-The Conjoined cranks are built using two tapered tubes that are joined together to increase the strength to a whole new level for crank arms. The weight was kept low by developing specifically drawn tubing for the arms and using a unique post welding heat treating method for strength. 19mm 48 spline chromoly spindle. Crankset includes LH/RH drive compatible arms, spindle and hardware only. Bottom bracket sold seperately. Weight: 31ozs..