What is Frequency Sensing Technology (FST)?

Frequency Sensing Technology (FST) is a patented system that allows the shock absorber to sense the frequency of bumps. It automatically adjusts the damping rate by distributing oil through specific ports to better absorb impacts, leading to an improved and more comfortable ride.

How do I adjust the preload on these shocks?

The 444 Series shocks feature a top-mounted threaded preload adjuster. You can easily adjust the spring preload by hand by simply twisting the cap, without the need for any special tools.

What are the different spring rate options?

These shocks are available in standard weight, heavy-duty (for riders 250 lbs and over), and super heavy duty (for touring models 350 lbs and over). Choosing the correct spring rate ensures optimal performance and comfort for your specific needs.

Progressive Harley 444 Series Shocks 13.5in - Black

Specifications

Brand: Progressive
Part #: 444-4021B
UPC: 444-4021B

Progressive Harley 444 Series Shocks 13.5in - Black

Name: Progressive Harley 444 Series Shocks 13.5in - Black
Brand: Progressive
Price: 860.95 USD
Availability: InStock

$860.95

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Progressive Harley 444 Series Shocks 13.5in - Black. Features Frequency Sensing Technology for an improved ride.

Key Features

Fits a wide range of Harley-Davidson motorcycles, including Road King, Electra Glide, and Street Glide models.
Patented Frequency Sensing Technology (FST) automatically adjusts damping for improved ride comfort.
Top-mounted threaded preload adjuster allows for easy, tool-free fine-tuning of suspension stiffness.
Features a progressive rate spring for better performance across varied road conditions.
Reflective disc valving ensures consistent damping performance.
Available in standard or heavy-duty spring rates to match rider weight.

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Will this fit your vehicle?

Product Details

The heart of the Progressive 444 Series Shocks is their patented Frequency Sensing Technology (FST). This advanced system allows the shocks to automatically adjust damping based on the frequency of bumps encountered on the road. Whether you're dealing with small road imperfections or larger impacts, the FST dynamically distributes oil through specific ports to absorb the hit, leading to a more comfortable and controlled ride. These shocks are designed to fit a wide range of Harley-Davidson models, including popular bikes like the Road King, Electra Glide, and Street Glide, offering a significant upgrade over stock suspension.

Beyond the FST, these 13.5-inch black shocks feature a top-mounted threaded preload adjuster. This allows you to easily fine-tune your suspension's stiffness by hand, without needing any special tools, to match your riding style or load. You can choose between standard or heavy-duty spring rates, and the shocks come with a progressive rate spring for improved performance across various conditions. The reflective disc valving further contributes to consistent damping performance. These shocks are well-built in the USA and come with a limited lifetime warranty, reflecting Progressive's confidence in their durability.

When installing these shocks, consider the different spring rate options available to best suit your typical riding weight. The black finish offers a clean, custom look that complements many Harley-Davidson aesthetics. This is a substantial upgrade for riders looking for a more comfortable and responsive suspension experience.