FOX FORK SPRING UPGRADES substantially improve the handling characteristics of your Harley Bagger or Dyna by correcting the spring rates and geometry of your motorcycle to perform when needed. We utilize straight rate high quality springs that are available in three different options so that you can further fine tune your ride. Our spring kits provide consistent and predictable comfort and feedback that removes the harshness of the road and holds the motorcycle up in the stroke when cornering or braking. Coupled with our FOX Street Performance rear shocks feel the difference of how your V-Twin should handle the road. Upgrade kit comes complete with a set of springs, exact length spacers needed and instructions for how to install.