Stone Round Chainring for Brompton Folding 40–56T, 9 / 10 / 11 / 12-speed, 9-12-Speed, Narrow-Wide, CNC Machined

Stone Round Chainring for Brompton Folding 40–56T, 9 / 10 / 11 / 12-speed, 9-12-Speed, Narrow-Wide, CNC Machined

The Stone Round Narrow-Wide Chainring is designed specifically for White Industries square taper cranksets. Made from high-strength 7075-T651 aerospace-grade aluminum alloy, it offers excellent stiffness, durability, and precise shifting performance for road, gravel, and for Brompton folding bike setups.

Technical Specifications

Product Specifications

Brand: Stone

Material: Aerospace-grade high-stiffness 7075-T651 aluminum alloy

Color Options: Black / Silver

Tooth Profile: Narrow-Wide tooth design

Chainring Type: 1x single chainring only

Speed Compatibility: 9 / 10 / 11 / 12-speed

Crank Compatibility: for White Industries square taper cranksets only

Not Compatible With: for White Industries R30 / M30 cranksets or other crank models

Thickness: 4mm

Hardness: HB150

Processing Precision: 0.03mm

Tooth Options: 40T / 42T / 44T / 46T / 48T / 50T / 52T / 54T / 56T

Application: Road bike / Gravel bike / for Brompton folding bike

Package Includes: 1 x Bike Chainring

Important Compatibility Notes

This chainring is designed only for White Industries square taper cranksets.

It is not compatible with White Industries R30 / M30 cranksets or other crank models, because the mounting interface shape is different.

This chainring is suitable for road bikes and gravel bikes. The chainline is not recommended for MTB use.

Chain Compatibility Notice

This chainring is compatible with standard 9 / 10 / 11 / 12-speed chains.

By default, it does not support for SRAM AXS Flattop 12/13-speed or for SRAM T-Type 12-speed chains.

If you need a customized tooth profile for AXS or T-Type chains, please contact us before placing your order.

If you are using a for Shimano 12-speed chain,

please replace the original quick link with a KMC, YBN, or SUMC 12-speed quick link, because the original for Shimano 12-speed quick link is too narrow.

Tooth Size & Maximum Diameter

The table above helps buyers quickly check frame clearance before purchase, especially for folding bike and gravel bike setups.

Features

• Stone workshop new Narrow-Wide tooth design
• Improved chain retention for better anti-drop performance
• Enhanced self-cleaning ability in muddy or dusty riding conditions
• Reduced drivetrain noise
• High-precision CNC machining for accurate fitment
• Suitable for 1x road, gravel, and folding bike drivetrains

Advantages

1. Premium 7075-T651 Aluminum Alloy

Made from high-strength 7075-T651 aerospace-grade aluminum alloy, this chainring provides excellent stiffness, durability, and long service life.

2. High-Precision CNC Machining

Manufactured with 0.03mm processing accuracy, ensuring reliable fitment, stable chain engagement, and smooth drivetrain performance.

Available Options

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