STONE Direct Mount Chainring for Cannondale SI/SL/SISL/SISL2 & FSA Comet/Afterburner Cranks – 3mm Offset, 30–40T, Hollow/Aero, 7075 Aluminum
The STONE Direct Mount Chainring is designed for SI, SL, SISL, and SISL2 cranksets and is compatible with FSA Comet and Afterburner crank interfaces, making it a versatile upgrade for road, gravel, and MTB-style 1x drivetrains.
Machined from high-stiffness 7075-T651 aerospace-grade aluminum, it delivers excellent strength, precise fitment, and reliable chain retention with standard 9–12 speed chains.
Choose between Hollow and Aero styles, with tooth options from 30T to 40T to match your gearing needs.
Specifications
| Item | Details |
|---|---|
| Brand | STONE |
| Material | Aerospace-grade Aluminum 7075-T651 |
| Mount Type | Direct Mount |
| Offset | 3mm inner offset |
| Color Options | Black / Silver |
| Chainring Style | Hollow / Aero |
| Chain Compatibility | Standard 9 / 10 / 11 / 12-speed chains |
| Not Compatible With | SRAM AXS Flattop T-Type 12S chain |
| Crank Compatibility | SI / SL / SISL / SISL2, FSA Comet / Afterburner |
| Thickness | 6.7mm |
| Hardness | HB150 |
| Machining Precision | 0.03mm |
| Tooth Options | 30T / 32T / 34T / 36T / 38T / 40T |
Compatibility
This chainring is designed to fit the following cranksets and interfaces:
| Crank / Interface | Compatible |
|---|---|
| SI | Yes |
| SL | Yes |
| SISL | Yes |
| SISL2 | Yes |
| FSA Comet | Yes |
| FSA Afterburner | Yes |
It works with standard 9-speed, 10-speed, 11-speed, and 12-speed chains.
Important Notice
This chainring does not support SRAM AXS Flattop T-Type 12-speed chains. Please confirm your crank model and chain type before placing an order.
Weight Reference
Weights may vary slightly depending on production tolerance and tooth size.
| Teeth | Aero Style Weight | Hollow Style Weight |
|---|---|---|
| 30T | 60g | 56g |
| 36T | 85g | 72g |
| 40T | 100g | 85g |
Product Advantages
High-Strength 7075-T651 Aluminum
Made from 7075-T651 aerospace-grade aluminum, this chainring provides:
- High stiffness
- Excellent durability
- Strong impact resistance
- Low weight
- Reliable long-term performance
Precision CNC Machining
Each chainring is manufactured with CNC machining accuracy of 0.03mm, ensuring:
- Accurate crank fitment
- Smooth chain engagement
- Stable drivetrain operation
- Consistent riding performance
Narrow-Wide Tooth Design
The narrow-wide tooth profile improves chain retention and reduces the risk of chain drop during riding.
It also sheds mud and dirt more effectively, supporting smoother and more reliable drivetrain performance.
Package Includes
- 1 × STONE Direct Mount Chainring
