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Progressive Suspension has combined their road smoothing Frequency Sensing Technology (FST) damper with a progressive rate spring to create a state of the art fork cartridge kit.
What is F.S.T.?
Our proprietary patented technology that has the unique ability to dynamically adjust damping as you ride. What this means is whether you`re hitting the small or big bumps in the road, the Monotube distributes oil through ports accordingly to soak up the hit making for an ultimately comfortable ride.
- Frequency sensing technology
- Features adjustable preload
- Stock height or lowered
- Front brake dive resistance
- Improved front end stability
- Improved bottoming control
- Improved cornering
- OEM # 31-4009
Note
Fits Harley-Davidson Softail 18-later (excl. FXFB/S, FLSB, FXDR, FXLRS/T)
