After more than a decade of ruling the roads with Progressive’s road proven 440 Series shocks, they’ve unveiled another breakthrough design. Dubbed Frequency Sensing Technology (FST) for its unique ability to dynamically adjust damping as you ride. The result is superior performance no matter the road conditions. A top mount threaded preload adjuster allows for fine tuning with a simple twist of the cap.
Uses FST (Frequency Sensing Technology); allows the shocks to sense the frequency of a bump and automatically adjust damping for superior ride quality
Deflective disc valving
Special tools no longer needed to adjust, spring pre-load can be adjusted by hand
High-pressure gas charged with a progressive rate spring creates a consistent performance
Standard or heavy duty spring rate with a black or chrome finish
