STONE 121BCD Narrow-Wide Chainring for Campagnolo 4-Arm Cranks – 7075 Aluminum, 44T–60T, 9–12 Speed
Upgrade your 1x drivetrain with the STONE 121BCD narrow-wide chainring, engineered specifically for 1X setups and designed for Campagnolo 121BCD four-arm cranksets, including compatible Super Record Wireless 12-speed cranksets.
Each chainring is precision CNC-machined from 7075-T651 aluminum alloy and finished with a black anodized coating for enhanced corrosion and oxidation resistance. The narrow-wide tooth profile keeps the chain securely engaged, delivering smooth, dependable performance on road, gravel, and time-trial bikes alike.
Important: When installing this chainring on an original Campagnolo 121BCD crankset, 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 reliable chain retention
- Constructed from high-strength 7075-T651 aluminum alloy
- Precision CNC-machined for consistent quality
- 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
| Specification | Detail |
|---|---|
| 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, black anodized |
| Available Sizes | 44T / 46T / 48T / 50T / 52T / 54T / 56T / 58T / 60T |
Chain Compatibility
- 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
| Teeth | Maximum Diameter | Weight | Item No. |
|---|---|---|---|
| 44T | 186 mm | 76.7 g | BCD121-44TY |
| 46T | 194 mm | 79.5 g | BCD121-46TY |
| 48T | 202 mm | 100 g | BCD121-48TY |
| 50T | 210 mm | 113.2 g | BCD121-50TY |
| 52T | 219 mm | 125.3 g | BCD121-52TY |
| 54T | 226 mm | 139 g | BCD121-54TY |
| 56T | 235 mm | 150 g | BCD121-56TY |
| 58T | 242 mm | 148.6 g | BCD121-58TY |
| 60T | 250 mm | 168.2 g | BCD121-60TY |
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.
