The Progressive 990 Series Piggyback Shocks are the most adjustable shocks available in the V-Twin market, with extreme adjustability at your fingertips. These shocks have a 0.4” adjustable height eyelet and rebound damping adjustment, as well as High & Low-Speed compression damping that can be adjusted via easily accessible knobs on the side of the shock. On top of that, these shocks feature a high-pressure monotube design with deflective disc damping routed through two unique circuits to deliver a consistently smooth ride through the damper stroke, giving you increased performance and exceptional stability. Each Progressive 990 Series Piggyback Shock is hand-built, tuned, and dyno-tested for maximum excellence and reliability so you know you’re making an informed decision in investing in superior quality shocks for your motorcycle.