Legend Revo Arc Piggyback Coil Suspension 13" Standard Shocks Harley 91 17 Dyna "Street Light Shining With Moody Skies" by Stocksy Contributor "Rob And. Brand New Part # 1310 1890 Legend Suspension 13" Heavy Duty REVO ARC Piggyback Coil Suspension Fits: Harley 1991 2017 Dyna Models Available in Black Type III hard coat anodize REVO coils provide improved plush ride quality, control and resistance to bottoming out REVOs extended coil length has larger sweet spot without increasing overall shock length Allows minimal pre load adjustment by hand when changing between riders weights or loads Adjusts by hand, no tools needed Available in 13 and 14, standard or heavy duty applications Easy installation and alignment, provided by spherical bearings on both top and bottom 35 mm monotube construction Deflective disc valve stacks Balanced matched piston and base valve design specific for these motorcycle applications Low friction sealing system and PTFE based sliding bearings for improved performance and feel Seven external knob adjustments allow fine tuning of rebound Seven external knob adjustments allow fine tuning of compression Provides optimum rebound and compression performance for any given rider weight, personal ride quality preference or personal riding style Nitrogen gas bladder design allows ultra fast response and stiction free movement Light to heavy riders can fine tune ride preference Aggressive to casual riding styles can tune to desired quality or personal preference Lifetime warranty Made in the U. S. A. Heavy duty applications are recommended for 250 lb. + rider and passenger total weight. Also consider heavy duty if the majority of your riding is 2 up, stunt riding or aggressive riding style.