Cer
The CeramicSpeed OSPW Aero ALPHA system for Shimano 9250/8150 derailleurs updates the fastest proven aero derailleur cage to include our patent pending ADR bearing protection and quiet performing ALPHA disc with composite tooth profile pulleys. Furthermore, a speed defying pinstripe graphic has been added for a splash of visual motion. The OSPW Aero ALPHA cages have been updated to accommodate the ADR equipped ALPHA disc pulleys. Not possible to add these pulleys to previous generation OSPW Aero Cage.
FEATURES
Advanced Aerodynamic Design
Reduced aerodynamic drag by up to 60% compared to Shimano’s stock derailleur cage—thanks to a refined cage optimized in wind tunnels (Drag2Zero) to control airflow around the derailleur
Significant Friction Reduction
Delivers a 35–40% reduction in drivetrain friction relative to stock pulley wheels for smoother, more efficient performance
Alpha Disc Pulley Wheels w/ ADR Protection
Features two-part aluminium disc pulleys with composite narrow‑wide tooth profiles—enhancing durability, quiet operation, and chain engagement.
Includes CeramicSpeed’s ADR (Active Debris Remover) system—a patent‑pending debris shield that covers the bearing and dynamically removes dirt
IN THE BOX
Complete OSPW Aero ALPHA for Shimano 9250/8150 system
SPECIFICATIONS
Discipline Road & Tri
Net Weight 111g
Gross Weight 294g
Pulley Material Aluminum
Derailleur Brand Shimano
Compatible Models Dura Ace RD-9250 & Ultegra RD-8150
