Gemini ÖGLE Carbon Pulley Wheels for Shimano Ultegra Di2 / 105 Di2 12-Speed – Ceramic Bearings

Upgrade your Shimano Ultegra Di2 drivetrain with Gemini ÖGLE carbon pulley wheels. Handcrafted in Barcelona, these lightweight jockey wheels combine forged carbon construction, hybrid ceramic bearings and a distinctive enclosed design.

The 12-tooth upper and 14-tooth lower pulleys fit the original Ultegra Di2 12-speed derailleur cage, allowing you to upgrade without replacing the complete cage. Their larger diameter is designed to reduce chain articulation, while precision bearings with ceramic balls support smooth rotation.

Key features

• Forged carbon construction: carbon fibres moulded continuously around each tooth for a lightweight, rigid structure.

• Hybrid ceramic bearings: ceramic balls designed to minimise rotational friction.

• Fits the original derailleur cage: no aftermarket cage conversion required.

• Enclosed, spokeless design: a clean aerodynamic profile that helps limit debris entering through the pulley body.

• Anodised aluminium covers: complete the bearing assembly.

• Handcrafted in Barcelona: designed and manufactured in-house by Gemini.

Specifications

• Compatibility: Shimano Ultegra Di2 12-speed

• Upper pulley: 12T

• Lower pulley: 14T

• Material: forged carbon with aluminium covers

• Bearings: hybrid ceramic

• Claimed set weight: 22.2 g, including bearings and covers

A distinctive finishing touch for your Ultegra road bike or custom build. Contact Machine for help confirming compatibility.