Progressive Suspension 444-4066C FST Rear Shock Absorbers 11.5in Chrome Standard Pair

The Progressive Suspension 444-4066C rear shock absorbers represent a major leap forward from the brand's legendary 440 Series, introducing a proprietary Frequency Sensing Technology (FST) — a patented system that dynamically adjusts damping in real time as you ride. Whether you're rolling over small road imperfections or hitting larger bumps, the shock automatically distributes oil through the appropriate internal ports to soak up the impact and deliver a consistently smooth, controlled ride.

Key Features:

• Frequency Sensing Technology (FST): Senses bump frequency and automatically adjusts damping for superior ride quality on any road surface
• Deflective disc valving for precise, responsive damping performance
• Top-mount threaded preload adjuster with index marks — fine-tune spring preload by hand with a simple twist, no special tools required
• Progressive rate springs provide a supple ride at low loads that firms up progressively under heavier loads
• High-pressure gas charged for consistent, fade-free performance
• 11.5-inch eye-to-eye length with chrome finish and standard spring rate
• Hand-built, tuned, and dyno-tested at the Progressive Suspension factory in the USA
• Sold as a pair
• Limited Lifetime Warranty

The 444-4066C shocks are available in a standard spring rate configuration, with a heavy-duty option also offered by Progressive Suspension for riders at or near maximum load capacity. The chrome finish and 11.5-inch length make these an ideal direct replacement or performance upgrade for a wide range of twin-shock motorcycles.