Hope mtb ceramic bottom bracketall common systems are covered with this upgrade unit making it ideal for shimano race face and others the machined aluminium cups hold either full stainless steel cartridge bearings or ceramic bearings in stainless races these custom swiss made bearings are double sealed fully serviceable and removable which give much greater life span than stock units the bearings are made as all hope bearings are by ina and have been designed to run directly on the cr