The rs505 road centre lock front disc hub from shimano is a road disc hub compatible with centre lock rotors these hubs feature improved sealing performance through the use of low friction labyrinth and contact seals and an internal grease sleeve they are designed to be used with either rim brakes or centre lock discs for a secure and hassle free set up the cones of this wheel have gone through a special boron nitride machining process to give super smooth rotations the aluminium hub shel