Progressive Monotube Fork Cartridge Kit For Harley Sportster 2007-2015

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Progressive Suspension Monotube Fork Cartridge Kit For Harley Sportster

True high-performance front suspension has finally made its way to HD. Progressive's state-of-the-art Monotube Fork Kit represents the pinnacle of front end handling. High performance specialty components replace the sloppy open bath damping found in HD forks. The kit features a set of gas charged monotube dampers and a set of custom tuned fork springs so you can convert your bike to cartridge forks whether you have dual damper rod forks or a damper rod/cartridge setup.


  • Complete fork internal replacement kit
  • Improved resistance to front brake dive, front end stability & cornering traits, and better avoidance of "bottoming out"
  • Made in USA
  • Progressive spring rate
  • High-quality chrome-silicon wire
  • Precision wound

Note: Does not include Allen key. 

4.8 / 5
Bang For The Buck
5 / 5

Fitment Notes & Exceptions

  • Changing ride height can potentially change many carefully-engineered attributes of your bike, including trail and mechanical trail
  • A change in ride height at one end of the vehicle usually will require a change at the other end
  • Prior to purchasing front-end components that are different than your OEM length, please verify that wheel and suspension travel can be altered without causing clearance issues - common interference spots include triple trees, fenders, frame, and of course, the ground
This Product Fits:
Harley Davidson
Sportster Forty-Eight XL1200X 20102015
Sportster Iron XL883N 20092015
Sportster Low/SuperLow XL883L 2007, 2008, 2009, 2010
Sportster Nightster XL1200N 20072012
Product Style RevZilla Item # Manufacturer Product # Availability
2" Drop Kit 903034 31-2518 In Stock: Ships within 24 hours
Stock Height Kit 903017 31-2515 In Stock: Ships within 24 hours


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4.8 / 5.0
4 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Bang For The Buck
4.5 / 5
5.0 / 5
4.0 / 5
Ease Of Install
3.0 / 5
Fit & Finish
5.0 / 5
5.0 / 5
Bang For The Buck
5 / 5
Top Notch!
Best thing I've bought for my 15 iron sporty yet!

Stock suspension is horrible on these bikes from the factory. I did the 412's in the rear at 13" and immediatley the front suspension weakness showed even more. I decided to spend the extra coin on the cartridge kit and I'm SOOOO glad I did.

I was having alot of wheel drift problems on the highway and other issues with the front end handling. This kit fixed EVERYTHING. The bike is so planted now on the road, world of a difference. Buy the kit and don't look back!

Best of all, no need to remove the forks to install on a sporty!
August 17, 2015
Bang For The Buck
5 / 5
5 / 5
4 / 5
Ease Of Install
3 / 5
Fit & Finish
5 / 5
5 / 5
Smooth ride
My hometown has some of the worst streets you've ever seen. I installed these and my ride quality has improved dramatically. I'm really impressed with these. I've paired this kit with progressive 444 shocks. I've adjusted the rear shocks with the proper sag, as suggested in a video by progressive. Along with a good seat, I've really improved the overall ride and handling of my 08 1200N. Install time was about 5 hours. This was time and money well spent.
October 7, 2016
10 months ago
2008 Harley Davidson Sportster Nightster XL1200N
Bang For The Buck
4 / 5
Excellent upgrade to compliment new shocks.
These monoshocks came highly recommended when I was looking to upgrade the forks and installing new shocks. Im not 100% sure that this made the front suspension more comfortable but it definitely improved the handling. I feel like my bike can easily slice through corners and doesnt dive quite as easily when getting on the brakes. Installation was a bit challenging and I recommend using a press or a buddy to compress the shock.
April 21, 2016
2013 Harley Davidson Sportster Iron XL883N
Bang For The Buck
4 / 5
2014 XL883N (Iron 883) Review
Review from a 5'-6" 145lbs rider
Miles ridden with monotube kit: ~800 miles
Rear suspension: Progressive Suspension 13" 412 series

With my weight and rear suspension the recommended 6 pre-load spacers gave me 1/8 inch of static sag!! 5 spacers gave me 1/2 inch of static sag. 4 spacer gave me 3/4 inch static sag. So after taking apart my front fork tubes 3 times I finally got the static sag that I'm happy with.

I can feel the monotube kit working over bumps, and is real nice vs stock.

-pre-load is adjustable
-improvement over stock
-improvement over drop in springs?
-no more fork oil changes or leaks

-recommended pre-load is for heavy riders
-must take off the fork tubes to adjust pre-load
-fork tube cap is part of the damper tube assembly, so will not work with a separate pre-load fork cap for fine tuning

overall I'm very happy about this upgrade and would do it again. Also let me get real good at taking apart the front tire, brakes, and fork tubes.
June 7, 2016
1 year ago
2014 Harley Davidson Sportster Iron XL883N
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