Stone Chainring Adapter Spider: Convert Shimano Direct Mount MTB Cranksets (M6100–M9130) to 104BCD with 3mm/6mm Offset
This adapter spider converts a Shimano Direct Mount MTB crankset to a 104BCD chainring setup, with selectable 3mm or 6mm offset for flexible chainline tuning and frame clearance.
This chainring adapter spider is designed for Shimano Direct Mount MTB cranksets. It converts Shimano direct mount cranks to 104BCD chainring compatibility, allowing riders to mount standard 104BCD MTB chainrings.
The spider supports 3mm and 6mm offset installation, so you can fine-tune the chainline and frame clearance to match your drivetrain and frame.
Compatibility
The adapter fits the following Shimano MTB cranksets:
- M6100 / M6120 / M6130
- M7100 / M7120 / M7130
- M8100 / M8120 / M8130
- M9100 / M9120 / M9130
It is compatible with 104BCD MTB chainrings.
Offset Design
Offset options: 3mm / 6mm / negative (installed outward).
- Install the lock ring on one side to obtain 3mm offset.
- Install it on the other side to obtain 6mm offset.
For larger chainrings, the adapter can be installed outward to help improve frame clearance.
Specifications
| Brand | Stone |
|---|---|
| Product Type | Chainring Adapter Spider / Converter |
| Crank Interface | Shimano Direct Mount |
| Chainring BCD | 104BCD |
| Offset | 3mm / 6mm |
| Material | 7075-T651 Aluminum Alloy |
| Material Hardness | HB150 |
| Color | Black / Silver |
| Surface Treatment | Anodized |
| Machining | High-Speed CNC |
| Weight | approx. 57g |
Package Includes
- 1 × Chainring Adapter Spider
- 1 × Washer
Advantages
1. High-Strength Aluminum
Made from 7075-T651 aluminum alloy, offering excellent stiffness, strength, and a long service life.
2. Precision CNC Machining
High-precision CNC machining with working accuracy up to 0.03mm ensures accurate fitment and stable riding performance.
3. 104BCD Conversion
Converts Shimano direct mount cranksets to 104BCD, giving riders access to a wider range of chainring options.
4. Adjustable Offset
Supports 3mm and 6mm offset installation to suit different chainline and clearance needs.
Installation Notice
Please check your crank model, chainring BCD, offset requirement, and frame clearance before purchase.
This adapter is only for compatible Shimano Direct Mount MTB cranksets and 104BCD chainrings.
Professional installation is recommended.
