OSPW Aero ALPHA for Shimano 9250/8150

The OSPW Aero ALPHA is designed for the athlete who leaves nothing to chance. Developed in collaboration with aerodynamics expert Simon Smart (Drag2Zero), this system features a fully enclosed carbon fiber cage that significantly reduces wind resistance compared to standard "open" cages. It integrates the ALPHA Disc Pulley Wheel, which uses a solid aluminum disc to eliminate turbulence caused by spinning spokes and prevents debris from entering the drivetrain. With the addition of ADR (Active Debris Remover) technology and handbuilt coated ceramic bearings, this is the most aerodynamically efficient and durable pulley system CeramicSpeed has ever produced. It is the definitive choice for time trialists, triathletes, and road racers looking to maximize every single watt.

Key Features

• Aerodynamic Shielding: The injection-molded carbon-reinforced cage is shaped to "hide" the lower pulley from the wind, tested to be the fastest derailleur cage in the world.

   

• ALPHA Disc Technology: Features a solid disc design that eliminates spoke turbulence and provides immense lateral stiffness for the snappiest shifts possible.

   

• Active Debris Remover (ADR): A patent-pending technical feature that uses a unique dust cover and bladed groove to dynamically extract grit and water while the pulley rotates.

   

• Coated Ceramic Bearings: Standard with "Coated" races that are 75% harder than hardened steel, offering the lowest possible friction and a lifetime warranty.

• Pinstripe Visual Design: Features a unique "speed pinstripe" graphic on the aero shroud, signaling its high-velocity performance.

   

Specifications

• Compatibility: Shimano Dura-Ace RD-9250 and Ultegra RD-8150 (12-speed Di2)

   

• Pulley Setup: 13-tooth upper and 19-tooth lower ALPHA Disc pulleys

   

• Bearing Type: Coated Ceramic (Standard for the Aero ALPHA line)

• Cage Material: Carbon fiber reinforced PA (Polyamide)

   

• Max Cassette Size: 34T (Fits 11-30 and 11-34 Shimano 12-speed cassettes)

   

Typical Components Included

• Complete OSPW Aero ALPHA System

• CeramicSpeed Pulley Oil (15ml)

• B-Gap adjustment tool

• Installation instructions and sticker sheet