Product Description

Grade 5 Titanium Crank Bolt & Cap Upgrade for SRM PM9 Power Meter Cranks

Designed specifically for SRM PM9 power meter crank systems, the S-PARTS titanium crank bolt and cap kit provides a lightweight, high-strength replacement solution for the original crank fastening components.

Manufactured from Grade 5 Titanium (Ti-6Al-4V), this kit delivers an exceptional strength-to-weight ratio, combining high mechanical performance with significant weight reduction compared with traditional steel hardware.

Every component is precision CNC-machined to ensure accurate thread engagement, consistent installation torque, and reliable performance under demanding cycling conditions.

Asymmetric Drive Side & Non-Drive Side Engineering Design

Unlike standard crank hardware with unnecessary material on both sides, S-PARTS optimized the structure according to the different mechanical requirements of the SRM PM9 system.

Drive Side (Right Side / Chainring Side)

The drive side is engineered with a reinforced structure to handle higher tightening loads and repeated service cycles.

According to SRM crank specifications, the drive-side crank cap requires a tightening torque of 40Nm.

A stronger, more conservative design ensures excellent durability and reliable clamping performance during high-power cycling.

Non-Drive Side (Left Side)

The non-drive side is optimized specifically for weight reduction.

Because the non-drive side requires only 5Nm tightening torque, S-PARTS removed unnecessary material through internal CNC hollowing and structural optimization around the inner ring and threaded area.

This design reduces weight while maintaining the required strength and functional reliability.

Complete 8-Piece Kit Includes

• 2 × Self-Extracting Crank Inserts (Threaded)
• 2 × Self-Extracting Crank Inserts (Non-Threaded)
• 2 × Crank Locking Bolts
• 1 × Drive-Side Crank Cap (Right Side)
• 1 × Non-Drive-Side Crank Cap (Left Side)

Total: 8 pieces/set

Weight:

Approx. 31.9g per set

Premium Grade 5 Titanium Construction

Material:

Grade 5 Titanium (Ti-6Al-4V)

Also known as:

Ti-6Al-4V Titanium Alloy

Features:

• High strength-to-weight ratio
• Excellent corrosion resistance
• Lightweight performance upgrade
• Suitable for premium cycling components

Average tensile strength:

Over 1050 MPa

This provides mechanical performance comparable to many high-strength steel fasteners while achieving approximately 50% weight reduction.

Precision CNC Manufacturing

Each component is produced through:

• Multi-axis precision CNC machining
• Tight dimensional tolerance control
• Optimized thread machining process
• Custom forged titanium head forming

Precision manufacturing ensures smooth installation, accurate torque application, and long-term reliability.

Premium Surface Finishes

Available colors:

• Gold
• Black
• Blue
• Rainbow
• Titanium
• Green
• Purple
• Candy
• Indigo

PVD Vacuum Coating

Gold / Black / Blue / Rainbow

Features:

• Dense protective surface layer
• Increased surface hardness
• Improved wear resistance
• Long-lasting metallic appearance

Titanium Anodized Finish

Green / Purple / Candy / Indigo

Uses controlled oxidation to create different colors through titanium oxide layer thickness and light reflection.

Features:

• Dye-free coloration
• Enhanced corrosion resistance
• Unique titanium finish

Torque Specifications

Designed for SRM PM9 crank requirements:

• Drive Side Crank Cap (Right): 40Nm
• Non-Drive Side Crank Cap (Left): 5Nm

Recommended installation tools:

• 10mm Hex Key
• T30 Torx Wrench

Key Features

• Designed for SRM PM9 power meter crank systems
• Grade 5 Titanium (Ti-6Al-4V) construction
• Lightweight 31.9g complete kit
• CNC precision-machined components
• Optimized drive-side / non-drive-side structure
• High corrosion resistance
• Premium PVD and anodized finishes
• Reliable torque retention for high-performance cycling