412 Series, 12.6in. Standard Spring Rate Rear Shock Absorbers - Black. Fits Dyna 1991-2017. - Progressive Suspension Exhaust Flanges & Associated * Avoid overtightened primary chain

* Avoid overtightened primary chain engine issues

most comfortable

giving riders confidence whether cruising city streets

unlocking both horsepower and torque

Simply replace the factory ECM and oxygen sensors

412 Series, 12.6in. Standard Spring Rate Rear Shock Absorbers - Black. Fits Dyna 1991-2017. - Progressive Suspension Exhaust Flanges & Associated * Avoid overtightened primary chainFeatures & Benefits: * 412 Series Shock. * Best value shock on the market today. * Simple, durable design will be an improvement over the Original. * Double wall steel body construction. * Nitrogen charged, multi staged velocity sensitive valving. * Smooth, consistent damping. * Multi position cam style preload adjuster. * Progressively wound Spring. Tech Tips: * Standard Spring Rates are recommended for riders that weigh under 110kg. * Heavy Duty