STONE Oval Direct Mount Chainring for Shimano 12-Speed Cranks – XTR M9100, XT M8100, SLX M7100, MT-900, M9200 & M9220 (30–48T, Boost 148, 52mm Chainline)
The STONE Oval Direct Mount Chainring is engineered for Shimano 12-speed MTB cranksets, including XTR M9100, Deore XT M8100, SLX M7100, MT-900, M9200, and M9220 series cranks.
CNC-machined from high-strength 7075-T651 aerospace-grade aluminum, this oval narrow-wide chainring delivers dependable chain retention, smoother power delivery, and long-lasting durability for demanding trail riding.
With a 3mm offset and 52mm chainline, it is designed specifically for Boost 148 frames.
Specifications
| Item | Details |
|---|---|
| Brand | STONE |
| Material | Aerospace Aluminum 7075-T651 |
| Color Options | Black / Silver anodized |
| Speed Compatibility | 9 / 10 / 11 / 12-speed chains |
| Mount Type | Shimano Direct Mount |
| Shape | Oval |
| Thickness | 7mm |
| Hardness | HB150 |
| Chainline | 52mm |
| Offset | 3mm |
| Frame Compatibility | Boost 148 |
| Crank Compatibility | Shimano M9100 / M8100 / M7100 / MT-900 / M9200 / M9220 |
| Machining Precision | 0.03mm |
| Tooth Options | 30T / 32T / 34T / 36T / 38T / 40T / 42T / 44T / 46T / 48T |
Compatibility
This chainring fits the following Shimano cranksets:
- Shimano XTR M9100 crankset
- Shimano Deore XT M8100 crankset
- Shimano SLX M7100 crankset
- Shimano MT-900 crankset
- Shimano M9200 crankset
- Shimano M9220 crankset
It is suitable for Boost 148 frames with a 52mm chainline.
Note: by default, this chainring does not fit SRAM T-type drivetrains or SRAM AXS Flattop chains.
Important Notice for Shimano 12-Speed Chain Users
If you pair this chainring with a Shimano 12-speed chain, replace the original Shimano 12-speed quick link with another compatible 12-speed quick link, such as:
- KMC
- YBN
- SUMC
- Other compatible 12-speed quick links
The original Shimano 12-speed quick link is too narrow and may not work properly with this chainring.
Size & Weight
| Teeth | Max Diameter | Weight |
|---|---|---|
| 30T | 130mm | 60g |
| 32T | 138mm | 66g |
| 34T | 146mm | 70g |
| 36T | 154mm | 75g |
| 38T | 162mm | 81g |
| 40T | 170mm | 88g |
Weight may vary slightly due to manufacturing tolerances.
Product Features
STONE’s updated narrow-wide tooth design provides stable drivetrain performance in demanding riding conditions:
- Improved anti-chain-drop performance
- Better chain retention on rough terrain
- Enhanced mud and dirt clearance
- Reduced chain noise
- Smooth chain engagement
Package Includes
- 1 × STONE Oval Direct Mount Chainring
