STONE 121BCD 1X Single Round Narrow-Wide Chainring for Campagnolo CP Crankset Super Record Wireless 9-12 Speed For Road Bike Gravel Bike TT Bike 44T 54T 56T 58T 60T

Designed For: Campagnolo-specification 121mm BCD asymmetric 4-arm cranksets.

Drivetrain Support: Optimized for 1X setups only. Compatible with standard 9, 10, 11, and 12-speed chains.

Chain Restriction: NOT compatible with SRAM Flattop chains.

Installation Notice: If installing on a factory-original Campagnolo crankset, please reuse your original (OEM) chainring bolts. The included bolts are intended only for specific aftermarket cranks.

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 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.