Shock Springs - 12-Series - Chrome - 70-120 lb/inCaracteristicas: 12 series shocks are gas charged for superior, fade free damping and consistent operation Six stage, automatic damping designed with a special anti topping function Double wall shock body construction for piston protection and long life Standard spring is recommended for bike as sold new, excluding any accessories, rider weight under 200 lb. and passenger use limited to under 50% of the time. Heavy duty spring is recommended for