Rear Shock Absorber - HD 144

Item Summary S36PR1C1LB type About the Product hlins STX 36 Twin Rear Shock Set 360 mm for Harley-Davidson Sportster XL (20042022) Product Overview Upgrade your Harley-Davidson Sportster with the legendary performance of the hlins STX 36 Twin Rear Shock Set, specifically engineered for 20042022 Sportster XL models utilizing a 360 mm (14.2-inch) shock length. Designed to significantly improve ride comfort, cornering stability, and chassis control, these premium twin shocks combine classic styling with race-derived suspension technology. Whether your Sportster is a daily rider, weekend canyon cruiser, caf racer, or custom build, the hlins STX 36 delivers a more composed ride by providing superior damping control, improved wheel contact, and increased rider confidence over factory suspension. Every shock is specifically valved and tested for Harley-Davidson applications to provide an ideal balance of comfort and performance. Key Features Genuine hlins STX 36 Twin Rear Shock Set Designed for Harley-Davidson Sportster XL models 360 mm (360.5 mm actual eye-to-eye) length Single-tube high-pressure gas monotube construction 36 mm main piston diameter Adjustable spring preload High-pressure nitrogen charged Precision hydraulic damping system Progressive-rate spring design CNC-machined aluminum construction Fully rebuildable and serviceable Manufactured in Sweden STX 36 Suspension Technology The STX 36 utilizes hlins' proven Single Tube Technology, incorporating a large 36 mm piston operating within a high-pressure gas-charged monotube body. This design separates hydraulic oil from the nitrogen gas chamber, minimizing cavitation and maintaining consistent damping characteristics even during prolonged riding. Compared to conventional OEM shocks, the STX 36 provides: More consistent damping performance Reduced suspension fade Improved heat dissipation Better small-bump compliance Increased rear tire traction Enhanced chassis stability The larger piston area allows for more precise oil flow management, resulting in improved suspension response and greater rider confidence. Progressive Spring Design The supplied progressive-rate springs provide excellent versatility across a broad range of riding conditions. The softer initial rate absorbs small road imperfections for enhanced comfort, while the increasing spring rate offers additional support during aggressive cornering, heavy acceleration, or riding with a passenger and luggage. This progressive characteristic provides a comfortable ride during normal cruising without sacrificing control under demanding conditions. Adjustable Spring Preload Threaded preload adjustment allows riders to properly set suspension sag according to rider weight and intended use. Correct preload adjustment improves: Steering precision Weight distribution Cornering stability Brake performance Ground clearance Passenger comfort Setting rider sag correctly allows the suspension to operate within its optimal travel range, maximizing both comfort and performance. Premium Engineering Every hlins STX 36 shock is manufactured using premium materials and precision machining techniques developed through decades of championship-winning motorsport experience. Construction features include: CNC-machined aluminum shock bodies Hard-anodized corrosion-resistant surfaces Precision-ground piston rods Low-friction sealing system High-pressure nitrogen charging Precision hydraulic valving Motorsport-grade suspension oil Replaceable internal wear components Because the shocks are fully rebuildable, they can be serviced and restored to factory performance rather than replaced, providing exceptional long-term value. Performance Benefits Improved Ride Comfort Advanced hydraulic damping absorbs road imperfections more effectively than stock suspension, reducing harshness and rider fatigue over long distances. Enhanced Chassis Control Better management of suspension movement minimizes chassis pitch and unwanted oscillation during acceleration, braking, and cornering. Increased Rear Wheel Traction Improved damping control helps maintain continuous tire contact with the road surface, enhancing grip and stability. More Predictable Handling The motorcycle responds more consistently during corner entry, mid-corner transitions, and corner exit, providing a more connected and confidence-inspiring ride. Reduced Suspension Fade The gas-charged monotube architecture maintains stable damping characteristics under heavy use and elevated operating temperatures. Technical Specifications Specification Details Manufacturer hlins Racing Product Series STX 36 Twin Shock Type Single Tube High-Pressure Gas Configuration Twin Rear Shock Set Length 360.5 mm Stroke 101 mm Piston Diameter 36 mm Spring Type Progressive Spring Rate 1524 N/mm Progressive Mounted Spring 00480-01 Position Rear Spring Preload Adjustment Yes Serviceable Fully Rebuildable Packaging Pair These shocks utilize an S36E configuration, featuring a 36 mm piston and emulsion-style damping system optimized for road use while maintaining excellent ride quality and reliability. Fitment Designed for numerous Harley-Davidson Sportster XL models (20042022) equipped with 360 mm rear shocks, including: XL883 XL883 Custom XL883 Iron XL1200 Custom XL1200 Forty-Eight XL1200 Forty-Eight Special XL1200 Iron XL1200 Nightster XL1200 Low XL50 50th Anniversary Additional Sportster variants utilizing 360 mm OEM shock length Always verify your motorcycle's original shock length before ordering, as different Sportster models were equipped with multiple rear suspension heights from the factory. Installation The hlins STX 36 Twin Rear Shock Set installs directly using the factory mounting points with no permanent modifications required. For optimum performance, professional installation and suspension setup are recommended to ensure: Proper rider sag Correct preload adjustment Balanced chassis geometry Maximum ride comfort Optimal handling characteristics Proper suspension setup can significantly improve the overall riding experience and maximize the performance potential of the motorcycle. Service and Maintenance Like all premium hlins suspension products, the STX 36 Twin shocks are fully rebuildable. Periodic servicing replaces hydraulic oil, seals, and internal wear components, restoring original damping performance and extending service life. Routine maintenance ensures consistent suspension performance and protects your investment for many years of riding. Why Choose hlins? For nearly 50 years, hlins Racing has been recognized as one of the world's leading suspension manufacturers, with technology proven in MotoGP, World Superbike, Endurance Racing, and numerous other professional motorsport disciplines. Every street suspension product benefits from this racing heritage, delivering exceptional control, comfort, and reliability for riders who demand the highest level of performance. For Harley-Davidson Sportster owners looking to elevate their motorcycle's handling, ride quality, and overall confidence without sacrificing classic styling, the hlins STX 36 Twin Rear Shock Set 360 mm represents one of the most significant suspension upgrades available.