The Oversized Pulley Cage (OSPW) Carbon Ceramic Derailleur is specifically designed for Shimano Ultegra RD-8150 and Dura-Ace RD-9250 12-speed derailleurs. Developed by our engineering team to deliver a superior riding experience, it optimizes drivetrain efficiency, installs easily, and adds a custom touch of color to your bicycle. Hand-assembled with the highest quality materials, it combines an ultralight construction with extreme durability, ensuring more precise shifts and top-level performance for both professional cyclists and enthusiasts.

Features and Innovations:

Premium Materials: Made with top-tier materials to guarantee maximum longevity without maintenance needs: custom cage structure in ultralight and durable 3K carbon fiber, 7075 aluminum pulleys, and full-ceramic dry bearings.
Pulley Configuration: The system includes two oversized 7075 aluminum pulleys, with 14 teeth (upper) and 17 teeth (lower) respectively.

Installation and Maintenance:

Cassette: It is recommended to use a cassette with a maximum of 34 teeth to ensure optimal adjustments and shifts.
Chain: To ensure maximum performance, a new chain must be used at the time of installation, adding 2-4 extra links compared to the previous configuration.
Longevity and Lubrication: The design features full-ceramic bearings protected by dedicated aluminum covers, designed to maximize lifespan and minimize concerns related to technical interventions. The system operates completely dry: no grease or lubricants are required.
Cleaning: Thanks to the all-ceramic composition, the bearings are completely immune to oxidation. In case of debris buildup between the covers and bearings during use, a simple wash with water or degreaser is sufficient.
Important Warning: As these are bearings designed to work dry, NEVER apply any type of lubricant.

Technical Specifications:
Compatibility: Shimano Ultegra RD-8150 and Dura-Ace RD-9250 12-speed.
Pulley Configuration: 14 teeth and 17 teeth.
Cage Material: 3K carbon fiber, lightweight and durable.
Pulley Material: 7075 Aluminum.
Bearing Type: Full-ceramic dry bearings.
Weight: 73 g.