Progressive Suspension 444-4066B FST Rear Shock Absorbers Heavy Duty Big Mile Riders Black

The Progressive Suspension 444-4066B rear shocks represent a major leap forward in motorcycle suspension technology, introducing the brand's proprietary Frequency Sensing Technology (FST). Building on more than a decade of success with the road-proven 440 Series, Progressive Suspension engineered these shocks to dynamically adjust damping in real time — sensing the frequency of each bump and automatically routing oil through the appropriate ports to absorb the impact and deliver a consistently smooth, comfortable ride.

Key Features:

• Frequency Sensing Technology (FST): Patented system that dynamically adjusts damping based on bump frequency for superior ride quality across all road conditions
• Deflective Disc Valving: Precise oil flow control for responsive, predictable damping performance
• Top-Mount Threaded Preload Adjuster: Hand-adjustable spring preload with a simple twist of the cap — no special tools required
• Progressive Rate Springs: Provide a compliant ride over small bumps while delivering firm support under heavier loads
• High-Pressure Gas Charged: Ensures consistent damping performance and resistance to fade
• Machined Billet Aluminum End Caps: Durable, precision-crafted construction for long-term reliability
• Black Finish: Aggressive, clean styling to complement a wide range of motorcycle aesthetics
• Sold in Pairs: Complete rear suspension replacement set
• Hand-Built, Tuned & Dyno Tested: Every shock is individually built and verified at the factory
• Made in USA with a Limited Lifetime Warranty

The 444 Series shocks are available in Standard Weight and Heavy Duty (250+ lbs.) configurations, making them an ideal upgrade for solo riders and those who frequently ride two-up or with additional load. Designed as a direct bolt-on replacement, installation is straightforward with no special tools required for spring preload adjustment.