Shock Springs - 13-Series - Black - 75-155 lb/inCaracteristicas: 13 Series O R shocks contain Freon cells for fade free performance Same features as the standard 1200 Series, but set up for the special demands of dual sport and off road riding 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