CeramicSpeed Oversized Pulley Wheel System (Black/Red) (Shimano 9100/8000) (Coated Ceramic Bearings)

CeramicSpeed Oversized Pulley Wheel System Description: The CeramicSpeed Oversized Pulley Wheel System provides optimization and increased efficiency of the rear derailleur through its extremely low-friction bearings and unique overall design. Features: Features 13-tooth upper and 19-tooth lower, aluminum pulley wheels with Grade 3 Silicon Nitride balls Robust cage crafted from polyamide and carbon fiber for durability and light weight Coated bearing races increase bearing service life by increasing hardness of race and reducing corrosion Only compatible with Dura Ace 9100/9150 and Ultegra 8000-SS/8050-SS Not compatible with Ultegra 8000-GS or 8050-GS (medium cage) nor with the clutch equipped Ultegra RD RX800/RX805 CeramicSpeed products with coated bearings include a lifetime warranty Specifications: Compatibility: Ultegra R8000-SS , Ultegra R8050-SS/GS , Dura-Ace R9100 , Dura-Ace R9150 Speeds: 11 Speed Max Cog: 32T Color: Black/Red