Progressive Suspension claims these are the most adjustable shock in the V-Twin market. They feature complete adjustability with a 0.4" adjustable height eyelet, rebound damping adjustment, High & Low Speed compression damping adjustment via easily accessible knobs, and threaded hand adjustable spring preload. They also feature 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. Shocks come with brackets to install the remote reservoirs in front of hard shell luggage. Brackets to install the reservoirs on the top rear fender strut covers on 2009 and later Touring are available as an accessory. Shocks with Heavy-Duty springs are recommended for riders with a weight of more than 110kg or for those who ride with a passenger most of the time. Every shock is hand-built, tuned and dyno tested. Engineered for aggressive sport inspired riders, the 990 sets the mark for excellence on your V-Twin motorcycle.