The STONE MT-002 is a high-strength CNC-machined mountain bike crankset designed for aggressive trail, enduro, all-mountain and downhill riding. Made from premium 7050-T7451 aluminum crank arms and a 7075-T651 aluminum axle, it delivers an excellent balance of stiffness, durability and lightweight performance.

With a SRAM 3-bolt direct mount interface, multiple crank arm lengths, and Standard / WIDE / DH axle options, the MT-002 offers wide compatibility for modern MTB drivetrains.

Key Features

1. Premium Aluminum Construction

The crank arms are made from 7050-T7451 aluminum alloy, offering excellent corrosion resistance, crack resistance and long-term reliability.

The axle is made from 7075-T651 aluminum, known for high strength and hardness, with tensile strength up to approximately 520 MPa.

2. Precision CNC Machining

Each crankset is manufactured using precise CNC machining for consistent quality, accurate fitment and reliable performance.

The refined surface and clean machining lines give the crankset a premium appearance while helping maintain structural strength.

3. SRAM 3-Bolt Direct Mount Interface

The MT-002 uses a 3-bolt direct mount interface, compatible with SRAM-style 3-bolt direct mount chainrings and spider adapters.

It supports multiple setup options, including:

• 3-bolt direct mount chainring
• 3-bolt spider adapter to BCD140
• 3-bolt power meter spider adapter to BCD140

4. Standard / WIDE / DH Axle Options

Available with different axle options to suit various MTB frame and drivetrain standards:

• Standard Axle— default we send this version
• WIDE Axle
• DH Axle

This allows better compatibility with standard MTB setups, wide chainline drivetrains and downhill bike frames.

Please note default we send standard spindle version.

5. Anodized Surface Finish

The crankset surface is anodized to help prevent oxidation and discoloration over long-term use.

Available colors:

• Black
• Silver

6. Tested for Strength and Durability

The crankset structure has been optimized through long-term fatigue testing.

Tested according to GB/T 3565.8-2022 competition-level standards:

• 45° / 1800N / 100,000 cycles
• 30° / 1800N / 70,000 cycles

Built for demanding MTB riding conditions.

Specifications

Crank Arm Length & Weight

Note: The listed weight is based on the Standard axle version. WIDE and DH versions may add approximately 3–5 g.

Axle Selection Guide

Standard Axle — 128 mm

• Q-Factor: 168 mm
• Suitable for standard BSA 68–73 mm bottom bracket shells
• Commonly used with standard SRAM DUB-style MTB crank setups

WIDE Axle — 134 mm

• Q-Factor: 174 mm
• 6 mm longer than the Standard axle
• Suitable for SRAM GX / X0 / XX / XX SL Transmission-style wide chainline setups
• Requires additional spacer setup depending on frame and bottom bracket

DH Axle — 143 mm

• Q-Factor: 183 mm
• 15 mm longer than the Standard axle
• Suitable for DH-style frames and wider bottom bracket setups
• Compatible with BSA 83 mm downhill bottom bracket applications

Package Includes

• 1 × Right Crank Arm
• 1 × Left Crank Arm
• 1 × Axle
• 2 × Pedal Washers
• 1 × 4.5 mm Spacer
• 3 × 3-Bolt Screws
• 1 × Grease

Compatibility Notes

This crankset is designed for mountain bikes and is compatible with SRAM-style 3-bolt direct mount chainrings.

Please check your frame bottom bracket standard, chainline requirement and axle option before purchase.

Compatible setup options include:

• BSA 68 / 73 mm
• BSA 83 mm DH
• BB30-73
• PF30-73
• PF 89.5
• PF 92

Spacer configuration may vary depending on frame and bottom bracket type.

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