STONE Road Bike Crankset Easton Interface 7050 Aluminum CNC Crank Arms with TC4 Titanium Spindle FC-RD005 155mm to 175mm RD-005

The STONE FC-RD005 is a high-performance road bike crankset designed with an Easton direct-mount interface, precision 7050T7451 aluminum CNC-machined crank arms, and a lightweight TC4 titanium spindle. Developed with reference to Shimano road crank geometry, it offers a road-standard 148mm Q-factor, 45mm chainline, and multiple crank arm lengths from 155mm to 175mm.

Available in black, silver, and purple, the FC-RD005 is built for riders who demand strength, precision, compatibility, and clean aesthetics.

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 provides flexible drivetrain configuration options for road cycling use.

2. 7050T7451 Aluminum CNC-Machined Crank Arms

The crank arms are made from 7050T7451 aluminum alloy, known for its high strength, excellent stiffness, and durability.

Each crank arm is manufactured through precision CNC machining, ensuring:

• Accurate dimensions
• Consistent finish
• Reliable structural performance
• Clean and minimal appearance

3. TC4 Titanium Alloy Spindle

The FC-RD005 is equipped with a TC4 titanium alloy spindle, offering a balance of 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 designed to resist impact, deformation, and fatigue under long-term high-intensity use.

4. Road Standard Geometry

The FC-RD005 is designed with road bike fitment in mind 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

Suitable for standard road bike bottom bracket setups such as BSA68, when used with compatible 24mm bottom brackets.

5. Multiple Crank Arm Lengths

Available in 8 crank arm lengths to suit different riders and bike fit requirements:

Weight may vary slightly due to manufacturing tolerance.

6. Three Color Options

Available colors:

• Black
• Silver
• Purple

The anodized finish provides a premium appearance and helps improve surface durability.

7. Fatigue Tested Structure

The crankset structure has been optimized through fatigue strength testing.

Test information shown by manufacturer:

• Passed GB/T 3565.8 competition-level test
• 45° / 1800N / 70,000 cycles
• 30° / 1800N / 100,000 cycles

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

Compatibility Notes

This crankset is designed for road bike use with an Easton interface.

Compatible setup options include:

1. Crankset + Easton direct-mount chainring
2. Crankset + Easton spider
3. Crankset + Easton-style power meter spider
4. 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 it is not recommended unless necessary, as it may affect the chainline.

Package Includes

The package includes:

1. Right crank arm
2. Left crank arm
3. TC4 titanium spindle
4. Pedal washers × 2
5. Spacer
6. Titanium anti-seize compound