Rear Shock Absorber - HD 143

Item Summary S36PR1C1LB type About the Product hlins STX 36 Twin Rear Shock Set for Harley-Davidson Sportster XL (336 mm) Product Overview Transform the handling, comfort, and overall ride quality of your Harley-Davidson Sportster with the hlins STX 36 Twin Rear Shock Set, engineered specifically for Sportster models utilizing 336 mm (13.2-inch) rear shocks. Combining classic twin-shock styling with modern suspension technology, the STX 36 provides exceptional wheel control, improved traction, and superior rider comfort without compromising the iconic appearance of the Sportster platform. Designed and manufactured in Sweden, the STX 36 series incorporates hlins' race-derived hydraulic damping technology to deliver consistent suspension performance across a wide range of riding conditions. Whether cruising city streets, carving canyon roads, or touring long distances, these shocks provide a noticeable improvement in chassis stability and rider confidence over the factory suspension. Key Features Genuine hlins STX 36 twin rear shock absorber set Designed for Harley-Davidson Sportster XL models with 336 mm eye-to-eye length Single Tube (STX) high-pressure gas monotube technology 36 mm main piston for precise damping control Adjustable rebound damping Threaded spring preload adjustment High-pressure nitrogen gas charged Precision CNC-machined aluminum bodies Hard anodized components for maximum corrosion resistance Low-friction piston rod and sealing system Fully rebuildable and serviceable Manufactured in Sweden STX 36 Single Tube Technology The STX 36 utilizes a single-tube hydraulic damping system that separates hydraulic oil from the nitrogen gas chamber using an internal floating piston. This design minimizes cavitation and aeration of the suspension oil, maintaining consistent damping characteristics even during extended or aggressive riding. Compared to conventional OEM twin shocks, the STX system provides: More precise damping control Improved heat dissipation Reduced damping fade Better wheel movement over uneven pavement Increased rear tire traction Enhanced chassis stability The 36 mm piston allows greater hydraulic control and more accurate valving, enabling the suspension to respond quickly to changing road conditions while maintaining excellent rider comfort. Rebound Damping Adjustment External rebound adjustment allows riders to fine-tune suspension extension speed after compression. Proper rebound setup improves: Rear wheel traction Stability during corner exit Chassis control under acceleration Rider confidence Suspension recovery over successive bumps Overall handling precision The adjustability allows the suspension to be tailored to rider preference, motorcycle loading, and road conditions. Spring Preload Adjustment Threaded spring preload adjustment enables proper suspension sag settings for riders of different weights and riding styles. Correct preload adjustment contributes to: Improved steering geometry Balanced chassis attitude Increased cornering stability Better braking performance Reduced bottoming Enhanced passenger comfort Optimizing preload ensures the shock operates within its designed working range for maximum performance. Premium Construction Every hlins STX 36 shock is manufactured using high-quality materials and precision engineering processes developed through decades of international motorsport competition. Construction highlights include: CNC-machined aluminum shock bodies Hard-anodized protective finish Precision-ground chrome piston rods Low-friction seal head assemblies High-pressure nitrogen charging Precision shim-stack valving Premium hydraulic oil Replaceable internal wear components The fully serviceable design allows complete rebuilding and re-valving, ensuring years of reliable performance and long-term value. Performance Benefits Improved Ride Comfort The advanced damping system absorbs road imperfections more effectively than the factory suspension, reducing harsh impacts and rider fatigue on long rides. Enhanced Cornering Stability Improved damping control minimizes unwanted chassis movement, resulting in more predictable handling and greater confidence through corners. Superior Traction By maintaining more consistent tire contact with the road surface, the STX 36 enhances grip during acceleration, braking, and cornering. Reduced Suspension Fade The monotube gas-charged design maintains consistent damping performance under heavy use and elevated operating temperatures. Increased Rider Feedback Improved suspension sensitivity allows the rider to better feel available traction and road conditions, contributing to a more connected riding experience. Technical Specifications Specification Details Manufacturer hlins Racing Product Series STX 36 Configuration Twin Rear Shock Set Shock Type Monotube Hydraulic Length 336 mm (13.2") Piston Diameter 36 mm Gas Charging High-pressure Nitrogen Rebound Adjustment Yes Spring Preload Adjustment Yes Construction CNC-machined Aluminum Serviceable Fully Rebuildable Fitment Designed for Harley-Davidson Sportster XL models utilizing 336 mm rear shocks, including numerous variants produced between 2004 and 2022, such as: XL883 XL883L SuperLow XL883R XL1200 Custom XL1200 Low XL1200 Roadster XL1200 Nightster XL1200 Forty-Eight XL1200 Iron XL1200 Seventy-Two XR1200 XR1200X Always verify your motorcycle's OEM shock length and fitment before ordering, as certain Sportster models were offered with different ride heights. Installation The hlins STX 36 rear shocks are designed as direct bolt-on replacements utilizing the original mounting points. Professional installation is recommended to ensure: Correct mounting torque Proper suspension sag adjustment Optimized preload settings Rebound damping calibration Maximum suspension performance After installation, rider sag should be adjusted according to rider weight and intended riding conditions for optimal chassis balance. Service and Maintenance Like all premium hlins suspension products, the STX 36 is fully rebuildable and designed for long service life. Periodic maintenance includes replacement of hydraulic oil, seals, bushings, and wear components, restoring the shocks to original factory performance. Regular servicing ensures: Consistent damping characteristics Extended component life Maximum riding comfort Reliable long-term performance Why Choose hlins? Since 1976, hlins Racing has been recognized as one of the world's leading manufacturers of high-performance suspension systems, supplying championship-winning teams in MotoGP, World Superbike, endurance racing, motocross, and numerous other motorsport disciplines. The same engineering philosophy applied in professional competition is incorporated into every street suspension product, delivering exceptional control, precision, and durability for riders worldwide. For Harley-Davidson Sportster owners seeking a premium suspension upgrade that significantly enhances ride quality, stability, and handling while preserving the motorcycle's classic twin-shock appearance, the hlins STX 36 Twin Rear Shock Set (336 mm) represents one of the finest performance investments available.