STONE 135BCD Narrow-Wide Chainring for Campagnolo 1x Cranks, 42–60T in CNC 7075 Aluminum
The STONE 135BCD narrow-wide chainring is designed for riders who want a strong, precise, and dependable single-chainring setup. Each ring is machined from high-strength 7075-T651 aluminum alloy, CNC-cut to exacting tolerances, and anodized for greater durability and corrosion resistance.
The chainring is built for 1x drivetrains only and is available in a wide range of tooth sizes from 42T up to 60T, so you can match your gearing to road or MTB riding.
Product Specifications
| Item | Specification |
|---|---|
| Product Name | STONE 135BCD Narrow Wide Chainring |
| BCD | 135BCD |
| Chainring Type | Round |
| Tooth Profile | Narrow Wide |
| Material | 7075-T651 High-Strength Aluminum Alloy |
| Material Hardness | HB150 |
| Thickness | 4 mm |
| CNC Precision | 0.03 mm |
| Surface Treatment | Anodized, High-Speed CNC Machined |
| Color Options | Black, Silver |
| Drivetrain Type | 1x Only |
| Teeth Options | 42T / 44T / 46T / 48T / 50T / 52T / 54T / 56T / 58T / 60T |
Compatibility
This chainring is designed for 1x drivetrain systems only. It is not compatible with 2x drivetrains and does not support front shifting.
Chain Compatibility
| Chain Type | Compatibility |
|---|---|
| MTB 8 / 9 / 10 / 11 / 12-speed chains | Compatible |
| Road 8 / 9 / 10 / 11-speed chains | Compatible |
| Shimano 12-speed road chains | Compatible with quick link replacement |
| SRAM AXS 12-speed Flattop chains | Not compatible |
Shimano 12-Speed Chain Notice
If you use a Shimano 12-speed road chain, the original Shimano 12-speed quick link may be too narrow. For better compatibility, replace the original Shimano quick link with another compatible 12-speed quick link, such as:
- KMC
- YBN
- SUMC
- Other compatible 12-speed quick links
SRAM AXS Flattop Chain Notice
The standard version of this chainring does not support SRAM AXS 12-speed Flattop chains. If you need a tooth profile compatible with SRAM AXS Flattop chains, please contact us before ordering. Customization is available with an extra surcharge.
Size, Diameter & Weight
| Teeth | Max Diameter | Hollow Version Weight | Aero Version Weight |
|---|---|---|---|
| 42T | 186 mm | 57.7 g | — |
| 44T | 186 mm | 68.8 g | — |
| 46T | 193 mm | 64.4 g | 83.7 g |
| 48T | 201 mm | 76.7 g | 106.8 g |
| 50T | 209 mm | 80.3 g | 115.1 g |
| 52T | 218 mm | 87 g | 125.8 g |
| 54T | 226 mm | 98.2 g | 137.9 g |
| 56T | 242 mm | 104.7 g | 150.1 g |
| 58T | 242 mm | 109.2 g | 163.8 g |
| 60T | 250 mm | 125.7 g | 186.4 g |
Weight may vary slightly due to production tolerance.
Package Includes
- 1 × Chainring
- 5 × Chainring Bolts
Material & Manufacturing Advantages
Premium 7075-T651 Aluminum Alloy
This chainring is made from high-strength 7075-T651 aluminum alloy, offering excellent stiffness, strength, and durability. The aluminum is supplied by Aleris, a well-known USA aluminum supplier that also serves aerospace manufacturers such as Airbus.
High-Precision CNC Machining
Each chainring is produced with high-speed CNC machining and a processing accuracy of 0.03 mm. This ensures:
- Accurate tooth profile
- Smooth chain engagement
- Stable riding performance
- Reliable power transfer
Narrow-Wide Tooth Design
The narrow-wide tooth profile helps improve chain retention on 1x drivetrains and reduces the chance of chain drop during riding.
