CeramicSpeed Replacement Parts|Derailleurs & Parts|OSPW Aero Alpha System (Black) (Shimano 9250/8150) (Coated Ceramic Bearings)

CeramicSpeed Oversized Pulley Wheel Aero Alpha System Description:

The CeramicSpeed Oversized Pulley Wheel Aero Alpha System for Shimano Road Dura-Ace R9250 and Ultegra R8150 rear derailleurs represents a leap forward in drivetrain aerodynamics, efficiency, durability, and looks. The updated injection molded polyamide and carbon fiber cage body is designed to reduce significantly reduce aerodynamic drag, and it also is incredibly stiff and has 4 customizable spring tension settings that will allow for very snappy shifts and improved chain retention. The pulleys are a composite construction with a narrow/wide tooth profile that helps with chain retention and helps keep debris from getting stuck in the chain, and each pulley has ADR bearing protection that completely encloses the bearings, helping to keep the bearings clean. These beautiful pulleys roll on hand-built CeramicSpeed coated bearings stuff with Grade 3 Silicon Nitride balls that dramatically reduce the parasitic losses usually found in derailleur pulleys, and these bearings will perform better for far longer than a similar in size steel bearing.

Features:

• Injection molded aerodynamic cage crafted from polyamide and carbon fiber significantly reduces aerodynamic drag, improves stiffness for snappier shifting, and increases the overall strength and durability
• Alpha Disc 13-tooth upper and 19-tooth lower pulley wheels feature a narrow wide tooth profile to improve chain engagement and prevent debris from getting stuck in the chain
• ADR bearing protection completely encloses the bearings to reduce contamination of the bearings
• Hand built CeramicSpeed coated bearings featuring Grade 3 Silicon Nitride balls installed in each pulley for the ultimate reduction of drivetrain drag, long life, and light weight
• Coated bearing races increase bearing service life by increasing hardness of race and reducing corrosion
• 4 customizable spring tension settings to dial in the chain retention and shifting performance of the rear derailleur
• Compatible with Dura Ace 9250 and Ultegra 8150 series (Fits 11-30 and 11-34 Shimano 12spd Cassette options)

Specifications:

• Compatibility: Shimano Dura Ace 9250, Ultegra 8150
• Speeds: 12 Speed
• Max Cog: 34T
• Color: Black