This 4-1/2" stroke 8-1/2" diameter flywheel assembly replaces the original flywheels in S&S® 93" P93, P93H, SH93, and SH93H engines with alternator/generator or alternator style crankcases for custom bikes with 1970-'99 style chassis and drive train. Flywheels are CNC machined from heat-treated, closed die, steel forgings, and are stronger than cast iron or late style steel flywheels. Dynamically balanced and fully assembled with premium quaility S&S® mainshafts and heavy duty 7.440" connecting rods.