Stone Oval Direct Mount Chainring for Easton EC90 SL CINCH Cranksets (3.5mm Offset, 40T–54T)
The Stone Oval Direct Mount Chainring is engineered specifically for cranksets using the Easton EC90 SL CINCH system interface. Built for gravel and road riding, it delivers precise chain engagement, reliable chain retention, and smooth, consistent drivetrain performance.
Machined from high-strength 7075-T651 aluminum, it pairs a lightweight construction with excellent stiffness and long-term durability. The narrow-wide tooth profile helps prevent chain drop and improves mud and dirt clearance in varied conditions.
Two tooth profiles are available:
- Version 1 — compatible with 9–12 speed standard chains
- Version 2 — compatible with AXS Flattop / T-Type chains
Both versions are offered. Please confirm and select the correct option when ordering.
Specifications
| Item | Details |
|---|---|
| Brand | Stone |
| Material | High-strength aluminum 7075-T651 |
| Color | Black, anodized |
| Speed Compatibility | 9 / 10 / 11 / 12-speed chains |
| Crank Interface | Easton EC90 SL CINCH system interface |
| Recommended Use | Gravel / Road bike |
| Not Recommended For | MTB |
| Thickness | 8mm |
| Hardness | HB150 |
| Chainline | 46mm |
| Offset | 3.5mm inner offset |
| CNC Precision | 0.03mm |
| Tooth Profile | Narrow-wide |
Compatibility
This chainring is designed to fit:
- Easton EC90 SL CINCH cranksets
- Cranks with the same interface as Easton EC90 SL
- Spiders with the same interface
- Power meters with the same interface
Important: If your crank, spider, or power meter uses the same CINCH interface as the Easton EC90 SL, this chainring will fit.
Chain Compatibility Notes
Please review the following notes carefully before ordering:
Shimano 12-Speed Road Chain
If you use a Shimano 12-speed road chain, replace the original Shimano quick link with a compatible alternative, such as KMC or YBN.
The original Shimano 12-speed quick link is too narrow and may not work properly with this chainring.
SRAM AXS Flattop Chain
The default tooth option does not support SRAM AXS Flattop chains.
If you use a SRAM AXS Flattop chain, select the AXS tooth option when placing your order.
Important Notice
This chainring is recommended for:
- Gravel bikes
- Road bikes
- CX / cyclocross-style riding
It is not recommended for MTB use, because MTB drivetrains usually require a different chainline.
Please confirm your crank interface, chain type, and chainline before purchase.
Package Includes
- 1 × Stone bike chainring
