STONE 121BCD 1X Round Narrow-Wide Chainring for Campagnolo Super Record Wireless Crankset 9–12-Speed Road / Gravel / TT Bike

Upgrade your 1x drivetrain with the STONE 121BCD narrow-wide chainring, designed for 1X setups and compatible with Campagnolo 121BCD four-arm cranksets, including compatible Super Record Wireless 12-speed cranksets.

Made from premium 7075-T651 aluminum alloy, the chainring is precision CNC-machined and finished with black anodizing for improved corrosion and oxidation resistance. Its narrow-wide tooth profile provides reliable chain retention and smooth drivetrain performance.

Important: When installing the chainring on an original Campagnolo 121BCD crankset, please use the original Campagnolo chainring bolts. The four included bolts are suitable only for compatible aftermarket cranksets.

Key Features

• 121BCD round chainring for compatible Campagnolo four-arm cranksets
• Designed exclusively for 1X drivetrains

• Narrow-wide tooth profile for improved chain retention
• Made from high-strength 7075-T651 aluminum alloy

• Precision CNC-machined
• Black anodized finish for enhanced corrosion resistance

• Compatible with most 9 / 10 / 11 / 12-speed regular chains
• Available in sizes from 44T to 60T

• Suitable for road, gravel, and TT bikes

Specifications

• Brand: STONE
• BCD: 121 mm

• Shape: Round
• Crank Interface: Campagnolo four-arm

• Drivetrain: 1X / single-chainring setup
• Material: Imported AL7075-T651 aluminum alloy

• Hardness: 150 HB
• Thickness: 4 mm

• Finish: CNC-machined and black anodized
• Available Sizes: 44T / 46T / 48T / 50T / 52T / 54T / 56T / 58T / 60T

Chain Compatibility

• Compatible with CP R12 chain
• Compatible with 9–12-speed Shimano chains (When using an original Shimano 12-speed chain, replace the original Shimano Quick-Link with a compatible third-party 12-speed link, such as a KMC MissingLink)
• Compatible with 9–12-speed SRAM non-Flattop chains
• Not compatible with standard SRAM Flattop chains unless a custom tooth profile is specified

Installation Instructions

For aluminum bolts

• Use a T30 Torx wrench
• Installation Torque 11–12 Nm

Installation notice: Original Campagnolo 121BCD cranksets require the original Campagnolo chainring bolts. The included bolts are intended only for compatible aftermarket cranksets.

Size & Weight

Package Includes

• 1 × STONE 121BCD narrow-wide chainring
• 4 × complimentary chainring bolts

Bolt compatibility: The complimentary bolts are suitable only for compatible aftermarket cranksets. If you have an original Campagnolo 121BCD crankset, you must reuse the original Campagnolo bolts.

Notes

• Compatible only with applicable Campagnolo 121BCD four-arm cranksets. Please check your crankset’s BCD and mounting interface before ordering.
• Tooth profile and chainring appearance may vary slightly depending on the selected tooth count.
• Dimensions and weights are measured manually; slight variations may occur.
• Product specifications and weight may change due to ongoing product updates.