CeramicSpeed Shimano 11-Speed Pulley Wheels (Red) (Alloy) - CSPW10602000
CeramicSpeed Shimano 11-Speed Pulley Wheels (Red) (Alloy) - CSPW10602000, Pulley wheels that reduce friction, last 3-5 time longer than stock high-end pulleys, and reduce overall drag within the drivetrain. Features: Grade 3 Silicon Nitride balls Hand built in Denmark Specs: Fits BrandShimano Drivetrain Speeds11