STONE Direct Mount Chainring 30-40T for Cannondale SI SL SISL SISL2 and for FSA Comet Afterburner, 3mm Inner Offset

STONE Direct Mount Chainring 30-40T for Cannondale SI SL SISL SISL2 and for FSA Comet Afterburner, 3mm Inner Offset

STONE Direct Mount Chainring for SI / SL / SISL / SISL2 & F-S-A Comet Afterburner — 3mm Inner Offset Hollow / Aero 30T–40T

The STONE Direct Mount Chainring is designed for SI, SL, SISL, SISL2 cranksets and compatible F-S-A Comet / Afterburner crank interfaces.

Made from high-stiffness 7075-T651 aerospace-grade aluminum, it offers excellent strength, precise fitment, and reliable chain retention for road, gravel, and MTB-style drivetrain setups using standard 9–12-speed chains.

Available inHollow and Aero styles, with tooth options from 30T to 40T.

Specifications

Compatibility

This chainring is designed to fit the following cranksets and interfaces:

• For SI
• For SL
• For SISL
• For SISL2
• For F-S-A Comet
• For F-S-A Afterburner

It works with standard 9-speed, 10-speed, 11-speed, and 12-speed chains.

Important Notice

This chainring does not support for SRAM AXS Flattop 12/13-speed T-Type 12-speed chains.

Please confirm your crank model and chain type before placing an order.

Chainring Style Options

Hollow Style

The Hollow style is designed for riders who prefer a lighter structure and quieter drivetrain performance.

• Lighter appearance and lower weight
• Less chain noise than Aero style
• Suitable for daily riding, gravel, road, and MTB use
• Balanced stiffness and weight

Aero Style

The Aero style features a solid full-face design for stronger rigidity and a more integrated appearance.

• Higher rigidity
• Clean integrated look
• Slight aerodynamic advantage
• Strong visual style

Weight Reference

Weights may vary slightly depending on production tolerance and tooth size.

Product Advantages

1. 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

2. 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

3. Narrow-Wide Tooth Design

The Narrow-Wide tooth profile helps improve chain retention and reduce the risk of chain drop during riding.

It also helps clear mud and dirt more effectively, supporting smoother and more reliable drivetrain performance.

Package Includes

• 1 × STONE Direct Mount Chainring

Available Options

Each row below is one available option combination. Choose the complete combination that matches your setup.