STONE Round Narrow-Wide Chainring 40-56T for White Industries R30 M30 Cranks, Road and for Brompton Folding Bike Builds

STONE Round Narrow-Wide Chainring 40-56T for White Industries R30 M30 Cranks, Road and for Brompton Folding Bike Builds

Upgrade your drivetrain with the Stone Round Narrow-Wide Chainring, designed specifically for White Industries R30 and M30 cranksets. Made from high-strength 7075-T651 aerospace-grade aluminum alloy, this chainring offers excellent stiffness, durability, and reliable performance for road, gravel, and 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 R30 / M30 cranksets only

Not Compatible With: Other crank models or for White Industries square taper cranks

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 R30 and M30 cranksets.

It is not compatible with other crank models. It also cannot be installed on for White Industries square taper cranks, because the mounting interface shape is different.

This product 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, as the original for Shimano 12-speed quick link is too narrow.

Tooth Size & Maximum Diameter

Features

• New Stone workshop Narrow-Wide tooth design
• Improved chain retention for better anti-drop performance
• Enhanced self-cleaning ability in muddy or dirty conditions
• Reduced drivetrain noise
• CNC machined for precise fitment and smooth operation

Advantages

1. Premium Material

Made from high-strength 7075-T651 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 performance, and a smooth riding experience.

Available Options

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