Product Description

The S-PARTS Titanium Crank Arm Bolt & Cap Set is an OEM+ performance upgrade engineered for SRAM DUB drivetrain systems, delivering a perfect balance of structural reliability, weight reduction, and factory-level integration.

Designed for SRAM DUB, Quarq, RED, and Force cranksets, this system ensures secure crank arm fixation under high torque loads while maintaining a clean, original-equipment visual profile.

Unlike generic replacement hardware, this set is developed as a performance-grade mechanical upgrade, offering enhanced strength-to-weight efficiency while preserving full OEM installation compatibility.

Each component is manufactured using multi-axis CNC machining with micron-level precision control, ensuring smooth threading, stable torque retention, and long-term mechanical consistency under real-world riding stress.

Key Specifications

• Product Type: Crank Arm Bolt & Self-Extracting Style Cap Set (OEM+ Performance Design)
• Compatibility: SRAM DUB system (Quarq / RED / Force cranksets)
• Material: Aerospace-grade Ti-6Al-4V Titanium Alloy (Grade 5 / S-Grade TC4 equivalent)
• Total Weight: ≈ 13.6g per set

Torque & Thread Specs ⚠️ CRITICAL

• Main Crank Bolt: 50Nm (Right-hand thread → tighten clockwise)
• Outer Cap: 3Nm ONLY (Left-hand / Reverse thread)

⚠️ WARNING – THREAD DIRECTION

• INSTALL (tighten): COUNTER-CLOCKWISE
• REMOVE (loosen): CLOCKWISE

Incorrect direction or over-torque may cause irreversible thread damage.

• Tool Compatibility: PARK TOOL SPA-2 or equivalent
• Design Style: OEM+ factory-matching integrated appearance

Advanced Manufacturing & Engineering

Every component is produced through a controlled high-temperature forging process at 650°C, using exclusive S-PARTS tooling designed for structural consistency.

To maintain absolute precision:

• Each forging die is retired after no more than 300 production cycles
• Components are finished on military-grade CNC machining centers
• Thread tolerances are controlled at micron-level accuracy

The result is a component system engineered for long-term durability, repeatable torque stability, and professional-grade mechanical fit.

Material Performance

Machined from aerospace-grade Ti-6Al-4V titanium alloy (Grade 5), this system delivers elite mechanical performance:

• Strength-to-weight ratio significantly higher than steel hardware
• Typical tensile strength exceeding 1050 MPa (batch-dependent), surpassing industry benchmark levels (~895 MPa class)
• Approx. 50% weight reduction compared to steel equivalents
• Excellent fatigue resistance under repeated torque cycling
• Full corrosion resistance in all-weather environments

This combination makes it a true performance upgrade component, suitable for road, gravel, and MTB systems where reliability and weight efficiency both matter.

Surface Engineering & Laser Marking

S-PARTS applies dual premium finishing systems depending on color option:

Vacuum Nitriding Coating (Gold / Black / Blue / Titanium)

Deep molecular bonding into the titanium surface, delivering:

• High wear resistance
• Long-term color stability
• Enhanced surface hardness

Anodized Titanium Finish (Indigo / Candy / Green / Purple)

Electrochemical oxidation creates:

• Vibrant color expression
• Iridescent visual depth
• Lightweight, durable surface finish

Precision Laser Engraving

Each cap features high-precision laser marking, including:

• “DUB SYSTEM” identification
• Torque specification markings (50Nm / 3Nm)
• “AERODYNAMICS EDITION” branding detail

Designed to deliver a professional, factory-level cockpit appearance with technical clarity.

Key Advantages

• OEM+ performance upgrade for SRAM DUB systems
• Aerospace-grade titanium construction (Ti-6Al-4V)
• 650°C precision forging process with controlled die lifecycle
• CNC micron-level machining for perfect fitment
• High torque stability under real riding conditions
• Corrosion-proof for all-weather cycling
• Clean OEM-matching aesthetic with laser-etched detailing