The STONE BCD120P Round Narrow Wide Chainring is designed for compatible domestic PR5 / PR6 cranksets. Made from premium 7075-T651 aluminum, it features a durable CNC-machined structure, anodized surface treatment, and a narrow-wide tooth profile for stable chain retention and efficient power transfer.

Available in 38T to 54T, this chainring is suitable for road riding, commuting, DIY upgrades, gravel, and mixed-terrain use.

Key Features

• BCD120P chainring for PR5 / PR6 compatible cranksets
• Round narrow-wide tooth design
• CNC machined from 7075-T651 aluminum
• 4mm thickness for lightweight performance
• Anodized finish for corrosion and wear resistance
• Compatible with 9/10/11/12-speed Shimano chains
• Compatible with 9/10/11/12-speed SRAM non-FlatTop chains
• AXS / FlatTop tooth profile available by customization
• Available from 38T to 54T
• Black anodized finish
• Designed for road, commuting, DIY builds, and gravel riding

Tooth Profile Compatibility

Default Tooth Profile: Non-AXS 9-12s chain

• For Shimano 12-speed chains, we recommend replacing the original quick link with a KMC 12-speed quick link for improved compatibility.

Compatibility

Crank Compatibility

This chainring is designed for:

• PR5 cranksets
• PR6 cranksets
• Compatible domestic cranksets using the BCD120P standard

Please confirm your crankset interface and bolt pattern before purchase.

Riding Applications

Suitable for:

• Road cycling
• Commuting
• DIY bike upgrades
• Gravel riding
• Mixed-terrain riding
• Fitness riding

Specifications

Size and Weight Chart

Weights are for reference only. Product weight may vary slightly due to production updates or structural changes.

Design Details

The STONE BCD120P chainring features a carefully optimized narrow-wide tooth structure for reliable chain engagement.

Tooth Design Advantages

• Narrow-wide tooth profile helps improve chain retention
• Mud clearance grooves help reduce mud buildup
• Rounded entry surfaces guide the chain smoothly onto the teeth
• Reinforced tooth back improves support and stability
• CNC-machined tooth shape improves fit and drivetrain smoothness
• Round chainring design provides consistent pedaling feel

Material and Finish

Each chainring is made from premium 7075-T651 aluminum plate, selected for its strength, hardness, and machining stability.

The T651 material condition includes heat treatment and pre-stretching, helping reduce internal stress and improve dimensional stability after CNC machining. This helps minimize deformation and improves chainring flatness after installation.

The anodized surface treatment helps prevent long-term oxidation and improves wear resistance.

Important Notes

• Default tooth profile is Non-AXS.
• For SRAM FlatTop / AXS / T-Type chains, please choose or request the custom AXS tooth profile.
• For Shimano 12-speed chains, replacing the original quick link with a KMC 12-speed quick link is recommended.
• Different tooth counts may have slightly different appearance and cutout design.
• Please confirm crankset compatibility before purchase.
• Product color and finish may vary slightly due to lighting, screen display, and production batch differences.