STONE 88BCD Round Narrow-Wide Chainring 30-48T for Shimano M985 Cranksets, 9-12-Speed, Includes Four Bolts

STONE 88BCD Round Narrow-Wide Chainring 30-48T for Shimano M985 Cranksets, 9-12-Speed, Includes Four Bolts

Upgrade your MTB drivetrain with the STONE 88BCD Narrow-Wide chainring, designed for Shimano M985 cranks. Built for maximum stability and long-lasting performance, this chainring helps reduce chain drop risk on rough terrain—so every ride stays smooth and powerful.

Technical Specifications

Key Features

• Fitment: compatible with Shimano M985 crank
• Chainline Compatibility: Supports for Shimano and for SRAM 12-speed chains
• Speeds: Works with 9/10/11/12-speed drivetrains
• Bolt Package: Includes 1 × chainring + 4-bolt
• BCD: 88BCD
• Thickness: 4mm
• Color: Black
• Surface Treatment: Anodized finish + high-speed CNC machining

Material & Strength

Made from High-strength Aluminum 7075-T651, supplied by a USA company (Aleris)—a supplier to major aircraft manufacturers including Airbus, Boeing, and Bombardier.

• Material Hardness: HB150
• Purpose: Best stiffness and endurance for aggressive MTB riding

Precision CNC Machining

This chainring is produced with high-precision CNC equipment from Taiwan and Germany.

• Machining accuracy: 0.03mm
• Result: tighter tolerances and more consistent drivetrain performance

Hollow vs. Non-Hollow Design

To balance stiffness and weight across sizes:

• 30T–34T: Non-hollow style
• 36T–48T: Hollow style

Why Choose It

• Narrow-Wide Teeth Design: Improves chain retention for safer shifting
• Strong 7075-T651 Aluminum: Built to handle tough trails
• Clean CNC + Anodized Finish: Durable surface and great look

Package Includes

• 1 × STONE 88BCD Chainring
• 4 × bolts

Material from USA company Aleris, it supply aluminum to aircraft make Airbus, Boeing and Bombardier as well.

Available Options

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