Product Description
This STONEDW chainring is a direct-mount round narrow-wide chainring designed for Easton EC90 / EC90SL CINCH cranksets, as well as compatible cranksets with the same interface.
It is suitable for road bikes, gravel bikes, and folding bikes, offering reliable chain retention, smooth pedaling performance, 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 in 38T to 58T
- CNC-machined from 8 mm 7075-T651 aluminum plate
- Surface treated with anodizing
- Designed for road, gravel, and folding bike use
- High stiffness, lightweight structure, and durable performance
- Available in Standard tooth profile and AXS tooth profile
- 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: 4.4mm 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:
- For Easton EC90SL
- For Easton EC90
- For XXE cranksets with the same interface
- For GP3 cranksets with the same interface
- For 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:
- For 9-speed chains
- For 10-speed chains
- For 11-speed chains
- For 12-speed non-Flattop chains（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.）
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
- 38T: Max Outer Diameter 162 mm, Approx. Weight 95.1 g
- 40T: Max Outer Diameter 169 mm, Approx. Weight 100 g
- 42T: Max Outer Diameter 178 mm, Approx. Weight 106 g
- 44T: Max Outer Diameter 186 mm, Approx. Weight 114.9 g
- 46T: Max Outer Diameter 194 mm, Approx. Weight 125.8 g
- 48T: Max Outer Diameter 202 mm, Approx. Weight 134.5 g
- 50T: Max Outer Diameter 210 mm, Approx. Weight 145.1 g
- 52T: Max Outer Diameter 219 mm, Approx. Weight 148.2 g
- 54T: Max Outer Diameter 226 mm, Approx. Weight 158.1 g
- 56T: Max Outer Diameter 235 mm, Approx. Weight 168.8 g
- 58T: Max Outer Diameter 242 mm, Approx. Weight 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 with 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
