STONE Round Direct Mount Chainring for ROTOR 3D+ / 3DF 24mm Axle Cranksets – 30T–38T Narrow-Wide, 9–12 Speed, Boost 148
Upgrade your drivetrain with the STONE Direct Mount Round Chainring, engineered specifically for ROTOR 24mm axle cranksets, including the ROTOR 3D+ and 3DF models.
CNC-machined from aerospace-grade 7075-T651 aluminum supplied by Aleris USA, this chainring combines excellent stiffness, long-lasting durability, and dependable power transfer. The narrow-wide tooth profile improves chain retention, reduces chain drop, and keeps your drivetrain running smoothly even in demanding conditions.
Offered in Round and Oval styles with tooth options from 30T to 38T, it supports 9 / 10 / 11 / 12-speed drivetrains. Note: not compatible with AXS flattop chains.
Specifications
| Item | Details |
|---|---|
| Brand | STONE |
| Product Name | Round Direct Mount Chainring |
| Fitment | For ROTOR 24mm Axle Crankset |
| Compatible Cranksets | ROTOR 3D+ / 3DF |
| Material | Aerospace-grade 7075-T651 Aluminum |
| Supplier | Aleris USA |
| Color | Black |
| Finish | Anodized |
| Speed Compatibility | 9 / 10 / 11 / 12 Speed (not for flattop or T-type chain) |
| Chainline | 52mm |
| Thickness | 9mm |
| Hardness | HB150 |
| Tooth Profile | Narrow-Wide Tooth |
| Frame Compatibility | Boost 148 |
| Tooth Options | 30T / 32T / 34T / 36T / 38T |
| Style Options | Round |
| CNC Accuracy | 0.03mm |
Compatibility
Crankset Compatibility
This chainring is designed for the following ROTOR 24mm axle cranksets:
- ROTOR 24mm axle cranksets
- ROTOR 3D+
- ROTOR 3DF
Drivetrain Compatibility
Works with:
- 9-speed drivetrain
- 10-speed drivetrain
- 11-speed drivetrain
- 12-speed drivetrain
- SRAM 12-speed standard chain (not for 12s AXS flattop chain)
Frame Compatibility
- Suitable for Boost 148 frames
Important Note
Please confirm your crankset model, axle type, chainline, and required tooth size before purchase.
Narrow-Wide Tooth Design
The STONE chainring features a newly designed wolf-tooth narrow-wide profile that improves riding stability and overall drivetrain performance.
Benefits
- Improves chain retention
- Reduces the risk of chain drop
- Enhances self-cleaning performance in mud and dirt
- Helps reduce drivetrain noise
- Provides smoother, more stable chain engagement
This design is especially valuable for 1x drivetrain setups and off-road riding conditions.
Size and Weight
| Tooth Size | Max Diameter | Weight |
|---|---|---|
| 30T | 130mm | 63g |
| 32T | 138mm | 68g |
| 34T | 146mm | 74g |
| 36T | 154mm | 84g |
| 38T | 162mm | 91g |
Package Includes
- 1 × STONE Bike Chainring or 1 × Installation / Removal Tool
