Bottom bracket adapter, valid to install 24mm diameter cranks on any PF30 / BB30 bottom bracket (68mm wide and 30mm internal diameter box). It reduces the internal diameter of the bearing from 30 to 24mm and increases the width of the bottom bracket up to 89mm. to be able to install cranks with 24mm thick axle (Shimano HollowTechII and FSA MegaExo).
