Your Harley Davidson is unique to you. Replacing your stock suspension with an aftermarket version has been said to be one of the most valuable upgrades you can make to your motorcycle. JRi has taken its many years of racing experience and background to develop a line of suspension components that gives you the optimum ride. JRi wants to ensure that you enjoy the ride, every ride. Performance based settings for improved handling Spring preload easily adjustable with no tools Custom piston designed to hug the road Dyno tested ensuring excellent performance Smooth and controlled ride Rebuildable and serviceable; Note: For riders 260lbs and over use Heavy Duty, for riders 200lbs to 260lbs use Standard Duty, and for riders 140lbs to 200lbs use Light Duty spring rate.