The STONE 120BCD Oval Chainring is designed for compatible SRAM X9 and SRAM XX cranksets and is intended for 1x drivetrain setups only. This chainring is not compatible with 2x drivetrains, front derailleurs, or front shifting systems.
Featuring STONE’s updated narrow-wide tooth profile, it helps improve chain retention, reduce chain drop, enhance self-cleaning performance in muddy conditions, and reduce drivetrain noise. Made from high-strength 7075-T651 aluminum alloy from Aleris USA, this chainring provides excellent stiffness, durability, and reliable riding performance.
Specifications
| Item | Specification |
|---|---|
| Brand | STONE |
| Product Type | Oval 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, 1x setups only |
| Chain Speed | 9 / 10 / 11 / 12-speed, not for Flattop / T-Type chain |
| Bolts Included | Yes, 4 aluminum bolts |
Key Features
- Oval chainring design for smoother power delivery
- Designed for 120BCD cranksets
- Compatible with SRAM X9 / XX
- For 1x drivetrain setups only
- 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 oval 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.
This chainring is designed for 1x drivetrain setups only and is not compatible with front derailleurs or front shifting.
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 contact us 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 Oval Sizes
- 36T
- 38T
- 40T
- 42T
- 44T
- 46T
- 48T
- 50T
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.
