S&S Cycle Flywheel for Evolution - 4-1/4in. Stroke - 8 1/2in. Diameter (Stock) 32-2239Drive 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
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