CeramicSpeed OSPW R9100/R8000 CoatedThis CeramicSpeed OSPW System - Shimano 9100 - Coated features the same construction as the standard model, but it has been developed to take performance optimisation even further and the watt savings start at 2.4 watts. The ceramic bearings in this model have been coated with a special treatment to further reduce friction and increase protection from wear and tear. A thin coating is also applied to the bearing races, to increase corrosion resistance.Shimano Specific Pulley WheelsBecause of the design of the 9100 series derailleurs, the R&D team at CeramicSpeed tested and concluded that the best performing combination of oversized pulleys for the Shimano 9100 series is a 13-tooth upper and 19-tooth lower pulley. The design of this Shimano-specific OSPW System is very strong and stiff to ensure a high durability factor. In-house tests show that the higher the tooth count, the longer pulley wheel lasts.Optimum PerformanceThis revolutionary OSPW System is developed, produced and assembled by hand in Denmark. Designed to be a plug-and-play fit, its the result of an in-depth development process and has been finely tuned to provide optimal performance. Created to answer the need for less friction (as much as 60%), increased speed and a more efficient drivetrain, the OSPW System gives back what other drivetrains take: watts.Features:Material: Cage: Carbon, Polyamide; Bearing: Polyamide, Steel, Ceramic; Castors: AluminiumBearings: Ceramic type 607Pulley Teeth: top 13T, bottom 19TSpeed: 11-SpeedCapacity: 32TSpecifically designed for Shimano Dura-ace 9100/9150Use: Road, Triathlon, RanndoneurWeight: 57gMaintenanceIt’s important that you properly lubricate your bearings in order to ensure optimal performance and maximum longevity. Add oil to the outside of the bearing seal, so that oil can penetrate the bearing. Do this when you lubricate your chain, or if you have washed your bike or have been riding in wet or muddy conditions.Buy CeramicSpeed Components from Chain Reaction Cycles, the Worlds Largest Online Bike Store.