What makes these shocks a 'progressive rate' type?

Progressive rate springs have coils that are closer together at one end and farther apart at the other. This design allows the spring to react differently to small bumps versus larger impacts, offering a more comfortable ride over varied road conditions.

Can I adjust the ride height or stiffness of these shocks?

Yes, these shocks feature a five-position cam-style preload adjuster. This allows you to change the spring tension to fine-tune the suspension's stiffness and how it responds to your weight and riding style.

What is the benefit of the nitrogen charge in these shocks?

The high-pressure nitrogen charge helps prevent the oil inside the shock from foaming under heavy use. This ensures consistent damping performance, even during extended rides or when carrying heavier loads.

Specifications

Brand: Progressive
Part #: 412-4021B
UPC: 412-4021B

Progressive Harley 412 Series Shocks 13.5in - Black

Name: Progressive Harley 412 Series Shocks 13.5in - Black
Brand: Progressive
SKU: progressive-progressive-harley-412-series-shocks-13-5in-black-t14-669145
Price: 379.95 USD
Availability: BackOrder

$379.95

On Backorder — Expected to ship by May 21, 2026

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

Key Features

Fits 1980-2005 Harley-Davidson FLHS, FLHT, FLHTC, FLHTCU, FLT, FLTR, and FLHR models.
Doublewall steel body construction for durability.
Nitrogen charged with multi-stage velocity sensitive valving for consistent damping.
Five-position cam style preload adjuster allows for ride customization.
Progressive rate springs in black finish for improved ride quality.
13.5-inch length for a specific stance and travel.

Secure CheckoutFast Shipping631-982-0042

Will this fit your vehicle?

About this part

Product Details

Progressive is known for suspension components that offer a solid improvement over stock, and their 412 Series shocks are a popular choice for riders looking for better performance without breaking the bank. These 13.5-inch black shocks are designed to fit a wide range of Harley-Davidson motorcycles, including models like the Road King, Electra Glide, and Road Glide, providing a noticeable upgrade to your ride's handling and comfort.

The doublewall steel body construction is built to last, housing a nitrogen-charged damping system with multi-stage velocity-sensitive valving. This setup ensures smooth and consistent damping, whether you're cruising down the highway or navigating rougher roads. You can also fine-tune your ride using the five-position cam-style preload adjuster, allowing you to dial in the suspension to match your riding style and load, from a lighter rider to a heavier load.

These shocks come with progressive rate springs in a black finish, complementing the black damper body for a clean look. If you're looking to improve your motorcycle's suspension performance with a well-built and adjustable shock, the Progressive 412 Series is a solid option.