Keep your bearings in optimum condition with the park tool hhp 3 home mechanic bearing cup press designed to install all sizes of head cups from 1 to 1 12 it will also install one piece bottom bracket cups lm features park tool hhp 3 home mechanic bearing cup press designed to install all sizes of head cups from 1 to 1 12 and one piece bottom bracket cups will also press bb30 and bb90 system cups thread is 58 16mm in diameter will press the bmx bottom brackets