S&amp,S Cycle 4-5/8&Prime, Flywheel Assembly 32-2230 Drive side flywheels have special keyed 6deg. larger diameter taper that provides more contact area, increasing strength Standard S&S tapered crank pin and pinion shaft are used for ease of service Kit includes flywheels, crank pin and connecting rods Balanced to stock H-D 80in. pistons at 60%