Progressive Monotube Fork Cartridge Kit For Harley Sportster 2005-2015

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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
5 / 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 Custom XL1200C 2012, 2013, 2014, 2015
Sportster Low/SuperLow XL883L 20052006, 20112015
Sportster Low XL1200L 2007, 2008, 2009, 2010, 2011
Product Style RevZilla Item # Manufacturer Product # Availability
2" Drop Kit 903033 31-2517 In Stock: Ships within 24 hours
Stock Height Kit 903016 31-2514 In Stock: Ships within 24 hours


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5.0 / 5.0
2 Reviews
5 Stars
4 Stars
3 Stars
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1 Star
Bang For The Buck
5.0 / 5
Bang For The Buck
5 / 5
Very pleased
These are definitely worth every penny. Very firm and stable ride, causes the bike to handle quickly and reduces the wallowing feel when in turns. Soaks up bumps and keeps the wheel planted. The increased handling inspires a great deal of confidence. One of the best purchases I've made for the bike.

Installation notes: Make sure to buy a long 6mm hex socket for the bolt in the bottom of the fork. Those few dollars will make your life easier. The Harley manual suggests 30-35 ft. lb. of torque on the fork retaining bolts on the triple tree for my model. This proved to be a bit more than the bolt heads could handle.
March 23, 2016
2012 Harley Davidson Sportster Custom XL1200C
Bang For The Buck
5 / 5
Great performance; not compatible with adjusters
I bought Progressive's Monotube Kit for my 2014 HD 1200 Custom and I couldn't be more impressed. Before, the stock suspension seemed like it worked exactly wrong: I could feel even little bumps in the road hit hard, yet under heavy braking I would get severe dive. Leaning on the front end would easily compress it substantially.

Now I find that the ride is both more comfortable and focused. Brake dive is decreased, and the suspension feels much more responsive in the corners.

The only disappointment I have with this product is the fact that it is not compatible with preload adjusters. I bought a set of RSD's Misano adjusters thinking they would look trick and also enable me to fine tune the suspension. Unfortunately, the tops of the monotubes are not replaceable. Still if you're debating whether to choose one over the other, go with the monotubes. They're great.
June 3, 2014
2014 Harley Davidson Sportster 1200 Custom XL1200C
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