Ceramicspeed derailleur pulley OSPW RS Alpha for Shimano 9250 / 8150 silver 113609

CeramicSpeed OSPW RS ALPHA – Shimano 9250/8150

The CeramicSpeed OSPW RS ALPHA Shimano 9250/8150 Silver is an oversized pulley wheel (OSPW) system designed for Shimano Dura-Ace RD-9250 and Ultegra RD-8150 rear derailleurs. It is engineered to reduce drivetrain friction, improve efficiency, and enhance durability while featuring a modern, angular design.

Key Features

• Compatible with Shimano Dura-Ace RD-9250 / Ultegra RD-8150
• Updated RS ALPHA reinforced cage design
• Reduced chain friction for improved drivetrain efficiency
• Patented ADR (Anti Debris Resistance) technology
• Enhanced protection against dirt and contamination
• Customizable design (logos and pulley options)

Technology

ADR Technology (patented)

• Advanced dust cover system fully encloses the bearing
• Prevents debris ingress into pulley bearings
• Bladed groove structure actively removes dirt during rotation
• Developed through lab testing and professional racing feedback

ALPHA Disc pulley wheels

• Two-piece construction
• Composite narrow-wide tooth profile for durability and noise reduction
• Solid aluminum disc prevents debris from entering the pulley structure
• Increased stiffness and strength

Technical Specifications

In the box

• Complete OSPW RS ALPHA system for Shimano 9250/8150

In practice

This system is a performance upgrade for Shimano road drivetrains, designed to reduce friction in the rear derailleur system and improve pedaling efficiency. It is especially suited for high-performance road racing and triathlon use.