Progressive 444 Series shocks for Harley-Davidson feature Frequency Sensing Technology (FST) that dynamically adjusts damping as you ride over bumps of any size for a consistently smooth feel. Hand-adjustable preload and a choice of spring rates and finishes make these shocks adaptable to your load and riding style.
Features
- Frequency Sensing Technology (FST) auto-adjusts damping based on bump frequency
- Deflective disc valving for progressive damping
- Hand-adjustable spring preload — no special tool required
- Available in standard or heavy-duty spring rates
- Black or chrome finish options
- Made in USA with Limited Lifetime Warranty
Specifications
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Brand: Progressive
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Manufacturer Part #: 444-4066B
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Weight: 7.7 lb per pair
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Category: Suspension / Shocks and Struts
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Finish Options: Black or Chrome
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WARNING: Cancer and Reproductive Harm — California Prop 65. www.P65Warnings.ca.gov
Fitment
Fits Harley-Davidson models. Verify your specific year and model before ordering, as shock length and mounting points vary by platform.
Frequently Asked Questions
What is Frequency Sensing Technology and how does it work?
FST senses bump frequency and automatically routes oil through internal ports to adjust damping — small bumps get softer response, big hits get firmer support, all without rider input.
Do I need a special tool to adjust preload?
No — the threaded top cap allows hand adjustment for spring preload tuning. No wrench or special tool needed.
Can I choose between standard and heavy-duty spring rates?
Yes — Progressive offers both configurations. Heavy-duty rates support heavier loads or two-up riding. Choose based on your typical load.
Are these street-legal and DOT-approved?
Yes — Progressive 444 shocks are street-legal for on-road use on Harley-Davidson motorcycles.
What warranty comes with these shocks?
Limited Lifetime Warranty. Coverage details and exclusions are on Progressive's website.
California Proposition 65 Warning
WARNING: Cancer and Reproductive Harm — California Prop 65 (Y). www.P65Warnings.ca.gov