STONE MT-002 MTB Crankset: CNC 7050-T7451 Aluminum Arms, SRAM 3-Bolt Direct Mount, Standard / WIDE / DH Axles (150–175 mm)
The STONE MT-002 is a high-strength, CNC-machined mountain bike crankset designed for aggressive trail, enduro, all-mountain and downhill riding. Its 7050-T7451 aluminum crank arms and 7075-T651 aluminum axle deliver a balanced combination of stiffness, durability and low weight.
With a SRAM 3-bolt direct mount interface, six crank arm lengths from 150–175 mm, and Standard / WIDE / DH axle options, the MT-002 adapts to a wide range of modern MTB drivetrains and frame standards.
Key Features
1. Premium Aluminum Construction
The crank arms are machined from 7050-T7451 aluminum alloy, which offers excellent corrosion resistance, crack resistance and long-term reliability.
The axle is made from 7075-T651 aluminum, a material known for high strength and hardness, with a tensile strength of approximately 520 MPa.
2. Precision CNC Machining
Every crankset is produced with precise CNC machining for consistent quality, accurate fitment and dependable performance.
The refined surface and clean machining lines give the crankset a premium appearance while preserving 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.
Supported setup options include:
- 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
Three axle options are available to suit different MTB frame and drivetrain standards:
- Standard Axle — default version shipped
- WIDE Axle
- DH Axle
This allows better compatibility with standard MTB setups, wide chainline drivetrains and downhill frames.
Please note: the Standard spindle version is sent by default.
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.
Testing follows the GB/T 3565.8-2022 competition-level standard:
- 45° / 1800N / 100,000 cycles
- 30° / 1800N / 70,000 cycles
Built to handle demanding MTB riding conditions.
Specifications
Full technical specifications of the STONE MT-002 crankset are listed below.
| Item | Specification |
|---|---|
| Brand | STONE |
| Model | MT-002 |
| Type | MTB Crankset |
| Crank Arm Material | 7050-T7451 Aluminum Alloy |
| Axle Material | 7075-T651 Aluminum Alloy |
| Manufacturing Process | CNC Machining |
| Interface | SRAM 3-Bolt Direct Mount |
| Axle Diameter | 28.99 mm |
| Axle Options | Standard / WIDE / DH |
| Q-Factor | 168 mm / 174 mm / 183 mm |
| Chainline | 52 mm |
| Offset | 3 mm inward offset |
| Standard | GB/T 3565.8-2022 |
| Warranty | 1 Year, non-human damage |
| Color | Black / Silver |
| Application | MTB / Trail / Enduro / All-Mountain / DH |
Crank Arm Length & Weight
The MT-002 is available in six crank arm lengths, each with its corresponding weight.
| Crank Arm Length | Weight |
|---|---|
| 150 mm | 537.2 g |
| 155 mm | 542.4 g |
| 160 mm | 555.5 g |
| 165 mm | 563.5 g |
| 170 mm | 573.8 g |
| 175 mm | 585.9 g |
Note: The listed weights are based on the Standard axle version. WIDE and DH versions may add approximately 3–5 g.
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
The MT-002 is designed for mountain bikes and works with SRAM-style 3-bolt direct mount chainrings. Supported bottom bracket standards are summarized below:
| Bottom Bracket Standard | Typical Use |
|---|---|
| BSA 68 / 73 mm | Standard MTB frames (Standard axle) |
| BSA 83 mm DH | Downhill frames (DH axle) |
| BB30-73 | Press-fit / threaded MTB setups |
| PF30-73 | Press-fit MTB setups |
| PF 89.5 | Wide press-fit MTB setups |
| PF 92 | Press-fit 92 mm MTB setups |
Before purchasing, please confirm your frame’s bottom bracket standard, chainline requirement and axle option. Spacer configuration may vary depending on the frame and bottom bracket type.
