STONE Spider Adapter for THM M3 Crank: 104BCD Conversion, 52mm Boost Chainline, 3mm Offset
This STONE spider adapter converts the THM M3 MTB crank to the widely used 104BCD chainring mounting standard, opening up a much broader selection of single speed and narrow wide chainrings for 1x drivetrains.
Compatibility
This adapter is designed exclusively for the combinations listed below. It does not fit other crank models or chainring standards.
| Compatible Item | Details |
|---|---|
| Crank | THM M3 MTB crank only |
| Chainrings | 104BCD single speed chainrings |
| Chainrings | Single 104BCD MTB chainrings (including narrow wide) |
Product Specifications
- Type: Spider adapter / chainring converter
- BCD: Converts to 104BCD
- Drivetrain compatibility: Single speed / 1x drivetrain
- Model: Boost model
- Install chainline: 52mm
- Offset: 3mm
- Color: Black
- Thickness: 6mm
- Weight: 46g
- Material: High-strength aluminum 7075-T651
- Material hardness: HB150
- Surface treatment: Anodized, high-speed CNC machined
Package Includes
1 × chainring spider adapter
Product Features
- Converts the THM M3 MTB crank to 104BCD chainring mounting
- Designed for single speed and 1x MTB drivetrain setups
- Works with single 104BCD narrow wide chainrings
- Boost model with a 52mm install chainline
- 3mm offset design for appropriate chainline adjustment
- Made from 7075-T651 aluminum alloy for high strength and stiffness
- Black anodized surface for wear resistance and corrosion protection
Advantages
1. THM M3 to 104BCD Conversion
By converting the THM M3 MTB crank to the common 104BCD standard, this adapter gives you access to a far wider range of chainring options.
2. Boost Chainline Design
The Boost model features a 52mm install chainline with a 3mm offset, making it suitable for compatible MTB drivetrain setups.
3. High-Strength Material
Machined from high-strength 7075-T651 aluminum alloy for dependable stiffness, strength, and long-term durability.
4. Precision CNC Machining
High-speed CNC machining combined with an anodized finish delivers accurate fitment and lasting surface protection.
