STONE Direct Mount Chainring for Easton CINCH, Non-AXS 9–12s / for SRAM AXS Flattop 12/13-speed, 4mm Offset

STONE Direct Mount Chainring for Easton CINCH, Non-AXS 9–12s / for SRAM AXS Flattop 12/13-speed, 4mm Offset

Technical Specifications

Compatibility and Selection

Separate tooth-profile options are offered: Non-AXS 9–12-speed and for SRAM AXS Flattop 12/13-speed. These are different selectable options; choose the profile for your chain.

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 for EASTON Direct Mount interface

• 4.4mm actual inward offset, nominally listed as 4mm for simplified model identification.
• Available in 38T to 58T

• CNC-machined from 8mm 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: 8mm

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-AXS Flattop 12/13-speed chains:

• For 9-speed chains
• For 10-speed chains
• For 11-speed chains
• For 12-speed non-AXS Flattop 12/13-speed chains (If you are using a for Shimano 12-speed chain, please replace the original for Shimano quick link with a compatible 12-speed quick link from another brand, such as KMC.)

AXS Tooth Profile

For SRAM original AXS Flattop 12/13-speed chains:

• for SRAM AXS Flattop 12/13-speed chain
• for SRAM T-Type AXS Flattop 12/13-speed chain

for Shimano 12-Speed Chain Notice

If you are using a for Shimano 12-speed chain, please replace the original for 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 162mm, Approx. Weight 95.1g
• 40T: Max Outer Diameter 169mm, Approx. Weight 100g
• 42T: Max Outer Diameter 178mm, Approx. Weight 106g
• 44T: Max Outer Diameter 186mm, Approx. Weight 114.9g
• 46T: Max Outer Diameter 194mm, Approx. Weight 125.8g
• 48T: Max Outer Diameter 202mm, Approx. Weight 134.5g
• 50T: Max Outer Diameter 210mm, Approx. Weight 145.1g
• 52T: Max Outer Diameter 219mm, Approx. Weight 148.2g
• 54T: Max Outer Diameter 226mm, Approx. Weight 158.1g
• 56T: Max Outer Diameter 235mm, Approx. Weight 168.8g
• 58T: Max Outer Diameter 242mm, Approx. Weight 174g

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 0.02mm
• 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

Available Options

Each row below is one available option combination. Choose the complete combination that matches your setup.