Rear Shock Absorber - HD 141

Item Summary S36PL type About the Product hlins STX 36 Blackline Rear Shock Set for Harley-Davidson Sportster XL (20042022) Product Overview Upgrade the ride quality and handling of your Harley-Davidson Sportster with the hlins STX 36 Blackline Rear Shock Set, engineered specifically for 20042022 Sportster XL models equipped with 336 mm (13.2-inch) rear shocks. Combining classic styling with advanced suspension technology, the Blackline series delivers improved comfort, enhanced cornering stability, and superior wheel control while maintaining a clean, understated appearance that complements the Sportster's timeless design. Developed using hlins' race-proven suspension expertise, these twin rear shocks feature a 36 mm monotube piston design, precision damping control, and fully rebuildable construction, making them one of the finest suspension upgrades available for Harley-Davidson riders seeking both performance and comfort. Key Features Genuine hlins STX 36 Blackline twin rear shock set Designed specifically for Harley-Davidson Sportster XL models 336 mm (13.2") eye-to-eye length STX monotube damping technology Black anodized body and springs for a discreet factory-inspired appearance Adjustable rebound damping Threaded spring preload adjustment High-pressure nitrogen gas charged Precision CNC-machined aluminum components Fully rebuildable and serviceable Designed for improved comfort and handling Manufactured in Sweden to hlins Racing specifications STX Monotube Technology The STX (Single Tube Technology) damping system utilizes a high-pressure gas-charged monotube design that separates hydraulic oil from nitrogen gas, minimizing cavitation and maintaining consistent damping performance under varying operating temperatures. Compared to conventional twin-shock designs, the STX system offers: More consistent damping characteristics Reduced suspension fade Improved heat dissipation Enhanced wheel control Better traction over uneven road surfaces Increased suspension sensitivity to small bumps The result is a smoother ride without sacrificing chassis stability or rider feedback. Blackline Series Design The hlins Blackline range was developed for riders who prefer understated styling without compromising performance. The durable black finish provides a clean OEM-plus appearance while offering excellent resistance to corrosion and environmental wear. The subtle aesthetic integrates seamlessly with factory or custom Harley-Davidson builds while delivering premium suspension performance hidden beneath the classic styling. Adjustable Rebound Damping Each shock features externally adjustable rebound damping, allowing riders to fine-tune how quickly the suspension extends after compression. Proper rebound adjustment improves: Rear tire contact with the road Corner exit stability Rider confidence High-speed composure Control over uneven pavement Passenger comfort This adjustability enables the suspension to be optimized for solo riding, two-up touring, or varying road conditions. Adjustable Spring Preload Threaded preload adjustment allows accurate setting of rider sag to match rider weight and motorcycle loading. Correct preload setup provides: Improved steering response Better chassis balance Reduced bottoming under heavy loads Increased cornering clearance More consistent suspension performance Enhanced braking stability Proper preload adjustment ensures the suspension operates within its optimal range for maximum performance and comfort. Premium Engineering Every hlins shock absorber is manufactured using precision-machined components and premium materials designed for exceptional durability and long service life. Construction features include: CNC-machined aluminum shock bodies Hard-anodized corrosion-resistant surfaces Precision-ground piston rods Low-friction seal head assemblies High-pressure nitrogen charging Precision shim-stack valving Motorsport-grade hydraulic oil Serviceable internal wear components The fully rebuildable design allows the shocks to be restored to original performance through routine servicing, making them a long-term investment in your motorcycle. Performance Benefits Replacing the factory suspension with the hlins STX 36 Blackline shocks delivers substantial improvements across every aspect of motorcycle dynamics. Improved Ride Comfort Advanced damping technology absorbs road imperfections more effectively, reducing harshness and rider fatigue on long journeys. Enhanced Stability Better control of suspension movement minimizes chassis oscillation during acceleration, braking, and cornering. Increased Rear Tire Grip Improved wheel control allows the rear tire to maintain more consistent contact with the pavement, increasing traction and rider confidence. More Predictable Handling The motorcycle feels more composed through corners and over uneven road surfaces, with smoother weight transfer and improved directional stability. Reduced Suspension Fade The monotube design maintains consistent damping characteristics during prolonged riding where conventional shocks may lose effectiveness due to heat buildup. Technical Specifications Specification Details Manufacturer hlins Racing Product Series STX 36 Blackline 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 Finish Blackline Serviceable Fully Rebuildable Fitment Designed for Harley-Davidson Sportster XL models equipped with 336 mm rear shocks, including: XL883 XL883L SuperLow XL883R XL1200 Custom XL1200 Roadster XL1200 Low XL1200 Nightster XL1200 Forty-Eight XL1200 Iron XL1200 Seventy-Two XR1200 XR1200X Model Years: 20042022 Always verify shock length and model compatibility prior to installation. Installation The hlins STX 36 Blackline shocks are designed as a direct replacement for the original equipment rear shocks and utilize the factory mounting points. Professional installation is recommended to ensure: Proper mounting torque Correct preload adjustment Rider sag optimization Rebound damping setup Maximum suspension performance Following installation, the suspension should be adjusted to suit rider weight and intended riding style. Service and Maintenance Like all premium hlins suspension products, the STX 36 Blackline shocks are fully serviceable. Periodic maintenance restores original damping performance through replacement of hydraulic oil, seals, and internal wear components while allowing inspection and servicing of the valving system. Regular servicing ensures long-term reliability and consistent suspension performance. Why Choose hlins? For nearly five decades, hlins Racing has been a global leader in suspension technology, supplying championship-winning teams across MotoGP, World Superbike, Motocross, Endurance Racing, and numerous international motorsport disciplines. The same engineering principles developed through professional racing are incorporated into every street suspension product, providing riders with exceptional control, comfort, and confidence. For Harley-Davidson Sportster owners seeking a premium suspension upgrade that enhances ride quality without compromising classic styling, the hlins STX 36 Blackline Rear Shock Set delivers outstanding performance, precision engineering, and long-term durability.