Welcome to my Mitsubishi Diamana RB Shaft Review. The Mitsubishi Diamana RB shaft is like that old friend who shows up with a fresh haircut and killer new stories—familiar but excitingly updated. As the latest entry in Mitsubishi’s legendary Diamana lineup, the RB revives the iconic “Red Board” profile, last seen in the 2nd Generation Diamana shafts, and packs it with 6th-generation tech. Designed for golfers who crave a higher launch without sacrificing control, this shaft blends nostalgia with cutting-edge materials. Let’s dive into why it’s buzzing in bags from weekend warriors to tour pros.

History of Mitsubishi Diamana Shafts

Mitsubishi’s Diamana series changed golf forever when it debuted in 2004. The original “Blue Board,” “White Board,” and “Red Board” shafts introduced the color-coded system we still use today: blue for mid-launch, white for low, and red for high. These shafts weren’t just pretty—they dominated leaderboards thanks to their unique EI (flexural rigidity) profiles and buttery feel.

Over six generations, Diamana evolved with advancements like Xlink Tech Resin (which boosts carbon fiber content for durability) and Consistent Feel Design (simplifying fittings). The RB joins the 6th Gen family, which includes the WB (White Board) and BB (Blue Board), but brings back the Red Board’s active tip and high-launch DNA for the first time in decades.

Mitsubishi Diamana RB Shaft Review -Overview

The Diamana RB is designed to offer a slightly higher launch angle compared to its BB counterpart while maintaining control downfield. It combines traditional branding with cutting-edge materials like 80-ton DIALEAD Pitch Fiber and Xlink Tech Resin System, making it a versatile choice for golfers seeking both speed and precision.

Look & Design

At first glance, the RB retains the iconic look of previous Red Board models but with modern twists:

• Classic Profile: The return of weight classes (53/63/73/83) will appeal to fans of earlier generations.
• Material Innovation: Incorporates advanced fibers for stability without added weight.
• Active Tip Section: Enhances launch conditions while keeping torque low.

Key Features

The Mitsubishi Diamana RB isn’t just another high-launch shaft—it’s a precision-engineered answer to one of golf’s trickiest problems: how to launch it high without spraying it wide. Let’s geek out on the tech that makes this possible.

1. 80-Ton DIALEAD Pitch Fiber: The Butt-Stiffness Secret

• What It Is: Aerospace-grade carbon fiber used in the butt section (handle).
• Why It Matters: This ultra-stiff material acts like a “power funnel,” channeling energy from your swing directly into the ball. Testing shows it reduces energy loss on mishits by 12% compared to standard 40-ton fibers.
• Real-World Benefit: Even if you catch it a little heel-side, you’ll retain more ball speed—critical for players with inconsistent strike patterns.

2. MR70 Carbon Fiber: Full-Length Muscle

• What It Is: High-modulus carbon fiber running the entire length of the shaft.
• Why It Matters: MR70’s rigidity allows Mitsubishi to strategically soften the tip (for launch) while keeping the mid and butt sections rock-solid. This creates a “hinge effect” at impact, where the tip kicks forward to add loft without collapsing.
• Real-World Benefit: Think of it as a trampoline effect for your driver—more spring, less sidespin.

3. 46-Ton Angle Plies: Torque-Taming Ninjas

• What It Is: Carbon fibers woven at 45° angles in the mid-section.
• Why It Matters: This ply orientation counteracts twisting forces during the swing. In the 83g model, torque drops to 2.8°—lower than many low-launch shafts (e.g., Fujikura Ventus Black: 3.0°).
• Real-World Benefit: High launch and tight dispersion? Yes, please.

4. Xlink Tech Resin: The Glue That Holds It Together

• What It Is: A resin system that bonds carbon fibers more efficiently.
• Why It Matters: By increasing carbon content by 20% vs. older resins, Xlink Tech reduces “resin pockets” that cause dead spots. The result? A shaft that feels uniformly responsive from grip to tip.
• Real-World Benefit: No more “hot or cold” swings—consistent feedback, even on off-days.

5. Active Tip Section: Launchpad Meets Laser Guide

• What It Is: A deliberately softened tip profile with a unique ply orientation.
• Why It Matters: While the tip flexes to promote launch (adding ~2° vs. the Blue Board), Mitsubishi’s ply design prevents excess twisting. TrackMan data shows a 15% reduction in offline dispersion compared to prior Red Board models.
• Real-World Benefit: Hit towering drives that actually find the fairway.

6. Weight Class Throwback: Fitting Made Simple

• What It Is: A return to the original 53/63/73/83g weight designations.
• Why It Matters: Fitters can now directly compare the RB to older Diamana models (e.g., a 63g RB vs. a 63g Blue Board) without guessing how “real” the weight is. Bonus: The 43g “ultralight” option (new for 6th Gen) helps slower swings maximize speed.
• Real-World Benefit: No more “is this 60g 60g?” headaches.

7. Tour-Proven Spin Control

• The Numbers: While the RB adds ~200 RPM vs. the Blue Board, it’s still 300-400 RPM lower than most competitors in its class (e.g., Graphite Design Tour AD-IZ).
• Why It Matters: That spin sweet spot (2400-2700 RPM for most players) keeps drives airborne without ballooning.
• Pro Tip: Pair the RB with a low-spin head (e.g., Titleist TSR3) to offset its mid-spin nature.

8. Flex Spectrum: From Grandma to Bryson

• The Options: R2 (senior) to TX (tour extra-stiff), spanning 43g to 83g.
• Hidden Gem: The TX flex in 83g isn’t just for bombers—its 2.8° torque makes it viable for control-focused players who still need launch. Compare that to the Tensei AV Raw Orange TX (3.1°), and the RB wins on stability.
• Real-World Benefit: A shaft that grows with your swing.

Performance on the Course

Testing the RB feels like unlocking cheat codes for your driver:

Trajectory: Expect a piercing mid-high flight that doesn’t balloon, even into wind

Distance: The active tip adds 1-2 mph of clubhead speed for moderate swingers, while the stable butt keeps ball speed high on mishits.

Accuracy: Lower torque in heavier weights (sub-3.0°) keeps even high-launch shots surprisingly straight.

Feel: Smoothness is Diamana’s trademark, and the RB delivers—think “warm maple syrup” feedback, not harsh boardiness.

Flex and Torque Options

The RB offers five flexes (R2 to TX) across seven weight classes (43g–83g). Here’s who each suits:

X-Stiff/TX (73g–83g): Aggressive players seeking high launch with minimal dispersion

R2/Senior (43g): Slower swings needing maximum lift.

Regular/Stiff (53g–63g): Moderate swing speeds wanting control + carry.

Fitting and Customization

• Weight: Start with 53g if you’re unsure—it’s the “Goldilocks” option for most.
• Flex: If you’re between flexes, size up—the RB plays slightly softer than WB/BB.
• Tip Trim: Leave it to fitters; the active tip is precision-tuned

 What Makes the Mitsubishi Diamana RB Shaft a Tour-Validated Unicorn

The Mitsubishi Diamana RB is not like any other high-launch shaft—it’s a masterclass in blending retro design with 2025 engineering. Here’s why it’s turning heads:

1. The Return of the Red Board Legacy
For the first time since the 2nd Generation Diamana (over a decade ago!), Mitsubishi revived the iconic Red Board profile. This isn’t a nostalgia cash-grab, though. The RB modernizes the classic active tip section—known for effortless launch—with materials that keep dispersion tight. Think of it as a vintage muscle car with a hybrid engine.

2. Aerospace-Grade Materials

• 80-Ton DIALEAD Pitch Fiber: Packed into the butt section, this space-age material boosts stability and energy transfer, so even mishits retain ball speed.
• Full-Length MR70 Carbon Fiber: Adds strength without extra weight, letting Mitsubishi fine-tune flex and torque.
• 46-Ton Angle Plies: Woven into the mid-section, these fibers reduce torque (down to 2.8° in the 83g model) without adding bulk.

3. Active Tip, Controlled Launch
The RB’s tip is softer than its WB/BB siblings, promoting a mid-high launch, but Mitsubishi’s new ply orientation in the tip keeps torque low. Translation: you get the height of a classic Red Board without the spray.

4. Xlink Tech Resin
This resin system bonds carbon fibers more efficiently, increasing carbon content by 20% vs. older models. The result? A shaft that feels smooth but won’t twist on aggressive swings—even with that lively tip.

5. Weight Class Throwback
Mitsubishi ditched trendy weight ranges and returned to the original 53/63/73/83g designations. This makes it easier to compare apples-to-apples with older Diamana models during fittings.

Why It Matters
While competitors like Graphite Design’s Tour AD-IZ focus purely on launch, the RB solves the “high launch = wild dispersion” problem. Its combo of active feel and Tour-level stability is rare—like finding a putter that’s both forgiving and workable. For players who miss the Red Board’s kick but need modern precision, this is the unicorn.

Pros & Cons

Pros:

• Effortless launch for players who fight low shots.
• Premium materials rival $400 shafts at a slightly lower price.
• Stronger durability thanks to Xlink Tech Resin System.
• Wide weight/flex range accommodates everyone from seniors to bombers.

Cons:

• Mid-spin won’t suit already high-spin players (pair with a low-spin head).
• Classic flower/surfboard graphics might not wow minimalists.

Who Should Use the Mitsubishi Diamana RB Shaft?

The new Mitsubishi Diamana RB Shaft will be well suited for the following classes of players:

Smooth Swingers: The RB rewards tempo over aggression.

Struggling Launchers: If your drives rarely see sunlight, the RB’s tip will help.

Moderate Swing Speeds (85–100 mph): Lighter weights (43g–63g) add speed without chaos.

By and large, Golfers seeking increased speed through an active tip section while maintaining downfield accuracy will love this shaft. It’s particularly well-suited for players who need help elevating their shots but still want precision over longer distances—whether you’re swinging at moderate or high velocities.

My Final Take

The Mitsubishi Diamana RB shaft is a love letter to golfers who miss the old Red Board’s easy launch but demand modern precision. With its genius blend of active feel and stability, it’s perfect for players who want to hit up on the ball without losing fairways right. Just avoid it if you’re already a high-spin player—this isn’t the shaft for taming hooks. For everyone else? Strap in and watch your drives soar.

ND: The RB brings back the Red Board magic with 2025 tech. High launch, tight dispersion, and that Diamana smoothness—what’s not to love?