The most adjustable shock in the V-Twin market| the 990 Sport Series Shock featuring complete adjustability with a 0.4 adjustable height eyelet| rebound damping adjustment| High and Low Speed compression damping adjustment via easily accessible knobs| and threaded hand adjustable spring preload. The 990 features a high-pressure monotube with deflective disc damping routed through two unique circuits delivering a consistent feel through the damper stroke for improved performance and stability. The new and improved engineered jounce bumper features a captured design to help smooth and control bottoming. Every shock is hand-built| tuned and dyno tested in Progressive's facility and come with a lifetime warranty. Engineered for aggressive sport inspired riders| the 990 sets the mark for excellence on your V-Twin motorcycle.