This chainring is designed for 1x drivetrain setups only. It is not compatible with 2x drivetrains, front derailleurs, or front shifting.
It features STONE’s new narrow-wide tooth profile, which helps improve chain retention, reduce chain drop, improve self-cleaning performance in muddy conditions, and reduce drivetrain noise. Made from high-strength 7075-T651 aluminum alloy from Aleris USA, this chainring offers excellent stiffness, durability, and reliable riding performance.
Specifications
| Item | Specification |
|---|---|
| Brand | STONE |
| Product Type | Round Narrow-Wide Chainring |
| BCD | 120BCD |
| Material | 7075-T651 aluminum alloy from Aleris USA |
| Hardness | 150HB |
| Thickness | 4mm |
| CNC Precision | 0.03mm |
| Color | Black |
| Surface Treatment | Anodized |
| Compatible Crankset | SRAM X9 / XX (Only for 1x setups) |
| Chain Speed | 9 / 10 / 11 / 12-speed (Not for Flattop/ T-type chain） |
| Bolts Included | Yes, 4 aluminum bolts |
Key Features
- Available in round versions
- Designed for 120BCD cranksets
- Compatible with SRAM X9 / XX
- STONE narrow-wide tooth profile for improved chain retention
- Enhanced anti-chain-drop performance
- Better self-cleaning from mud and dirt
- Reduced drivetrain noise
- Made from 7075-T651 aluminum alloy
- CNC-machined with 0.03mm precision
- Black anodized finish
- Includes 4 aluminum bolts
Important Notice for 36T
The 36T chainring comes with washers. When installing the 36T chainring, please use the washers together with the chainring bolts.
Compatibility
Fits compatible:
- For SRAM X9 cranksets
- For SRAM XX cranksets
Please check your crankset BCD and bolt pattern carefully before ordering.
Chain Compatibility
Compatible with:
- MTB chains: 9 / 10 / 11 / 12-speed
- SRAM road chains: 9 / 10 / 11-speed
- Shimano road chains: 9 / 10 / 11 / 12-speed
Not compatible with SRAM AXS 12-speed Flattop chain by default.
If you need a tooth profile for SRAM AXS Flattop chain, please send us a message before ordering. Customization is available with an extra surcharge.
Important Notice for Shimano 12-Speed Road Chain
When using a Shimano 12-speed road chain, you must replace the original Shimano quick link with another compatible 12-speed quick link, such as:
- KMC
- YBN
- SUMC
- Other compatible brands
The original Shimano 12-speed road quick link is too narrow and may cause chain engagement issues.
Available Sizes:
36T / 38T / 40T / 42T / 44T / 46T / 48T / 50T
Round Chainring Size, Diameter and Weight
| Teeth | Max Diameter | Weight |
|---|---|---|
| 36T | 154 mm | 51 g |
| 38T | 162 mm | 61 g |
| 40T | 169 mm | 73 g |
| 42T | 178 mm | 78 g |
| 44T | 186 mm | 87 g |
| 46T | 194 mm | 93 g |
| 48T | 202 mm | 102 g |
Oval Chainring Size, Diameter and Weight
| Teeth | Max Diameter | Weight |
|---|---|---|
| 36T | 158 mm | 48 g |
| 38T | 169 mm | 55 g |
| 40T | 178 mm | 62 g |
| 42T | 186 mm | 70 g |
| 44T | 194 mm | 80 g |
| 46T | 202 mm | 89 g |
| 48T | 210 mm | 90 g |
Package Includes
- 1 × Bike Chainring
- 4 × Aluminum Bolts
Production Time Notice
Most STONE chainrings are made to order.
Please allow 3–5 days preparation time before shipping. Thank you for your understanding.
