A well-proven monotube design, the Öhlins STX 46 shock absorber sets the standard for performance, quality, and durability for your 18+ Softails. It is a major suspension upgrade from stock suspension. It features a large 46mm main piston, an internal gas reservoir within the main body of the shock, length adjustability, and a hydraulic preload adjuster. With adjustable damping, you can change the behavior of the shock to suit your taste. This shock features a length adjuster that allows for a ride height change without compromising suspension travel. The hydraulic preload is the highlighted feature of this shock – allowing you to make preload changes without a tool to accommodate weight variations. Do not hesitate to contact us if you have ANY questions. Features Shock length : 320.5mm / 12.61” Adjustable Rebound Damping Hose Mounted Hydraulic Preload Adjustment Monotube Shock with internal Reservoir High Pressure Nitrogen Gas Charged STX Single Tube design 46mm Piston Diameter Adjustable Preload w/ Billet tool Multiple Spring Rates available to accommodate a wide range of riders Top Level Comfort, Rideability, and Performance Hard Anodized - Precision CNC-Machined Components Low-friction Shaft / Seal Head design Fully Serviceable and Repairable Fitment 2018-2023 Harley-Davidson Softail FLSB & FXFB Fit 2018-2024 Softail models like FXST, FXLRS, FXLRST, FXLR & FXBB using our OG Preload Adjuster Mount