The rotor bbright bb4624 bottom bracket press fit 24mm the bbright pressfit bottom bracket which is especially dedicated to cerveacutelo frames or frames compatible with bbright standard for cranks with 24mm axle diameter rotor bbright bb4624 bottom bracket press fit 24mm features adaptor cups and bearings for the installation of 24mm cranks in bb30 pf frames steel black 137g anodized and lasered aluminium cups lathe amp cnc produced anodized al cups with t6