STONE FC-RD005 Road Bike Crankset: Easton Direct-Mount Interface, TC4 Titanium Spindle, 155–175mm Crank Arms
The STONE FC-RD005 is a high-performance road bike crankset built around an Easton direct-mount interface, 7050-T7451 aluminum CNC-machined crank arms, and a lightweight TC4 titanium spindle. Its geometry follows Shimano road crank standards, delivering a road-standard 148mm Q-factor, 45mm chainline, and eight crank arm lengths spanning 155mm to 175mm.
Offered in black, silver, and purple, the FC-RD005 suits riders who want strength, precision, broad compatibility, and a clean, minimal look.
Key Features
1. Easton Interface Road Crankset
The FC-RD005 uses an Easton direct-mount interface, making it compatible with:
- Easton direct-mount chainrings
- Easton spider adapters
- Easton-style power meter spiders
- STONE chainring spiders and compatible double-chainring setups
This design gives riders flexible drivetrain configuration options for road cycling use.
2. 7050-T7451 Aluminum CNC-Machined Crank Arms
The crank arms are machined from 7050-T7451 aluminum alloy, a material known for high strength, excellent stiffness, and long-lasting durability.
Each crank arm is produced through precision CNC machining, ensuring:
- Accurate dimensions
- Consistent finish
- Reliable structural performance
- A clean, minimal appearance
3. TC4 Titanium Alloy Spindle
The FC-RD005 is equipped with a TC4 titanium alloy spindle that balances low weight, strength, and long-term durability.
Spindle precision:
- Spline symmetry tolerance: within 0.02mm
- Factory roundness tolerance: within 0.01mm
The titanium spindle is engineered to resist impact, deformation, and fatigue under long-term, high-intensity use.
4. Road Standard Geometry
The FC-RD005 is designed around road bike fitment and follows geometry similar to modern Shimano road cranksets.
Main fitment data:
- Spindle diameter: 24mm
- Q-Factor: 148mm
- Chainline: 45mm
- Standard spindle length: 127mm
- Crank inner width: 89.5–91.5mm
- Recommended bottom bracket outer width: max. 91.5mm
It is suitable for standard road bike bottom bracket setups such as BSA68, when paired with compatible 24mm bottom brackets.
5. Multiple Crank Arm Lengths
Available in 8 crank arm lengths to suit different riders and bike fit requirements:
| Crank Length | Weight |
|---|---|
| 155mm | 510.2g |
| 160mm | 519.3g |
| 162.5mm | 523.5g |
| 165mm | 528.3g |
| 167.5mm | 531.1g |
| 170mm | 538.2g |
| 172.5mm | 540.1g |
| 175mm | 544.8g |
Weight may vary slightly due to manufacturing tolerance.
6. Three Color Options
Available colors:
- Black
- Silver
- Purple
The anodized finish delivers a premium appearance and helps improve surface durability.
7. Fatigue Tested Structure
The crankset structure has been optimized through fatigue strength testing.
Manufacturer test results:
- Passed the GB/T 3565.8 competition-level test
- 45° / 1800N / 70,000 cycles
- 30° / 1800N / 100,000 cycles
It is designed for stable performance under demanding road cycling conditions.
8. Precision CNC Manufacturing
STONE uses in-house CNC machining and inspection processes, including precision centering with a Renishaw probe system, to ensure:
- High machining accuracy
- Consistent product quality
- Reliable fit between components
- Stable assembly performance
Specifications
| Item | Specification |
|---|---|
| Brand | STONE |
| Model | FC-RD005 |
| Type | Road Bike Crankset |
| Crank Arm Material | 7050-T7451 Aluminum Alloy |
| Spindle Material | TC4 Titanium Alloy |
| Manufacturing Process | CNC Machining |
| Interface | Easton Direct-Mount Interface |
| Spindle Diameter | 24mm |
| Standard Spindle Length | 127mm |
| Q-Factor | 148mm |
| Chainline | 45mm |
| Crank Arm Lengths | 155 / 160 / 162.5 / 165 / 167.5 / 170 / 172.5 / 175mm |
| Colors | Black / Silver / Purple |
| Bottom Bracket Compatibility | 24mm spindle road BB systems, BSA68 compatible when correctly configured |
| Standard | GB/T 3565.8-2022 |
| Warranty | 1 year, non-human damage |
Compatibility Notes
This crankset is designed for road bike use with an Easton interface.
Compatible setup options include:
- Crankset + Easton direct-mount chainring
- Crankset + Easton spider
- Crankset + Easton-style power meter spider
- Crankset + STONE spider and STONE double chainring setup
For best results, please confirm chainring, spider, bottom bracket, and frame compatibility before installation.
Installation Notes
- Please check the crank interface before installation.
- Use professional tools to install the chainring or spider.
- Recommended lockring torque:
- Chainring/spider lockring: 40–45Nm
- Crank fixing bolt: 45–47Nm
- Use the included titanium anti-seize compound during installation where required.
- The included dedicated spacer is designed for the 24mm spindle setup.
- Removing the dedicated spacer may increase width by approximately 2mm, but this is not recommended unless necessary, as it may affect the chainline.
Package Includes
- Right crank arm
- Left crank arm
- TC4 titanium spindle
- Pedal washers × 2
- Spacer
- Titanium anti-seize compound
