Progressive Suspension 444-4059B Black 11.5" Rear Shock with FST Technology

The Progressive Suspension 444 Series Shock represents a breakthrough in motorcycle suspension technology with patented Frequency Sensing Technology (FST). This advanced system dynamically adjusts damping as you ride, sensing bump frequency and automatically distributing oil through precisely engineered ports to deliver superior ride quality whether you're encountering small ripples or major road imperfections.

Key Features:

• Patented Frequency Sensing Technology (FST) for automatic damping adjustment
• 11.5-inch extended length with 140/180 lbs/in progressive rate spring
• Deflective disc valving for high-level control without harshness
• Top-mount threaded preload adjuster - hand adjustable, no special tools needed
• High-pressure gas charged for consistent performance and reduced fade
• Black powdercoat finish with machined billet aluminum end caps
• Standard weight configuration (suitable for riders up to 250 lbs)
• Hand-built, tuned, and dyno tested for quality assurance

The 444 Series shocks feature progressively wound springs that deliver a plush ride during normal cruising while maintaining firm control during aggressive cornering. The innovative monotube design keeps fluid cooler and less aerated compared to traditional twin-tube shocks. Each shock is manufactured in the USA and backed by Progressive Suspension's Limited Lifetime Warranty. Sold as a pair for Harley-Davidson touring motorcycles.