STONE SRAM 8-Bolt Direct Mount Hollow Round Narrow-Wide Chainring – 4mm Offset, AXS (FlatTop) & Non-AXS, 38T–58T for SRAM Rival, Force, Red & STONE FC-RD004
Upgrade your drivetrain with the STONE SRAM 8-Bolt Direct Mount Round Chainring, engineered specifically for SRAM road 8-bolt cranksets. Machined from premium 7075-T651 aluminum, it pairs a 4mm inward offset with a narrow-wide tooth design and a lightweight hollow round profile for dependable chain retention and smooth, efficient power transfer.
Two tooth profiles are available: choose the AXS profile for SRAM FlatTop chains, or the Non-AXS profile for standard 9/10/11/12-speed non-FlatTop chains.
Key Features
- Compatible with SRAM road 8-bolt direct mount cranksets
- Available in AXS and Non-AXS tooth profiles
- 4mm inward offset design
- Round narrow-wide single chainring with hollow construction
- CNC machined from 7075-T651 aluminum
- 8mm thick aluminum plate construction
- Anodized finish for corrosion and wear resistance
- Tooth sizes from 38T to 58T
- Suitable for road, folding bike, and gravel setups
- Multiple color options available
- T20 installation, recommended torque: 4 Nm
Full Product Description
The STONE SRAM 8-Bolt Direct Mount Round Chainring is built for riders who want a clean, efficient, lightweight single-chainring setup on SRAM road 8-bolt cranksets.
Each chainring is CNC machined from high-strength 7075-T651 aluminum for excellent stiffness, durability, and precise fitment. The narrow-wide tooth design improves chain retention, making it well suited to road, gravel, and folding bike applications.
This chainring uses a 4mm inward offset design. The actual inward offset measures approximately 4.4mm, and the model is simplified as 4OF. This offset moves the chainline closer to the frame, improving drivetrain efficiency with larger cassette sprockets and reducing the chance of chain drop while backpedaling.
Tooth Profile Options
AXS Tooth Profile
Choose the AXS tooth profile if you are using:
- SRAM AXS 12-speed FlatTop chain
- SRAM T-Type chain
- SRAM original FlatTop chain
The AXS tooth profile is designed around SRAM’s flat-top chain structure and provides proper engagement with SRAM AXS 12-speed road drivetrains.
Non-AXS Tooth Profile
Choose the Non-AXS tooth profile if you are using:
- Standard 9-speed chains
- Standard 10-speed chains
- Standard 11-speed chains
- Standard 12-speed non-FlatTop chains
- Shimano 9/10/11/12-speed chains
- SRAM 9/10/11/12-speed non-FlatTop chains
- Most conventional chains
For Shimano 12-speed chains, we recommend replacing the original quick link with a KMC 12-speed quick link for better compatibility.
Compatibility
Crank Compatibility
Compatible with:
- SRAM road 8-bolt direct mount cranksets
- SRAM Rival 8-bolt cranksets
- SRAM Force 8-bolt cranksets
- SRAM Red 8-bolt cranksets
- STONE FC-RD004 cranksets
This chainring fits both standard spindle and WIDE spindle SRAM road cranksets.
Bike Compatibility
Suitable for:
- Road bikes
- Folding bikes
- Gravel bikes
Not recommended for mountain bike crankset conversions due to different offset and chainline requirements.
Specifications
| Item | Specification |
|---|---|
| Brand | STONE |
| Model | DMCRD-SR8-4OF-SL2 |
| Type | Round narrow-wide single chainring |
| Mount | SRAM 8-bolt direct mount |
| Material | 7075-T651 aluminum |
| Thickness | 8mm |
| Process | CNC machined |
| Finish | Anodized |
| Offset | 4mm inward offset |
| Actual Offset | Approx. 4.4mm |
| Chainring Sizes | 38T, 40T, 42T, 44T, 46T, 48T, 50T, 52T, 54T, 56T, 58T |
| Tooth Profile Options | AXS / Non-AXS |
| Installation Tool | T20 Torx wrench |
| Recommended Torque | 4 Nm |
Size and Weight Chart
| Teeth | Max Outer Diameter | Weight | SKU |
|---|---|---|---|
| 38T | 162 mm | 91.6 g | DMCRD-SR8-4OF-SL2-38TY |
| 40T | 169 mm | 100 g | DMCRD-SR8-4OF-SL2-40TY |
| 42T | 178 mm | 110.7 g | DMCRD-SR8-4OF-SL2-42TY |
| 44T | 186 mm | 119.5 g | DMCRD-SR8-4OF-SL2-44TY |
| 46T | 194 mm | 128 g | DMCRD-SR8-4OF-SL2-46TY |
| 48T | 202 mm | 136.4 g | DMCRD-SR8-4OF-SL2-48TY |
| 50T | 210 mm | 145 g | DMCRD-SR8-4OF-SL2-50TY |
| 52T | 219 mm | 150 g | DMCRD-SR8-4OF-SL2-52TY |
| 54T | 226 mm | 158.8 g | DMCRD-SR8-4OF-SL2-54TY |
| 56T | 235 mm | 172.6 g | DMCRD-SR8-4OF-SL2-56TY |
| 58T | 242 mm | 177.8 g | DMCRD-SR8-4OF-SL2-58TY |
Weights are for reference only. Product weight may vary slightly due to production updates or finishing differences.
Color Options
Available colors:
- Anodized Black
- Anodized Silver
- Orange
- Red
- Grass Green
- Purple
- Sky Blue
- Teal Green
- Royal Blue
- Rose Pink
- Pink Blue Gradient
Actual product color may vary slightly from photos due to lighting and screen settings.
Recommended Tooth Sizes
Road Bike
- Climbing: 38T / 40T
- Daily riding: 46T / 48T / 50T
- Racing: 52T / 54T
Folding Bike
- Recommended: 50T / 52T / 54T
Gravel Bike
- Recommended: 40T / 42T / 44T
Recommended sizes are for reference only. Please choose based on your drivetrain setup, cassette range, terrain, and riding style.
Installation Notes
- Confirm your crankset is SRAM road 8-bolt direct mount before purchase.
- Install using a T20 Torx wrench.
- Recommended installation torque: 4 Nm.
- The chainring can be installed in any direction due to the round design.
- This product is designed for road, folding bike, and gravel use.
- Not recommended for MTB crankset conversion.
- Choose the correct tooth profile according to your chain type:
- AXS for SRAM FlatTop / AXS / T-Type chains
- Non-AXS for standard non-FlatTop chains
Quality and Design
Every STONE chainring is made from premium 7075-T651 aluminum, a material known for its high strength, hardness, and excellent fatigue resistance. The CNC-machined structure improves accuracy and stiffness, while the anodized surface treatment helps resist corrosion and wear.
The reinforced tooth edge and multi-spoke round structure are designed to reduce deformation under load and deliver stable power transfer during hard efforts.
