CeramicSpeed OSPW Pulley Wheel System for Shimano 9100/8000 Series - Coated Races, 3D Printed Titanium Pulley, Carbon Cage, Ti EA Cage Assembly

Features 13-tooth upper and 19-tooth lower, titanium pulley wheels with Grade 3 Silicon Nitride balls Titanium pulley wheels are 3D-printed and hollow for additional weight savings and durability 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