STONE Direct Mount Round Chainring 4mm Offset for Easton EC90 / EC90SL CINCH Cranksets – Road, Gravel & Folding Bikes, 9–12 Speed, 38T–58T
Product Description
This STONEDW chainring is a direct-mount round narrow-wide chainring designed for Easton EC90 / EC90SL CINCH cranksets, as well as other cranksets that use the same direct-mount interface.
Suitable for road, gravel, and folding bikes, it delivers reliable chain retention, smooth pedaling, and high drivetrain efficiency.
Key Features
- Direct-mount round chainring
- Designed for Easton EC90 / EC90SL CINCH cranksets and other cranksets using the same EASTON direct-mount interface
- 4.4 mm actual inward offset, nominally listed as 4 mm for simplified model identification
- Available from 38T to 58T
- CNC-machined from 8 mm 7075-T651 aluminum plate
- Anodized surface treatment
- Designed for road, gravel, and folding bike use
- High stiffness, lightweight structure, and long-lasting performance
- Available in Standard and AXS tooth profiles
Custom colors available: Anodized Black, Anodized Silver, Orange Yellow, Red, Apple Green, Purple, Sky Blue, Teal Green, Royal Blue, Rose Pink, and Pink Blue. Please contact us for customization options.
Specifications
| Brand | STONEDW |
|---|---|
| Model | DMCRD-EC-40F-SL2 |
| Material | Imported AL7075-T651 aluminum |
| Hardness | HB150 |
| Thickness | 8 mm |
| Offset | 4.4 mm inward offset |
| Process | CNC machining, anodized finish |
| Teeth Options | 38T / 40T / 42T / 44T / 46T / 48T / 50T / 52T / 54T / 56T / 58T |
| Color | Anodized Black / Anodized Silver |
| Recommended Use | Road bike / Gravel bike / Folding bike |
| Not Recommended For | MTB, due to different chainline requirements |
Crank Compatibility
Please check your crank interface carefully before purchasing.
This chainring is compatible with:
- Easton EC90SL
- Easton EC90
- XXE cranksets with the same interface
- GP3 cranksets with the same interface
- STONEDW FC-RD005 crankset
Note: This chainring is a direct-mount chainring and cannot be installed with a power meter spider.
Chain Compatibility
Please select the correct tooth profile according to your chain type.
Standard Tooth Profile
Compatible with most regular non-Flattop chains:
- 9-speed chains
- 10-speed chains
- 11-speed chains
- 12-speed non-Flattop chains
AXS Tooth Profile
For SRAM original Flattop chains:
- SRAM AXS Flattop chain
- SRAM T-Type Flattop chain
Shimano 12-Speed Chain Notice
If you are using a Shimano 12-speed chain, please replace the original Shimano quick link with a compatible 12-speed quick link from another brand, such as KMC.
Recommended Chainring Size
Road Bike
- Climbing: 38T / 40T
- General riding: 46T / 48T / 50T
- Racing: 52T / 54T
Folding Bike
- Recommended: 50T / 52T / 54T
Gravel Bike
- Recommended: 40T / 42T / 44T
Recommended sizes are for reference only. Please choose according to your actual riding style, cassette range, and terrain.
Size & Weight Reference
| Teeth | Max Outer Diameter | Approx. Weight |
|---|---|---|
| 38T | 162 mm | 95.1 g |
| 40T | 169 mm | 100 g |
| 42T | 178 mm | 106 g |
| 44T | 186 mm | 114.9 g |
| 46T | 194 mm | 125.8 g |
| 48T | 202 mm | 134.5 g |
| 50T | 210 mm | 145.1 g |
| 52T | 219 mm | 148.2 g |
| 54T | 226 mm | 158.1 g |
| 56T | 235 mm | 168.8 g |
| 58T | 242 mm | 174 g |
Weight is for reference only. Product weight may vary due to production updates without prior notice.
Material & Manufacturing
This chainring is made from high-strength 7075-T651 aluminum alloy, providing excellent stiffness, strength, and durability.
The T651 treatment helps reduce internal stress in the aluminum plate, improving machining stability and helping maintain better flatness after CNC processing.
Precision & Quality Control
STONEDW chainrings are manufactured under strict quality control.
- CNC-machined aluminum construction
- Interface parallelism controlled within 0.02 mm
- Fatigue tested under 45° / 1500 N / 50,000 cycles
- Designed to reduce wobble and improve drivetrain stability after installation
Installation Notice
- This chainring can be installed in any direction because it is a round chainring.
- Suitable for road, gravel, and folding bike conversions.
- Not suitable for MTB conversion due to different offset and chainline requirements.
- Please confirm crank interface, chain type, and chainring size before ordering.
Package Includes
- 1 × Chainring
Questions & Answers
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