Progressive Suspension 444-4021B Heavy-Duty Rear Shock 13.5" Black

The Progressive Suspension 444-4021B is a premium heavy-duty rear shock featuring patented Frequency Sensing Technology (FST), designed specifically for Harley-Davidson touring motorcycles. This breakthrough design features FST's unique ability to dynamically adjust damping as you ride, automatically sensing bump frequency and adjusting compression to deliver superior ride quality on any road surface.

Key Features:

• 13.5-inch length with steel construction and black powdercoat finish
• Progressive rate spring with 105/150 lbs/in dual spring rate
• Deflective disc valving with hand-adjustable spring preload (no special tools required)
• High-pressure gas charged monotube internal design for consistent performance
• Eyelet-style upper and lower mounts with polyurethane bushings
• Heavy-duty configuration recommended for riders 250+ lbs or bikes operating at or near maximum load rating over 50% of the time

Unlike standard twin-tube shocks, the 444 Series monotube design keeps fluid less aerated and cools it much faster, ensuring consistent damping performance during extended rides. Sold as a pair with all mounting hardware included. Extended length: 13.50 inches, Collapsed length: 10.10 inches, Travel: 3.40 inches.