STONE Oval Direct Mount Chainring for ROTOR 3D+ / 3DF 24mm Cranks – 30T–38T, 9–12 Speed, Boost 148 Compatible
Upgrade your drivetrain with the STONE Oval Direct Mount Chainring, engineered specifically for ROTOR 24mm axle 3D+ and 3DF cranks. The oval chainring profile works with the narrow-wide tooth design to improve pedaling efficiency, enhance chain retention, and deliver a smoother ride on rough trails.
Machined from 7075-T651 aerospace-grade aluminum, this chainring combines high stiffness, low weight, and long-lasting durability—well suited to MTB, trail, and cross-country riding.
Specifications
| Item | Details |
|---|---|
| Brand | STONE |
| Model | Oval Chainring for ROTOR 24mm Axle 3D+ / 3DF |
| Material | 7075-T651 aerospace-grade aluminum |
| Color | Anodized black |
| Speed compatibility | Standard 9 / 10 / 11 / 12 speed (not compatible with AXS Flattop or T-type chains) |
| Thickness | 9mm |
| Hardness | HB150 |
| Chainline | 52mm |
| Frame compatibility | Boost 148 |
| Tooth options | 30T / 32T / 34T / 36T / 38T |
| Machining accuracy | 0.03mm |
Compatibility
This chainring is designed for the following ROTOR cranks:
- ROTOR 24mm axle 3D+
- ROTOR 24mm axle 3DF
It is suitable for:
- MTB
- Trail riding
- Cross-country riding
- Boost 148 frames
Note: The removal/disassembly tool is sold separately.
Size, Weight & Maximum Diameter
| Teeth | Maximum Diameter | Weight |
|---|---|---|
| 30T | 130mm | 63g |
| 32T | 138mm | 68g |
| 34T | 146mm | 74g |
| 36T | 154mm | 84g |
| 38T | 162mm | 91g |
Product Advantages
High-Strength Aerospace Aluminum
Made from 7075-T651 aluminum supplied by Aleris USA, a trusted aluminum supplier serving major aircraft manufacturers such as Airbus, Boeing, and Bombardier. This material delivers outstanding stiffness, strength, and long-term durability.
High-Precision CNC Machining
Each chainring is CNC-machined with a working accuracy of up to 0.03mm, ensuring precise fitment, stable drivetrain performance, and efficient power transfer.
Enhanced Chain Retention
STONE’s narrow-wide wolf tooth profile grips the chain securely, helping prevent chain drops during intense riding, climbing, and rough terrain.
Cleaner, Quieter Drivetrain
The optimized tooth profile improves self-cleaning performance by helping shed mud, dirt, and debris, while also reducing drivetrain noise.
Package Includes
- 1 × STONE Oval Direct Mount Chainring
Note: The disassembly/removal tool is not included and is sold separately.
