STONE Rotor to 104BCD Chainring Spider Adapter
Compatibility
- Fit for ROTOR 30mm spindle cranksets before 2018.
- Compatible with 104BCD narrow wide single chainrings.
- Designed for single speed / 1x drivetrain use.
Important Compatibility Note
- Not compatible with ROTOR 24mm spindle cranksets.
- Not compatible with ROTOR 2018 and new crank models.
- Not compatible with Shimano direct mount systems.
- Not compatible with SRAM direct mount systems.
Specifications
Brand: STONE
Product Type: Chainring Spider Adapter / Chainring Converter
Application: Rotor to 104BCD single chainring conversion
Material: High-strength AL7075-T651 aluminum
Material Hardness: HB150
Surface Treatment: Anodized
Process: High-speed CNC machining
Color: Black
BCD: 104BCD
Offset: 5mm
Thickness: 6mm
Product Features
1. Rotor to 104BCD Conversion
Converts compatible ROTOR 30mm spindle cranksets to the standard 104BCD chainring system for wider chainring compatibility.
2. 5mm Offset Design
The 5mm offset helps optimize chainline for single chainring drivetrain setups.
3. AL7075-T651 Aluminum
Made from high-strength 7075-T651 aluminum for excellent stiffness, durability, and lightweight performance.
4. CNC Machined Precision
High-speed CNC machining provides accurate fitment and stable chainring installation.
5. Anodized Black Finish
Anodized surface treatment improves wear resistance and gives the adapter a clean, durable finish.
Package Includes
Chainring and bolts are not included.



