Rear Lowering Kit: Engineered to lower the rear of your motorcycle 1-3/4" lower than stock. Lowers the center of gravity, easing handling effort and improving control. Gives the bike a tough, custom stance. High quality steel construction and precision m Save money by buying this lowering kit and spring combo. The kit includes a Heavy Duty Shock Spring and a Lowering Kit. Raider Heavy Duty Shock Spring: Designed to work with stock shock. Allows for the smoothest possible ride on lowered bikes or two-up riding by alleviating bottoming, sagging and diving. The 993-pound heavy duty design gives you the comfort and control you need for a plush ride always.