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Progressive Fork Springs For Harley 1984-1992

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Progressive Fork Springs For Harley

The 'Original' Progressive-rate fork springs soak up small road bumps, yet are firm enough to absorb the molar-rattlers. Spring rates have been chosen to reduce front end "dive" during braking, yet still provide excellent ride comfort. Progressive-rate fork springs have several advantages over straight rate springs. A progressive-rate spring has the advantage of a resistance to compression that rises as the spring is being compressed - it gets tougher to compress as it is compressed. The benefit of this is that the spring can be soft enough at the start of the travel to offer a "plush" ride, yet be firm enough at the end of the travel to soak up the big bumps.


  • Progressive spring rate
  • High-quality chrome-silicon wire
  • Precision wound
  • Made in USA


View Fitment Notes & Exceptions

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
  • Heavy Duty shocks are recommended for bikes operated at or near the OEM maximum load rating over 50% of the time
  • Prior to purchasing springs 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
Low Glide/Low Rider FXRS 1984, 1985, 1986, 1987
Sport Glide FXRT 19841992
Sport Glide Grand Touring FXRD 1986
Super Glide FXE 1985
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Progressive Fork Springs For Harley K/Sportster 1952-1985
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Product Style RevZilla Item # Manufacturer Product # Availability
35mm Tubes, Stock Length 899866 111120/11-1120 In Stock: Ships within 24 hours