ProX Big End Pin (20x46.00mm) KX60/65 85-23 + RM65 03-05 Our chromed crank pins are specially designed for the application. Every ProX crank pin is machined precisely and treated to get the best hardness and properties to stand the extreme conditions where it is used for. Our 4 stroke crank pins have precision located oil canals to maximise oiling under extreme conditions.