What is Frequency Sensing Technology (FST)?

Frequency Sensing Technology (FST) is a patented system that allows the shock absorbers to automatically adjust their damping based on the frequency of the bumps encountered. This means the shocks can react differently to small road imperfections versus larger impacts, providing a more comfortable and controlled ride.

How do I adjust the spring preload on these shocks?

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

What are the different spring rate options available?

These shocks are offered in three configurations: Standard Weight for typical riders, Heavy-duty for riders and loads over 250 lbs, and Super Heavy Duty specifically for touring models carrying over 350 lbs.

Progressive Harley 444 Series Shocks 12.0in - Chrome

Specifications

Brand: Progressive
Part #: 444-4036C
UPC: 444-4036C

Progressive Harley 444 Series Shocks 12.0in - Chrome

Name: Progressive Harley 444 Series Shocks 12.0in - Chrome
Brand: Progressive
Price: 860.95 USD
Availability: InStock

$860.95

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Progressive Harley 444 Series Shocks 12.0in - Chrome. Features patented Frequency Sensing Technology for an improved, comfortable ride.

Key Features

Fits Harley-Davidson FXD Dyna Super Glide, FXDB Street Bob, FXDC Super Glide Custom, FXDF Fat Bob, FXDL Dyna Low Rider, FXDLS Low Rider S, FXDWG Dyna Wide Glide, FXDX Dyna Super Glide Sport, and FXDXT Dyna Super Glide T-Sport models.
Features patented Frequency Sensing Technology (FST) that automatically adjusts damping for improved ride comfort.
Includes a progressive rate spring and reflective disc valving for responsive damping.
Top mount threaded preload adjuster allows for tool-free fine-tuning of suspension.
Available in standard weight, heavy-duty (250+ lbs), and super heavy-duty (350+ lbs) spring rates.
This is the 12.0 inch length in a chrome finish.

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Will this fit your vehicle?

Product Details

When you're looking to improve the ride on your Harley-Davidson Dyna, these Progressive 444 Series Shocks are a solid option. What you get in this package are a pair of 12-inch chrome shocks, designed to fit a range of Harley-Davidson Dyna models like the Street Bob, Fat Bob, and Low Rider. These aren't just standard shocks; they incorporate Progressive's patented Frequency Sensing Technology (FST). This advanced system automatically adjusts the damping based on the frequency of bumps you hit, meaning it can soak up small road imperfections and larger impacts more effectively, leading to a more comfortable ride whether you're cruising around town or on a longer trip.

The construction here is well-built, featuring a progressive rate spring and a reflective disc valving system that works with the FST to manage oil flow for optimal damping. You also get a top-mounted threaded preload adjuster, which lets you fine-tune the suspension to your specific needs or load without needing any special tools – just a simple twist. These shocks are available in different configurations to match your riding style and weight, including standard weight, heavy-duty for riders over 250 lbs, and super heavy-duty for touring models over 350 lbs. This particular set is the 12-inch chrome version.

Installation is straightforward, as these are designed as direct replacements for your stock shocks. You'll want to consider which spring rate configuration best suits your typical riding load. They come with a limited lifetime warranty from Progressive, and they're made right here in the USA, giving you confidence in their durability and support.