The 100mm fat bike stainless bottom bracket from hope is a specially designed bottom bracket to accommodate the fat bike frames just like the standard hope bottom brackets these bottom brackets are machined aluminium cnc cups with replaceable full stainless steel bearings that are swiss made and double sealed to ensure a much greater life span the bearings are made by ina and have been designed to run directly on the crankset axle without the use of spacers or shims which also helps ensure l