Progressive Suspension 444-4067C 444 Series FST Rear Shocks for Harley-Davidson

The Progressive Suspension 444 Series shocks bring a new level of ride intelligence to your Harley-Davidson with the introduction of Frequency Sensing Technology (FST). Building on the legendary success of the 440 Series shocks with IAS, the 444 Series represents a major leap forward in rear suspension performance.

Frequency Sensing Technology (FST) works by detecting the frequency of road inputs and automatically adjusting damping in real time—no manual input required. Whether you're rolling over a sharp crack in the pavement or absorbing a long, rolling swell, the shocks respond with the appropriate damping force for a consistently smooth and controlled ride.

Key Features:

• Frequency Sensing Technology (FST) — dynamically adjusts damping based on bump frequency for superior ride quality
• Deflective disc valving — provides precise, progressive damping response
• Hand-adjustable spring pre-load — easily dial in your ride without special tools
• Progressive rate springs — offer a compliant feel over small bumps while resisting bottoming under heavy loads
• High-pressure gas charge — eliminates fade and delivers consistent performance mile after mile
• Sold in pairs — complete front-to-back replacement set
• Lifetime Limited Warranty — backed by Progressive Suspension's long-standing quality guarantee

The 444-4067C shocks are engineered as a direct-fit upgrade for compatible Harley-Davidson models, delivering a noticeable improvement in both comfort and handling over stock suspension components.