CeramicSpeed OSPW Aero Alpha for Shimano 9250/8250

CeramicSpeed OSPW Aero Alpha for Shimano 9250/8150 The CeramicSpeed OSPW Aero ALPHA system for Shimano 9250/8150 derailleurs updates the fastest proven aerodynamic derailleur cage to include their patent-pending ADR bearing protection and quietly performing ALPHA disc with composite tooth profile pulleys. The OSPW Aero ALPHA cages have been updated to accommodate the ADR-equipped ALPHA disc pulleys.