PROGRESSIVE SUSPENSION Shock Springs - 12-Series - Chrome - 120-170 lb/in 03-1365C

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 riders over 200 lb., passenger usage over 50% of the time and/or add-on accessories of considerable weight., These springs must be ordered when ordering 12-series shocks. However, they can be used as replacements for the 412-series shocks