STONE FC-RD003 Road Crankset: CNC 7050 Alloy Arms, 29mm DUB Spindle, 155–175mm Options for Road and Gravel
The STONE FC-RD003 3-bolt road crankset is built for riders who want a balance of light weight, strength, stiffness, and long-term reliability. With a clean modern look and precision CNC machining, it suits road bikes, gravel setups, and custom drivetrain builds using SRAM-style 3-bolt direct mount interfaces.
The crank arms are made from high-strength 7050-T7451 aluminum and the spindle from 7075-T651 aluminum, delivering excellent durability at a low weight. Every crankset is produced through in-house CNC machining and tested to meet GB/T 3565.8-2022 racing-level standards, making it a dependable 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, chosen for its excellent resistance to corrosion, cracking, and long-term fatigue. The spindle uses 7075-T651 aluminum alloy, providing high strength and hardness for stable power transfer.
Precision CNC Machined
In-house CNC processing ensures consistent quality, accurate dimensions, and a refined finish—ideal 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, giving you flexibility across different drivetrain setups.
Standard and WIDE Spindle Options
- 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. By default, we ship the 120mm standard spindle version.
Multiple Crank Arm Lengths
Available in a wide range of 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 weights with the standard spindle:
- 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
The 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 anodized surface improves corrosion resistance and reduces 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
