STONE 104BCD Oval Narrow Wide Chainring for Shimano & SRAM 1x Drivetrains, 34–50T, 9–12 Speed
This precision oval narrow wide chainring is built for 1x drivetrains and fits a wide range of Shimano and SRAM cranksets with a 104BCD bolt pattern.
- Compatible with Shimano M430, M590, M610, M615, M670, M675, M770, M780, M785, M970, M980, M820
- Available sizes: 34T / 36T / 38T / 40T / 42T / 44T / 46T / 48T / 50T
Product Description
This Stone oval narrow wide chainring is designed for 1x drivetrain systems, delivering reliable chain retention, smooth pedaling, and long-lasting durability. Machined from high-strength 7075-T651 aluminum alloy, it makes a dependable upgrade for MTB, gravel, and compatible road bike setups.
The oval shape helps improve pedaling efficiency by reducing the dead spot in each pedal stroke, making climbing and acceleration feel smoother and more efficient.
Specifications
| Brand | Stone |
|---|---|
| Material | High-strength aluminum 7075-T651 |
| Hardness | HB150 |
| BCD | 104BCD |
| Thickness | 4 mm |
| Surface treatment | Anodized finish |
| Color | Black |
| Manufacturing process | High-speed CNC machining |
| CNC precision | 0.03 mm |
| Chainring type | Oval narrow wide chainring |
| Drivetrain compatibility | 1x only |
Compatible Cranksets
Shimano
M430 / M590 / M610 / M615 / M670 / M675 / M770 / M780 / M785 / M970 / M980 / M820, as well as other compatible 104BCD cranksets.
SRAM
Compatible with most SRAM 104BCD cranksets, including the X0 / X5 / X7 / X9 / XF series.
Chain Compatibility
MTB Chains
Compatible with 9 / 10 / 11 / 12-speed MTB chains.
SRAM Road Chains
Compatible with 9 / 10 / 11-speed SRAM road chains.
Shimano Road Chains
Compatible with 9 / 10 / 11 / 12-speed Shimano road chains.
Important Note
This chainring is not compatible with SRAM AXS 12-speed Flattop chains. If you need a tooth profile compatible with SRAM AXS Flattop chains, please contact us for customization—extra customization fees may apply.
Shimano 12-Speed Road Chain Notice
When using a Shimano 12-speed road bike chain, replace the original Shimano quick link with another brand’s 12-speed quick link, such as KMC, YBN, SUMC, or other compatible brands. The original Shimano 12-speed road quick link is too narrow and may not fit properly.
Size, Diameter & Weight
| Size | Max Diameter | Weight (approx.) |
|---|---|---|
| 34T | 154 mm | 50 g |
| 36T | 162 mm | 62 g |
| 38T | 170 mm | 69 g |
| 40T | 178 mm | 72 g |
| 42T | 186 mm | 78 g |
| 44T | 194 mm | 86 g |
| 46T | 202 mm | 98 g |
| 48T | 210 mm | 109 g |
| 50T | 218 mm | 118 g |
Package Includes
- 1 x Chainring
- 4 x Chainring bolts
Features
High-Strength 7075-T651 Aluminum
Made from premium 7075-T651 aluminum alloy, offering excellent stiffness, strength, and long-lasting durability.
Precision CNC Machining
Manufactured with high-precision CNC technology, with machining accuracy up to 0.03 mm for reliable performance and accurate fitment.
Narrow Wide Tooth Design
The narrow wide tooth profile improves chain retention and helps prevent chain drops during riding.
Oval Chainring Design
The oval shape helps optimize power transfer, improve pedaling efficiency, and reduce pedaling dead spots.
Lightweight and Durable
A great balance of low weight, strength, and performance for MTB, gravel, and compatible road bike use.
Important Notes
- This chainring is designed for 1x drivetrain systems only.
- It cannot be used for 2x or 3x drivetrains.
- It does not support front derailleur shifting.
- Please make sure your crankset is 104BCD before purchasing.
