STONE Oval Narrow-Wide Chainring for Rotor 30mm Cranks (REX 1.1, REX 2.1, 3D+ XC2, 3DF XC2), 5 mm Offset, 30T–38T
This STONE oval narrow-wide chainring is designed for Rotor 30mm spindle cranks, including REX 1.1 and REX 2.1. Its updated narrow-wide tooth profile keeps the chain more secure, sheds mud better, and runs more quietly on rough off-road terrain. Machined from high-strength 7075-T651 aerospace-grade aluminum, it combines stiffness, durability, and low weight in one direct-mount chainwheel.
Specifications
| Item | Details |
|---|---|
| Material | Aerospace-grade aluminum 7075-T651 |
| Color | Black anodized |
| Offset | 5 mm |
| Thickness | 9 mm |
| Hardness | HB150 |
| Speed compatibility | 9 / 10 / 11 / 12 speed (not for AXS flattop chain) |
| Processing | High-precision CNC machining |
| Machining accuracy | 0.03 mm |
Compatibility
This chainring fits the following Rotor 30mm spindle cranks:
| Crank model | Compatible |
|---|---|
| Rotor REX 1.1 (30mm spindle) | Yes |
| Rotor REX 2.1 (30mm spindle) | Yes |
| Rotor 3D+ XC2 (30mm spindle) | Yes |
| Rotor 3DF XC2 (30mm spindle) | Yes |
| Rotor R-Hawk | No |
| Rotor R-Raptor | No |
It supports 9, 10, 11, and 12 speed standard chains. It is not suitable for SRAM AXS flattop chains or T-type transmission chains.
Features
- New STONE narrow-wide tooth design for enhanced chain retention
- Reduces the risk of chain drop on rough terrain
- Improved self-cleaning performance in muddy or dirty conditions
- Designed to reduce drivetrain noise
- CNC-machined for a precise fit and smooth performance
- Black anodized finish for corrosion resistance and a clean look
Advantages
Premium Material
Cut from high-strength 7075-T651 aluminum, delivering excellent stiffness, durability, and a long service life.
Precision CNC Machining
Manufactured with high-precision CNC processing and a working accuracy of 0.03 mm, ensuring a precise fit and reliable performance.
Package Includes
- 1 × bike chainring
