Progressive Suspension 444-4002B 444 Series 13" Rear Shock Black

The Progressive Suspension 444 Series represents the pinnacle of motorcycle suspension technology for Harley-Davidson applications. These premium 13-inch rear shocks feature the revolutionary Frequency Sensing Technology (FST), a patented innovation that dynamically adjusts damping as you ride to deliver superior performance on any road surface.

Advanced Frequency Sensing Technology:

FST works by sensing the frequency of bumps and automatically adjusting damping accordingly. Clever ports within each shock distribute oil precisely to absorb impacts both large and small, ensuring an exceptionally smooth and controlled ride. This technology separates wheel movement from chassis movement, providing consistent performance whether you're cruising highways or carving canyon roads.

Key Features:

• 13.0-inch extended length with standard duty spring rate (90/130 lbs/in)
• High-pressure gas charged for consistent, fade-free performance
• Progressive rate springs that deliver plush comfort during normal riding yet firm up when pushed hard
• Hand-adjustable spring preload with top-mount threaded adjuster—no special tools required
• Deflective disc valving ensures high-level control without harshness
• Steel construction with black powdercoat finish
• Machined billet aluminum end caps
• Hand-built, tuned, and dyno-tested in the USA
• Sold in pairs
• Limited Lifetime Warranty

Progressive 444 Series shocks are designed for riders who demand the best. The standard duty configuration is suitable for riders up to 250 lbs and bikes operating below maximum load rating most of the time. These shocks improve handling, comfort, and overall ride quality while maintaining the classic look of your motorcycle.