CeramicSpeed OSPW Pulley Wheel System for Shimano Dura-Ace 9250/Ultegra 8150 - Coated Races, Alloy Pulley, Carbon Cage, White Cerakote

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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.