Progressive Suspension has focused exclusively on American V-twin suspension since 1982, and its Monotube fork cartridges and 400/970/970G shock series are among the most common upgrades on baggers and Softails. For most riders the stock rear shock is the single worst part on the bike — this is the fix.
Transform your Harley-Davidson's front suspension with a Progressive Fork Cartridge Kit. This comprehensive upgrade replaces all OEM fork internals, delivering a significant improvement in handling, stability, and braking performance. Experience a more controlled and confident ride, whether you're cruising or pushing the limits.
Why riders pick this
Replaces all OEM fork internals for a complete upgrade
Gas-charged monotube damper cartridges for consistent performance
Custom-tuned fork springs in stock and lowered versions
Reduces front brake dive and improves stability
Enhances cornering and bottoming control
The Progressive Fork Cartridge Kit completely revamps your motorcycle's front end by replacing the stock components with advanced gas-charged monotube damper cartridges and custom-tuned fork springs. This engineered solution is designed to eliminate common complaints like excessive brake dive and vague front-end feel, providing a plush yet controlled ride across various road conditions.
Enhanced Control and Stability
Gas-charged monotube damper cartridges provide consistent damping
Custom-tuned fork springs available for stock and lowered ride heights
Reduces front brake dive for more stable stopping power
Improves front-end stability and cornering precision
Offers better bottoming control on rough roads
Dial In Your Ride
Whether you prefer the factory ride height or a lowered stance, this kit offers options to match your setup. The improved damping and spring rates work together to give you a more predictable and responsive front end, making every ride more enjoyable and confidence-inspiring. Consult your service manual or a professional for installation, ensuring proper setup for your specific Harley-Davidson model.
Specifications
Brand: Progressive
Manufacturer Part #: 31-4011
Category: Suspension / Fork Cartridge Kits
Weight: 12.7 lb
WARNING: Cancer and Reproductive Harm — California Prop 65. www.P65Warnings.ca.gov
Common questions
Do I need to replace the entire fork, or just the internals?
Just the internals — this kit replaces damper cartridges and springs while reusing your existing fork tubes and sliders.
Will this reduce my front brake dive?
Yes, the engineered design of these cartridges and springs is specifically intended to reduce front brake dive, improving stability during braking.
Is this kit available for a lowered ride height?
Yes, Progressive Fork Cartridge Kits are available in both stock and lowered ride-height versions to suit your preferred setup.
Ordering from Vtwinbikers
Brand new, sourced through authorized US distribution — never used, never grey-market.
Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
BRAND
Progressive
TYPE
Fork Cartridge Kits
SKU
T14-669283
WEIGHT
12.7 lb
Please contact us to confirm fitment for your specific motorcycle, or check the product title for compatibility notes.
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YOUR RATING
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✓ VERIFIED
Jun 29, 2014
The Feel is Greatly Improved
I replaced the the front and rear shocks on my 2013 Iron 883 and these both completely changed the feel of my bike! If you are going to do one upgrade on your Iron, replace both the front and rear shocks with Progressives. I could ride over a pothole the size of a moon crater and not even have to stand up with the 13" 444s. These fork cartridges dramatically improve the cornering and handling. I can't recommended these highly enough!
✓ VERIFIED
Apr 5, 2015
Super happy with these shocks
My ride: 2007 HD Sportster XL883L. The most critical test, an old set of train tracks halfway up a hill near my house. The grade goes level suddenly, has deep pot holes, really rough. Normally I bottom out hard. Went over that same spot after the Monotube fork kit was installed and the difference was amazing. It was like a different set of tracks. I love it when I spend the bucks and you know right away it was money well worth spent.
✓ VERIFIED
Feb 4, 2019
Awesome improvement
03 Ultra. Now it matches my Ohlins in the read. Great improvement over stock. No dive. Suspension is doing the work not my skeleton!
✓ VERIFIED
Jul 5, 2023
LOOK NO FURTHER
Installed in a 2001 Heritage Softail.<br />Top Shelf item. Easy to install. Made a world of difference in the handling of the motorcycle - braking, cornering, and overall ride. A life time guarantee to boot.
Progressive Fork Cartridge Kit - ...
$632.95
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