STONE FC-RD003 Road 3-Bolt Crankset | CNC Aluminum Racing Crank Arms | 7075 / 7050 Alloy | 155–175mm
Upgrade your road bike with the STONE FC-RD003 3-Bolt Road Crankset, engineered for riders who demand a perfect balance of lightweight performance, strength, stiffness, and long-term reliability. Designed with a clean modern appearance and precision CNC machining, this crankset is suitable for road bikes, gravel setups, and custom drivetrain builds using SRAM-style 3-bolt direct mount interfaces.
Made from high-strength 7050-T7451 aluminum crank arms and a 7075-T651 aluminum spindle, the FC-RD003 delivers excellent durability while keeping weight low. Each crankset is produced through in-house CNC machining and tested to meet GB/T 3565.8-2022 racing-level standards, making it a reliable choice for training, racing, and performance road cycling.
Key Features
High-Strength Full Aluminum Construction
The crank arms are made from 7050-T7451 aluminum alloy, selected for its excellent resistance to corrosion, cracking, and long-term fatigue. The spindle uses 7075-T651 aluminum alloy, offering high strength and hardness for stable power transfer.
Precision CNC Machined
Manufactured with in-house CNC processing for consistent quality, accurate dimensions, and a refined finish. The product is designed for riders who care about both performance and detail.
SRAM-Style 3-Bolt Direct Mount Interface
Compatible with 3-bolt direct mount chainrings, 3-bolt spiders, and selected 3-bolt power meter spiders. This gives riders more flexibility when building different drivetrain setups.
Standard & WIDE Spindle Options
Available in both standard and WIDE versions:
- Standard spindle: 120mm spindle length, Q-factor 146mm
- WIDE spindle: 125mm spindle length, Q-factor 151mm
The WIDE version is ideal for gravel bikes or frames requiring wider chainline clearance.
default order we send 120mm spindle version.
Multiple Crank Arm Lengths
Available in a wide range of crank lengths to suit different riding styles, bike fits, and rider preferences:
155 / 160 / 162.5 / 165 / 167.5 / 170 / 172.5 / 175mm
Short crank options are especially suitable for riders seeking improved cadence, better bike fit, or more pedal clearance.
Lightweight Performance
Approximate standard spindle weight:
- 155mm: 506.7g
- 160mm: 514.7g
- 162.5mm: 515.7g
- 165mm: 526.9g
- 167.5mm: 529.3g
- 170mm: 533.3g
- 172.5mm: 538.6g
- 175mm: 545.1g
WIDE version adds approximately 3–5g.
Racing-Level Fatigue Tested
The crankset has passed racing-level fatigue testing according to GB/T 3565.8-2022, including:
- 45° / 1800N / 70,000 cycles
- 30° / 1800N / 100,000 cycles
Built for demanding riding conditions and long-term confidence.
Anodized Surface Treatment
The surface is anodized to improve corrosion resistance and reduce oxidation, helping the crankset maintain its premium appearance over time.
Specifications
| Item | Specification |
|---|---|
| Brand | STONE |
| Model | FC-RD003 |
| Type | Road Crankset |
| Crank Arm Material | 7050-T7451 Aluminum Alloy |
| Spindle Material | 7075-T651 Aluminum Alloy |
| Spindle Diameter | 28.99mm |
| Mounting Interface | SRAM-style 3-Bolt Direct Mount |
| Q-Factor | 146mm / 151mm WIDE |
| Spindle Length | 120mm Standard / 125mm WIDE |
| Crank Length Options | 155 / 160 / 162.5 / 165 / 167.5 / 170 / 172.5 / 175mm |
| Chainline | Approx. 46mm with inner-offset 4.2mm road direct mount chainring |
| Finish | Anodized |
| Standard | GB/T 3565.8-2022 |
| Warranty | 1 year, non-human damage |
Compatibility
The FC-RD003 crankset is designed for road bike crank applications and uses a 28.99mm spindle. It is compatible with SRAM-style 3-bolt direct mount chainrings, spiders, and selected power meter spiders.
Recommended Setup
Standard Version
- Spindle length: 120mm
- Q-factor: 146mm
- Suitable for standard road bike frames
- Compatible with BSA68 bottom bracket setups using appropriate spacers
- Similar fitting dimensions to SRAM Force D1 road cranksets
WIDE Version
- Spindle length: 125mm
- Q-factor: 151mm
- Spindle is 5mm longer than the standard version
- Usually requires 2.5mm spacers on both sides
- Ideal for gravel bikes or frames requiring wider chainline clearance
- Chainline increases by approximately 2.5mm
Why Choose STONE FC-RD003?
- Full aluminum CNC crankset for road and gravel use
- Lightweight without sacrificing strength
- 7050-T7451 crank arms for improved durability
- 7075-T651 spindle with high strength and hardness
- SRAM-style 3-bolt direct mount compatibility
- Standard and WIDE spindle options available
- Multiple crank arm lengths from 155mm to 175mm
- Racing-level fatigue tested
- Clean appearance with anodized surface protection
