs 93
Axiom 105
score
score
Why it's a strong option
Same Dart family — familiar flex profile and transition
The Dart V 105 shares the Recoil Dart's general feel and flex pattern — the loading and kick timing will be familiar from day one. For a player who values a consistent stroke feel, this is the lowest-disruption upgrade path. No re-calibration required. The TSPX tip brings a meaningfully stiffer tip section than the standard Dart's stabilized construction.
Lower, more penetrating ball flight vs standard Dart
The Dart V's TSPX construction produces a distinctly more penetrating trajectory than the standard Recoil Dart — lower peak height, better wind performance, tighter shape. For a player whose current 7-iron has excess roll-out from a too-shallow descent angle, a lower, more driven flight is the right direction.
Meaningful cost saving over the Axiom
At ~$420–480 for a set of six, the Dart V 105 sits approximately $200 below the Axiom 105. If fitting data shows the TSPX construction closes the spin gap adequately — even without VeloCore stability — this is a legitimate outcome. The fitting session should compare both shafts directly before any decision is made.
WHY THE AXIOM 105 IS PREFERRED
Single-blank construction doesn't address the JPX 923's material transition
The Dart V 105's single-blank design gives every iron in the set the same flex profile — 5-iron through PW receive identical shaft behavior. The JPX 923 Forged uses two different materials with different compression characteristics at the 7i/8i boundary. A single-blank shaft treats a 5i and a PW identically; the Axiom's 3-part segmentation does not. This is the structural advantage that separates the two shafts.
TSPX tip is a better Dart — VeloCore is a different technology class
TSPX is an improved tip construction within the same design family as the standard Dart. VeloCore is Fujikura's iron-specific adaptation of the technology used in the Ventus driver shaft line — engineered specifically to address face-angle variability at the tip. The Dart V is a meaningful upgrade from the Dart 94g. The Axiom is a step-change in tip behavior. At 87 mph with a documented pull/cut miss pattern, the Axiom's technology class is the more targeted intervention.
Best for: Players who want a meaningful upgrade from the Dart 94g at a lower cost, with minimum transition disruption. Worth including in any fitting session as the middle option — data will confirm whether TSPX closes the gap adequately, or whether VeloCore's performance justifies the price premium.
09 · Risk Register
What could go wrong —
and what to do about it.
and what to do about it.
High Risk
Key metrics are unconfirmed — the miss may be mechanical, not shaft-related
Spin (range ball), smash factor (inferred), carry (anecdotal), and descent angle (estimated) are all unconfirmed. More critically: the thin miss and low spin could be caused by shallow angle of attack or early extension — swing mechanics issues that no shaft change will fix. Spending $700 without resolving this question is premature.
Mitigation Run the full LM protocol (see S10) before purchasing. Gate the decision on: confirmed smash factor below 1.30 consistently, real Pro V1 spin below 5,800 rpm, face-to-path spread above 3° shot-to-shot, and AoA between −3° and −5°. If any of these thresholds are not met, the shaft case weakens.
Medium Risk
$630–690 investment on directional logic without back-to-back fitting data
The analysis is built on sound physics and accurate speed data — but projected gains in carry distance and spin improvement are theoretical. Magnitude is unknown. The Axiom could underperform expectations if swing mechanics are a contributing factor, or if Pro V1 spin is already adequate at 5,800–6,200 rpm.
Mitigation Include a shaft fitting session as the final gate — not optional. Hit both the Dart 94g and Axiom 105 back-to-back on a launch monitor. Compare standard deviation of spin, smash factor, and face-to-path across a minimum of 10 shots per shaft. Look at dispersion, not averages. The Dart V 105 should also be included as the middle option.
Low Risk
Transition period — new shaft feel and load profile
Moving from a 94g single-blank graphite shaft to a 105g segmented shaft with stiffer tip behavior will feel different, particularly in the 8i–PW where the SP segment profile is most distinct from the current Dart. A 1–2 round calibration period should be expected before the new shaft's consistency advantage becomes apparent in scoring.
Mitigation Retain the Recoil Dart 94g set for at least one round post-installation as a fallback. If feel is significantly disrupted, an additional fitting session with the re-grip technician can adjust tip trim length to fine-tune flex profile. Standard transition risk — manageable with an expectation-setting period.
Overall decision confidence: Medium. The directional logic is sound. The speed-range case is clear. The data is insufficient to commit $700 without a proper fitting session. The protocol on the next slide exists to resolve this.
10 · Data Collection Protocol
One session separates
hypothesis from conviction.
hypothesis from conviction.
Recommended session order
1. Outdoor range · Real Pro V1 Left Dots + Mevo+. Primary data. Spin directional only but most representative.
2. Indoor Mevo+ · Metallic dots on range balls. Better spin repeatability than outdoor range balls.
3. Instructor session · Qualified eye on AoA and impact position — rule out mechanical cause before buying.
4. Fitting session · Hit Dart 94g / Dart V 105 / Axiom 105 back-to-back on LM. Look at dispersion, not averages.
Shot requirements
| Club | Shots | Purpose |
|---|---|---|
| 7-iron | 20 min. | Primary anchor — all key metrics |
| PW (44°) | 15 | 1025E smash / spin vs Chromoly |
| 9-iron | 12 | Validate anecdotal 150 total |
| 5-iron | 12 | Long iron spin, LP/MP boundary |
| Driver | 10 | Explain low D/i speed ratio |
| 48° wedge | 8 | Validate 115 total anecdotal |
7-iron tagging protocol
For each of the 20 shots, note: (1) felt contact location (center / low / toe / heel), (2) miss shape (straight / pull / cut). Cross-reference against Mevo+ data to correlate felt contact against spin, smash, and AoA — the critical diagnostic link.
If any of these are true — shaft case weakens
AoA shallower than −1° → thin miss is mechanical, not shaft-related. An instructor session and swing fix should precede any shaft purchase.
Real Pro V1 spin on 7i is 6,200+ rpm → range ball was suppressing the number. The spin problem may not exist with the actual ball.
Smash factor consistently 1.32+ → contact quality is not the problem. The carry deficit has another cause.
Face-to-path spread across 20 shots is < 3° → face timing is actually consistent. The pull/cut pattern has a different root cause.
If all of these are true — shaft case is confirmed
Spin stays below 5,800 rpm with real Pro V1 → spin stripping is real and persistent, not range ball suppression.
Smash factor remains below 1.30 consistently → contact quality is degraded by inconsistent tip behavior, not face alignment.
Descent angle is below 40° → trajectory is too shallow for the effective loft and speed. Shaft-induced dynamic loft stripping is confirmed.
Face-to-path spread > 3° shot-to-shot → face timing is inconsistent. Tip torque is the most likely cause at 87 mph.
AoA is between −3° and −5° → correct mechanics confirmed; performance gap is equipment, not swing.
Indoor Mevo+ setup requirements
Metallic dots applied to range balls · Indoor mode enabled · RCT/metallic dot mode on · Device exactly 8 feet behind ball · Minimum 8 feet ball flight before net (13 ft preferred) · Replace dots every 3–4 shots. Spin with metallic dots is directionally reliable but not equivalent to real Pro V1 outdoors.
✦
Iron Shaft Advisory · Next Steps
The data is ready.
The fitting is next.
The fitting is next.
The directional case for the Fujikura Axiom 105 is sound. One LM session with real Pro V1s and a back-to-back shaft comparison will confirm or revise the hypothesis — and protect the investment.
Step 1Outdoor LM session — Pro V1 Left Dots, Mevo+, 20 × 7-iron with shot tagging.
Step 2Instructor session — AoA and impact position audit. Rule out mechanics.
Step 3Fitting session — hit Dart 94g, Dart V 105, and Axiom 105 back-to-back. Compare dispersion, not averages.
Step 4Decision — buy and install Axiom 105 if fitting data confirms the hypothesis. Keep Dart 94g for one round as fallback.
anthonybest.com · Iron Shaft Advisory Series · 2026