What is Frequency Sensing Technology (FST)?

Frequency Sensing Technology (FST) is a patented system that allows the shocks to automatically adjust their damping based on the frequency of bumps encountered. This means the shocks can adapt in real-time to provide a more comfortable and controlled ride over various road surfaces.

How do I adjust the spring preload on these shocks?

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

What is the warranty on these Progressive shocks?

These Progressive 444 Series Shocks come with a Limited Lifetime Warranty. They are also manufactured in the USA, reflecting a commitment to quality and durability.

Specifications

Brand: Progressive
Part #: 444-4039B
UPC: 444-4039B

Progressive Harley 444 Series Shocks 13.0in - Black

Name: Progressive Harley 444 Series Shocks 13.0in - Black
Brand: Progressive
SKU: progressive-progressive-harley-444-series-shocks-13-0in-black-t14-669229
Price: 860.95 USD
Availability: BackOrder

$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 13.0in - Black. Features Frequency Sensing Technology for an improved, comfortable ride across various road conditions.

Key Features

Fits Harley-Davidson Dyna models including FXD, FXDB, FXDC, FXDF, FXDL, FXDLS, FXDWG, FXDX, and FXDXT.
Features patented Frequency Sensing Technology (FST) that automatically adjusts damping for improved ride quality.
Progressive rate spring offers a comfortable initial response that adapts to load.
Top mount threaded preload adjuster allows for easy, tool-free fine-tuning.
Deflective disc valving ensures consistent and controlled damping.
Available in standard or heavy-duty spring rates to suit rider weight.

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About this part

Product Details

If you're looking to give your Harley-Davidson Dyna a more comfortable and controlled ride, these 13-inch Progressive 444 Series Shocks in black are a solid option. Designed to fit a range of Dyna models, including the FXD Dyna Super Glide, FXDB Street Bob, and FXDWG Dyna Wide Glide, these shocks use advanced technology to adapt to the road as you ride. They're a significant upgrade for anyone who spends a lot of time in the saddle and wants to reduce fatigue from road imperfections.

What sets these shocks apart is their patented Frequency Sensing Technology (FST). This unique system automatically adjusts the damping based on the frequency of bumps it encounters. Whether you're dealing with small road vibrations or larger impacts, the shock's internal ports distribute oil accordingly to soak up the hit. This means you get a smoother, more comfortable ride without sacrificing control. The progressive rate spring also contributes to this, offering a softer initial response that stiffens as needed under load. Plus, the top-mounted threaded preload adjuster lets you easily fine-tune the suspension by hand, no special tools required, to match your riding style or load.

These shocks are well-built in the USA and come with a limited lifetime warranty, reflecting Progressive's confidence in their durability. You can choose between standard or heavy-duty spring rates depending on your typical riding weight, and the black finish offers a clean, classic look. If you're rebuilding the rear suspension on your Dyna, these shocks are a popular choice for their blend of comfort, adjustability, and advanced damping technology.