Designed and developed entirely by CeramicSpeed, the Oversized Pulley Wheel System for Shimano RX800/805 provides the ultimate optimization of your bicycle's drivetrain.The 13-tooth upper and 19-tooth lower aluminium pulley wheels come fitted with either standard or coated CeramicSpeed Bearings.This OSPW X System has a custom molded carbon fiber cage for lightweight and durability. The 4 tension spring settings allow for optimal drivetrain setup based on riding conditions.OSPW X is specifically designed for both road, gravel and cross riding and is platform proven at races like Paris Roubaix, Strada Bianche and CX World Cups.In The BoxA complete 13/19-tooth OSPW SystemCeramicSpeed Bearing Oil in 15ml dropper bottleTech DataOSPW X for Shimano RX800/805 fits cassettes up to 36-tooth (11-36 range).This OSPW system reduces friction 35-40% over stock pulley configuration. The oversized pulley wheels have 3-5 longer lifetime than the commonly used standard pulleys on the market. This product