What is Frequency Sensing Technology (FST)?

Frequency Sensing Technology (FST) is a patented system that allows the shocks to sense the frequency of bumps on the road. It automatically adjusts the damping by distributing oil through specific ports to absorb impacts, leading to a more comfortable and controlled ride.

Can I adjust the suspension for different loads or riding styles?

Yes, these shocks feature a top-mounted threaded preload adjuster. You can easily adjust the spring preload by hand, without needing any special tools, to fine-tune the suspension for your specific needs.

What is the difference between standard and heavy-duty spring rates?

The standard weight springs are suitable for average rider weights, while the heavy-duty springs are recommended for riders weighing 250 lbs or more, or for those carrying additional cargo. There is also a Super Heavy Duty option specifically for touring models over 350 lbs.

Progressive Harley 444 Series Shocks 13.0in - Chrome

Specifications

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

Progressive Harley 444 Series Shocks 13.0in - Chrome

Name: Progressive Harley 444 Series Shocks 13.0in - 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 13.0in - Chrome. Features Frequency Sensing Technology for an improved ride.

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 comfort and control.
Includes a progressive rate spring that adapts to road conditions.
Top mount threaded preload adjuster allows for easy, tool-free fine-tuning.
Deflective disc valving ensures consistent damping performance.
Available in standard or heavy-duty spring rates and black or chrome finishes.

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Will this fit your vehicle?

Product Details

You're getting a pair of Progressive 444 Series 13.0-inch shocks in a chrome finish. These are designed to fit a range of Harley-Davidson Dyna models, including popular bikes like the FXD Dyna Super Glide, FXDB Street Bob, and FXDWG Dyna Wide Glide. These shocks are built to handle the demands of the road, offering a significant upgrade over stock suspension components.

What really sets these shocks apart is their patented Frequency Sensing Technology (FST). This advanced system allows the shocks to automatically adjust damping based on the frequency of bumps encountered. Whether you're dealing with small road imperfections or larger impacts, the FST system intelligently distributes oil through its ports to absorb the hit, leading to a more comfortable and controlled ride. The shocks also feature a progressive rate spring, which means the spring rate changes as it's compressed, providing a softer initial feel that stiffens up as needed. Plus, you can easily fine-tune the spring preload by hand using the top-mounted threaded adjuster, no special tools required. This makes it simple to dial in the suspension for your specific riding style and load.

These 444 Series shocks are available in different configurations to suit your needs, including standard weight and heavy-duty spring rates, and this particular set comes in a striking chrome finish. They also incorporate a deflective disc valving system for consistent damping performance. Progressive Suspension backs these shocks with a limited lifetime warranty and they are made in the USA, giving you confidence in their durability and craftsmanship.