What is Frequency Sensing Technology (FST)?

Frequency Sensing Technology (FST) is a patented system that allows the shocks to sense the frequency of road impacts. It automatically adjusts the damping by distributing oil through different ports, helping to absorb both small and large bumps for a more comfortable ride.

Can I adjust the preload on these shocks?

Yes, the 444 Series shocks feature a top-mounted threaded preload adjuster. This allows you to easily fine-tune the suspension by hand, without the need for any special tools.

What are the different spring rate options available?

Progressive offers these shocks in standard weight, heavy-duty (for riders 250+ lbs), and Super Heavy Duty (for touring models 350+ lbs) configurations. Selecting the correct spring rate is important for optimal performance based on your riding weight.

Progressive Harley 444 Series Shocks 13.5in - Chrome

Specifications

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

Progressive Harley 444 Series Shocks 13.5in - Chrome

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

$860.95

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Progressive Harley 444 Series Shocks 13.5in - Chrome. Features patented Frequency Sensing Technology for an improved, comfortable ride.

Key Features

Fits a wide range of Harley-Davidson motorcycles including FLHR, FLHX, and FLTRX models.
Features patented Frequency Sensing Technology (FST) that automatically adjusts damping for improved ride quality.
Top mount threaded preload adjuster allows for easy, tool-free fine-tuning.
Includes a progressive rate spring and deflective disc valving for better performance.
Available in standard or heavy-duty spring rates and black or chrome finishes.
Built in the USA with a limited lifetime warranty.

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Will this fit your vehicle?

Product Details

The 13.5-inch Progressive 444 Series Shocks in chrome utilize a patented Frequency Sensing Technology (FST) that allows them to automatically adjust damping based on the frequency of road impacts. This means the shocks distribute oil through their ports differently whether you're encountering small road imperfections or larger bumps, working to soak up the hit for a more comfortable ride across a range of Harley-Davidson models, including the Road King, Street Glide, and Road Glide.

These shocks feature a top-mounted threaded preload adjuster, letting you fine-tune the suspension by hand without needing special tools. They also incorporate a progressive rate spring and a deflective disc valving system for improved performance. You can choose between standard or heavy-duty spring rates, and select a black or chrome finish to match your bike's style. The 444 Series is built in the USA and comes with a limited lifetime warranty, offering a solid option for riders looking to improve their motorcycle's handling and comfort.

For those carrying heavier loads or riding with a passenger, Progressive offers specific configurations like the Heavy-duty (250+ lbs.) and Super Heavy Duty (Touring Models only - 350+ lbs.) spring rates. Be sure to select the appropriate spring rate for your riding needs to get the most out of these well-built shocks.