Ohlins STX Performance Rear Shocks For Harley Sportster Ohlins is one of the best known names in motorcycle suspension for good reason, they make shocks that perform. If you are looking for a responsive shock capable of returning consistent performance mile after mile, the STX Performance Shocks might be just the ticket. The STX Performance rear shocks are a step up from the entry level STX Classic emulsion shocks. The main difference between the two is the addition of a divided piston within the damping circuit. This piston keeps the nitrogen charge separate from the damping oil for more reliable performance under heavy use. The only adjustment available to the rider is preload, compression and rebound damping rates are set at the factory. Like all Ohlins shocks, the STX Performance utilize precision machining on all componentry, allowing for a low friction, high performance design. The wide range of preload adjustments allows you to soften or stiffen the ride, and can also accommodate many riders varying in weight. Features: STX Monotube high pressure gas shock absorber with internal reservoir in the main body Adjustable preload Multiple spring rates available to accommodate a wide range of riders Hard anodized Nitrogen charged Precision CNC-machined components Low-friction piston rod Low-friction eyelets Serviceable and repairable 36mm piston diameter Includes preload adjuster tool Sold as a pair Spring Weights: Light Duty recommended for individual rider weighing under 180lbs Standard recommended for individual rider weighing 180lbs - 225lbs Heavy Duty recommended for individual rider weighing over 250lbs