Rear Shock Absorber - HD 219

Item Summary S36PR1C1LB type About the Product hlins STX 36 Twin Shock Absorber HD 219 305 mm Black for Harley-Davidson Dyna FXD Series (19912017) Product Overview The hlins HD 219 STX 36 Twin Shock Absorber Set is a premium suspension system engineered specifically for Harley-Davidson Dyna FXD models utilizing a 305 mm (12-inch) rear shock length. Featuring an advanced S36PR1C1L configuration with an external piggyback reservoir, adjustable rebound damping, adjustable compression damping, and adjustable ride height, the HD 219 delivers exceptional suspension performance for riders demanding the highest levels of comfort, control, and chassis precision. Designed with race-proven hlins technology, these shocks significantly improve rear wheel traction, ride quality, and handling while maintaining the classic twin-shock appearance of the Harley-Davidson Dyna platform. Whether cruising highways, carving mountain roads, or building a high-performance custom motorcycle, the HD 219 offers a dramatic improvement over factory suspension. Key Features Genuine hlins STX 36 Twin Rear Shock Set hlins Part Number: HD 219 Type Code: S36PR1C1L Designed for Harley-Davidson Dyna FXD models 305 mm (+10/-0 mm) adjustable length External piggyback reservoir 36 mm piston diameter High-pressure nitrogen gas monotube construction Adjustable rebound damping Adjustable compression damping Adjustable ride height Adjustable spring preload with included billet preload tool Multiple spring rate options available Hard-anodized CNC-machined aluminum components Low-friction shaft and seal head design Fully rebuildable and serviceable Made in Sweden Advanced STX 36 Monotube Technology The HD 219 utilizes hlins' Single Tube Technology (STX) featuring a 36 mm piston operating within a high-pressure gas-charged monotube body. Unlike conventional emulsion shocks, the external piggyback reservoir increases oil capacity and improves thermal stability, allowing the suspension to maintain consistent damping characteristics during extended aggressive riding. Key advantages include: Reduced cavitation Improved heat dissipation Consistent damping performance Enhanced suspension sensitivity Better rear tire contact Increased chassis stability Improved rider feedback The result is a motorcycle that feels more planted, predictable, and confidence inspiring in every riding environment. External Piggyback Reservoir The integrated piggyback reservoir increases hydraulic oil volume and provides improved temperature control during sustained operation. Benefits include: Reduced damping fade Improved oil cooling Greater consistency during long rides Enhanced suspension control under heavy loads Superior performance during aggressive cornering This design is ideal for riders seeking premium suspension performance on touring, performance, or custom Dyna builds. Adjustable Rebound Damping External rebound adjustment allows the rider to precisely control suspension extension speed following compression. Proper rebound tuning provides: Improved rear wheel traction Greater stability during acceleration Enhanced corner exit performance Reduced chassis oscillation Increased rider confidence Better compliance over uneven pavement The easily accessible adjuster allows quick tuning changes to suit rider preference and road conditions. Adjustable Compression Damping The external compression adjuster located on the piggyback reservoir allows independent tuning of suspension compression characteristics. Compression adjustment helps optimize: Impact absorption Brake dive control Cornering stability Passenger comfort High-speed bump compliance Chassis balance Independent rebound and compression tuning provide a wide adjustment range for riders seeking a personalized suspension setup. Adjustable Ride Height The HD 219 features adjustable overall length, allowing ride height changes of 305 mm +10/-0 mm without compromising suspension travel. Ride height adjustment enables: Quicker steering response Increased cornering clearance Customized chassis geometry Improved rider ergonomics Optimized handling characteristics This feature makes the HD 219 particularly attractive for custom builds and performance-oriented riders. Adjustable Spring Preload Mechanical spring preload adjustment allows proper rider sag setup based on rider weight, passenger load, or luggage. Correct preload adjustment contributes to: Balanced chassis geometry Improved steering precision Better braking stability Increased cornering confidence Enhanced suspension performance Maximum tire contact A billet preload adjustment tool is included for convenient setup. Premium Engineering Every hlins STX 36 shock is manufactured using premium materials and precision machining processes developed through decades of championship-winning motorsport competition. Construction highlights include: CNC-machined aluminum bodies Hard-anodized corrosion-resistant finish Precision-ground piston rods Low-friction seal head assemblies High-pressure nitrogen charging Precision shim-stack valving Premium hlins suspension oil Replaceable internal wear components Because the shocks are fully rebuildable, they can be serviced and restored to original factory performance, providing exceptional long-term value. Technical Specifications Specification Details Manufacturer hlins Racing Part Number HD 219 Type Code S36PR1C1L Shock Type Monotube with Piggyback Reservoir Piston Diameter 36 mm Length 305 mm (+10/-0 mm adjustable) Stroke 64 mm Spring Rate 33 N/mm Mounted Spring 66419-032 Position Rear Rebound Adjustment Yes Compression Adjustment Yes Ride Height Adjustment Yes Spring Preload Adjustment Yes Serviceable Fully Rebuildable Packaging Pair Fitment Designed for Harley-Davidson Dyna FXD models (19912017) equipped with 305 mm rear shocks, including: Dyna Super Glide (FXD) Dyna Super Glide Custom (FXDC) Dyna Low Rider (FXDL) Dyna Low Rider S (FXDLS) Dyna Street Bob (FXDB) Dyna Fat Bob (FXDF) Dyna Wide Glide (FXDWG) Dyna Switchback (FLD) Additional Dyna models utilizing the 305 mm shock length Always verify OEM shock length and application before ordering. Installation The HD 219 is designed as a direct replacement for the factory rear suspension using OEM mounting points. For optimum performance, professional installation and suspension setup are recommended to ensure: Proper rider sag Correct preload adjustment Optimized rebound and compression settings Balanced chassis geometry Maximum suspension performance Fine-tuning these adjustments allows the suspension to be tailored for solo riding, two-up touring, or aggressive performance use. Service and Maintenance Like all premium hlins suspension products, the HD 219 is fully rebuildable and designed for long service life. Routine servicing includes replacement of hydraulic oil, seals, and internal wear components, restoring factory damping performance and ensuring years of reliable operation. Why Choose hlins? For nearly five decades, hlins Racing has been a global leader in suspension technology, supplying championship-winning teams in MotoGP, World Superbike, Motocross, and endurance racing. That same engineering expertise is built into every street suspension product, providing riders with exceptional control, comfort, and confidence. For Harley-Davidson Dyna owners seeking a fully adjustable, race-inspired suspension system with premium construction and outstanding road performance, the hlins HD 219 STX 36 Twin Shock Set represents one of the finest suspension upgrades available.